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| author | Josh Blum <josh@joshknows.com> | 2010-01-22 11:56:55 -0800 |
|---|---|---|
| committer | Josh Blum <josh@joshknows.com> | 2010-01-22 11:56:55 -0800 |
| commit | 7bf8a6df381a667134b55701993c6770d32bc76b (patch) | |
| tree | 4a298fb5450f7277b5aaf5210740ae18f818c9aa /usrp2/control_lib/newfifo | |
| parent | 8f2c33eab9396185df259639082b7d1618585973 (diff) | |
| download | uhd-7bf8a6df381a667134b55701993c6770d32bc76b.tar.gz uhd-7bf8a6df381a667134b55701993c6770d32bc76b.tar.bz2 uhd-7bf8a6df381a667134b55701993c6770d32bc76b.zip | |
Moved usrp2 fpga files into usrp2 subdir.
Diffstat (limited to 'usrp2/control_lib/newfifo')
21 files changed, 7527 insertions, 0 deletions
diff --git a/usrp2/control_lib/newfifo/.gitignore b/usrp2/control_lib/newfifo/.gitignore new file mode 100644 index 000000000..cba7efc8e --- /dev/null +++ b/usrp2/control_lib/newfifo/.gitignore @@ -0,0 +1 @@ +a.out diff --git a/usrp2/control_lib/newfifo/buffer_int.v b/usrp2/control_lib/newfifo/buffer_int.v new file mode 100644 index 000000000..b45ed3532 --- /dev/null +++ b/usrp2/control_lib/newfifo/buffer_int.v @@ -0,0 +1,168 @@ + +// FIFO Interface to the 2K buffer RAMs +// Read port is read-acknowledge +// FIXME do we want to be able to interleave reads and writes? + +module buffer_int + #(parameter BUF_NUM = 0, + parameter BUF_SIZE = 9) + (// Control Interface + input clk, + input rst, + input [31:0] ctrl_word, + input go, + output done, + output error, + output idle, + output [1:0] flag, + + // Buffer Interface + output en_o, + output we_o, + output reg [BUF_SIZE-1:0] addr_o, + output [31:0] dat_to_buf, + input [31:0] dat_from_buf, + + // Write FIFO Interface + input [31:0] wr_data_i, + input [3:0] wr_flags_i, + input wr_ready_i, + output wr_ready_o, + + // Read FIFO Interface + output [31:0] rd_data_o, + output [3:0] rd_flags_o, + output rd_ready_o, + input rd_ready_i + ); + + reg [31:0] ctrl_reg; + reg go_reg; + + always @(posedge clk) + go_reg <= go; + + always @(posedge clk) + if(rst) + ctrl_reg <= 0; + else + if(go & (ctrl_word[31:28] == BUF_NUM)) + ctrl_reg <= ctrl_word; + + wire [BUF_SIZE-1:0] firstline = ctrl_reg[BUF_SIZE-1:0]; + wire [BUF_SIZE-1:0] lastline = ctrl_reg[2*BUF_SIZE-1:BUF_SIZE]; + + wire read = ctrl_reg[22]; + wire write = ctrl_reg[23]; + wire clear = ctrl_reg[24]; + //wire [2:0] port = ctrl_reg[27:25]; // Ignored in this block + //wire [3:0] buff_num = ctrl_reg[31:28]; // Ignored here ? + + localparam IDLE = 3'd0; + localparam PRE_READ = 3'd1; + localparam READING = 3'd2; + localparam WRITING = 3'd3; + localparam ERROR = 3'd4; + localparam DONE = 3'd5; + + reg [2:0] state; + reg rd_sop, rd_eop; + wire wr_sop, wr_eop, wr_error; + reg [1:0] rd_occ; + wire [1:0] wr_occ; + + always @(posedge clk) + if(rst) + begin + state <= IDLE; + rd_sop <= 0; + rd_eop <= 0; + rd_occ <= 0; + end + else + if(clear) + begin + state <= IDLE; + rd_sop <= 0; + rd_eop <= 0; + rd_occ <= 0; + end + else + case(state) + IDLE : + if(go_reg & read) + begin + addr_o <= firstline; + state <= PRE_READ; + end + else if(go_reg & write) + begin + addr_o <= firstline; + state <= WRITING; + end + + PRE_READ : + begin + state <= READING; + addr_o <= addr_o + 1; + rd_occ <= 2'b00; + rd_sop <= 1; + rd_eop <= 0; + end + + READING : + if(rd_ready_i) + begin + rd_sop <= 0; + addr_o <= addr_o + 1; + if(addr_o == lastline) + begin + rd_eop <= 1; + // FIXME assign occ here + rd_occ <= 0; + end + else + rd_eop <= 0; + if(rd_eop) + state <= DONE; + end + + WRITING : + begin + if(wr_ready_i) + begin + addr_o <= addr_o + 1; + if(wr_error) + begin + state <= ERROR; + // Save OCC flags here + end + else if((addr_o == lastline)||wr_eop) + state <= DONE; + end // if (wr_ready_i) + end // case: WRITING + + endcase // case(state) + + assign dat_to_buf = wr_data_i; + assign rd_data_o = dat_from_buf; + + assign rd_flags_o = { rd_occ[1:0], rd_eop, rd_sop }; + assign rd_ready_o = (state == READING); + + assign wr_sop = wr_flags_i[0]; + assign wr_eop = wr_flags_i[1]; + assign wr_occ = wr_flags_i[3:2]; + assign wr_error = wr_sop & wr_eop; + assign wr_ready_o = (state == WRITING); + + assign we_o = (state == WRITING); + //assign we_o = (state == WRITING) && wr_ready_i; // always write to avoid timing issue + + assign en_o = ~((state==READING)& ~rd_ready_i); // FIXME potential critical path + + assign done = (state == DONE); + assign error = (state == ERROR); + assign idle = (state == IDLE); + +endmodule // buffer_int diff --git a/usrp2/control_lib/newfifo/buffer_int_tb.v b/usrp2/control_lib/newfifo/buffer_int_tb.v new file mode 100644 index 000000000..df54dcc0b --- /dev/null +++ b/usrp2/control_lib/newfifo/buffer_int_tb.v @@ -0,0 +1,418 @@ + +module buffer_int_tb (); + + reg clk = 0; + reg rst = 1; + + initial #100 rst = 0; + always #5 clk = ~clk; + + wire en, we; + wire [8:0] addr; + wire [31:0] fifo2buf, buf2fifo; + + wire [31:0] rd_data_o; + wire [3:0] rd_flags_o; + wire rd_sop_o, rd_eop_o; + reg rd_error_i = 0, rd_read_i = 0; + + reg [31:0] wr_data_i = 0; + wire [3:0] wr_flags_i; + reg wr_eop_i = 0, wr_sop_i = 0; + reg wr_write_i = 0; + wire wr_ready_o, wr_full_o; + + reg clear = 0, write = 0, read = 0; + reg [8:0] firstline = 0, lastline = 0; + wire [3:0] step = 1; + wire [31:0] ctrl_word = {4'b0,3'b0,clear,write,read,step,lastline,firstline}; + reg go = 0; + wire done, error; + + assign wr_flags_i = {2'b00, wr_eop_i, wr_sop_i}; + assign rd_sop_o = rd_flags_o[0]; + assign rd_eop_o = rd_flags_o[1]; + + buffer_int buffer_int + (.clk(clk),.rst(rst), + .ctrl_word(ctrl_word),.go(go), + .done(done),.error(error), + + // Buffer Interface + .en_o(en),.we_o(we),.addr_o(addr), + .dat_to_buf(fifo2buf),.dat_from_buf(buf2fifo), + + // Write FIFO Interface + .wr_data_i(wr_data_i), .wr_flags_i(wr_flags_i), .wr_write_i(wr_write_i), .wr_ready_o(wr_ready_o), + + // Read FIFO Interface + .rd_data_o(rd_data_o), .rd_flags_o(rd_flags_o), .rd_ready_o(rd_ready_o), .rd_read_i(rd_read_i) + ); + + reg ram_en = 0, ram_we = 0; + reg [8:0] ram_addr = 0; + reg [31:0] ram_data = 0; + + ram_2port #(.DWIDTH(32),.AWIDTH(9)) ram_2port + (.clka(clk), .ena(ram_en), .wea(ram_we), .addra(ram_addr), .dia(ram_data), .doa(), + .clkb(clk), .enb(en), .web(we), .addrb(addr), .dib(fifo2buf), .dob(buf2fifo) ); + + initial + begin + @(negedge rst); + @(posedge clk); + FillRAM; + + ResetBuffer; + SetBufferRead(5,10); + $display("Testing full read, no wait states."); + while(!rd_sop_o) + @(posedge clk); + ReadLines(6,0); + repeat (10) + @(posedge clk); + + ResetBuffer; + SetBufferRead(5,10); + $display("Testing full read, 2 wait states."); + while(!rd_sop_o) + @(posedge clk); + ReadLines(6,2); + repeat (10) + @(posedge clk); + + ResetBuffer; + SetBufferRead(5,10); + $display("Testing partial read, 0 wait states, then nothing after last."); + while(!rd_sop_o) + @(posedge clk); + ReadLines(3,0); + repeat (10) + @(posedge clk); + + ResetBuffer; + SetBufferRead(5,10); + $display("Testing partial read, 0 wait states, then done at same time as last."); + while(!rd_sop_o) + @(posedge clk); + ReadLines(2,0); + ReadALine; + repeat (10) + @(posedge clk); + + ResetBuffer; + SetBufferRead(5,10); + $display("Testing partial read, 3 wait states, then error at same time as last."); + while(!rd_sop_o) + @(posedge clk); + ReadLines(2,3); + rd_error_i <= 1; + ReadALine; + rd_error_i <= 0; + repeat (10) + @(posedge clk); + + ResetBuffer; + SetBufferRead(500,511); + $display("Testing full read, to the end of the buffer."); + while(!rd_sop_o) + @(posedge clk); + ReadLines(12,0); + repeat (10) + @(posedge clk); + + ResetBuffer; + SetBufferRead(0,511); + $display("Testing full read, start to end of the buffer."); + while(!rd_sop_o) + @(posedge clk); + ReadLines(512,0); + repeat (10) + @(posedge clk); + + ResetBuffer; + SetBufferRead(505,3); + $display("Testing full read, wraparound"); + while(!rd_sop_o) + @(posedge clk); + ReadLines(11,0); + repeat (10) + @(posedge clk); + + ResetBuffer; + SetBufferWrite(10,15); + $display("Testing Full Write, no wait states"); + while(!wr_ready_o) + @(posedge clk); + WriteLines(6,0,72); + repeat (10) + @(posedge clk); + + ResetBuffer; + SetBufferWrite(18,23); + $display("Testing Full Write, 1 wait states"); + while(!wr_ready_o) + @(posedge clk); + WriteLines(6,1,101); + repeat (10) + @(posedge clk); + + ResetBuffer; + SetBufferWrite(27,40); + $display("Testing Partial Write, 0 wait states"); + while(!wr_ready_o) + @(posedge clk); + WriteLines(6,0,201); + repeat (10) + @(posedge clk); + + ResetBuffer; + SetBufferWrite(45,200); + $display("Testing Partial Write, 0 wait states, then done and write simultaneously"); + while(!wr_ready_o) + @(posedge clk); + wr_sop_i <= 1; wr_eop_i <= 0; + WriteLines(6,0,301); + wr_sop_i <= 0; wr_eop_i <= 1; + WriteALine(400); + wr_sop_i <= 0; wr_eop_i <= 0; + repeat (10) + @(posedge clk); + + ResetBuffer; + SetBufferWrite(55,200); + $display("Testing Partial Write, 0 wait states, then error"); + while(!wr_ready_o) + @(posedge clk); + WriteLines(6,0,501); + wr_sop_i <= 1; wr_eop_i <= 1; + WriteALine(400); + @(posedge clk); + repeat (10) + @(posedge clk); + wr_sop_i <= 0; wr_eop_i <= 0; + + ResetBuffer; + SetBufferRead(0,82); + $display("Testing read after all the writes"); + while(!rd_sop_o) + @(posedge clk); + ReadLines(83,0); + repeat (10) + @(posedge clk); + + ResetBuffer; + SetBufferWrite(508,4); + $display("Testing wraparound write"); + while(!wr_ready_o) + @(posedge clk); + WriteLines(9,0,601); + repeat (10) + @(posedge clk); + + ResetBuffer; + SetBufferRead(506,10); + $display("Reading wraparound write"); + while(!rd_sop_o) + @(posedge clk); + ReadLines(17,0); + repeat (10) + @(posedge clk); + + ResetBuffer; + SetBufferWrite(0,511); + $display("Testing Whole Buffer write"); + while(!wr_ready_o) + @(posedge clk); + WriteLines(512,0,1000); + repeat (10) + @(posedge clk); + + ResetBuffer; + SetBufferRead(0,511); + $display("Reading Whole Buffer write"); + while(!rd_sop_o) + @(posedge clk); + ReadLines(512,0); + repeat (10) + @(posedge clk); + + /* + ResetBuffer; + SetBufferWrite(5,10); + $display("Testing Write Too Many"); + while(!wr_ready_o) + @(posedge clk); + WriteLines(12,0,2000); + repeat (10) + @(posedge clk); + + ResetBuffer; + SetBufferRead(0,15); + $display("Reading back Write Too Many"); + while(!rd_sop_o) + @(posedge clk); + ReadLines(16,0); + repeat (10) + @(posedge clk); + */ + ResetBuffer; + SetBufferWrite(15,20); + $display("Testing Write One Less Than Full"); + while(!wr_ready_o) + @(posedge clk); + wr_sop_i <= 1; wr_eop_i <= 0; + WriteALine(400); + wr_sop_i <= 0; wr_eop_i <= 0; + WriteLines(3,0,2000); + wr_sop_i <= 0; wr_eop_i <= 1; + WriteALine(400); + wr_sop_i <= 0; wr_eop_i <= 0; + repeat (10) + @(posedge clk); + + ResetBuffer; + SetBufferRead(13,22); + $display("Reading back Write One Less Than Full"); + while(!rd_sop_o) + @(posedge clk); + ReadLines(10,0); + repeat (10) + @(posedge clk); + + ResetBuffer; + repeat(100) + @(posedge clk); + $finish; + end + + always @(posedge clk) + if(rd_read_i == 1'd1) + $display("READ Buffer %d, rd_sop_o %d, rd_eop_o %d", rd_data_o, rd_sop_o, rd_eop_o); + + always @(posedge clk) + if(wr_write_i == 1'd1) + $display("WRITE Buffer %d, wr_ready_o %d, wr_full_o %d", wr_data_i, wr_ready_o, wr_full_o); + + initial begin + $dumpfile("buffer_int_tb.lxt"); + $dumpvars(0,buffer_int_tb); + end + + task FillRAM; + begin + ram_addr <= 0; + ram_data <= 0; + @(posedge clk); + ram_en <= 1; + ram_we <= 1; + @(posedge clk); + repeat (511) + begin + ram_addr <= ram_addr + 1; + ram_data <= ram_data + 1; + ram_en <= 1; + ram_we <= 1; + @(posedge clk); + end + ram_en <= 0; + ram_we <= 0; + @(posedge clk); + $display("Filled the RAM"); + end + endtask // FillRAM + + task ResetBuffer; + begin + clear <= 1; read <= 0; write <= 0; + go <= 1; + @(posedge clk); + go <= 0; + @(posedge clk); + $display("Buffer Reset"); + end + endtask // ClearBuffer + + task SetBufferWrite; + input [8:0] start; + input [8:0] stop; + begin + clear <= 0; read <= 0; write <= 1; + firstline <= start; + lastline <= stop; + go <= 1; + @(posedge clk); + go <= 0; + @(posedge clk); + $display("Buffer Set for Write"); + end + endtask // SetBufferWrite + + task SetBufferRead; + input [8:0] start; + input [8:0] stop; + begin + clear <= 0; read <= 1; write <= 0; + firstline <= start; + lastline <= stop; + go <= 1; + @(posedge clk); + go <= 0; + @(posedge clk); + $display("Buffer Set for Read"); + end + endtask // SetBufferRead + + task ReadALine; + begin + while(~rd_ready_o) + @(posedge clk); + #1 rd_read_i <= 1; + @(posedge clk); + rd_read_i <= 0; + end + endtask // ReadALine + + task ReadLines; + input [9:0] lines; + input [7:0] wait_states; + begin + $display("Read Lines: Number %d, Wait States %d",lines,wait_states); + repeat (lines) + begin + ReadALine; + repeat (wait_states) + @(posedge clk); + end + end + endtask // ReadLines + + task WriteALine; + input [31:0] value; + begin + while(~wr_ready_o) + @(posedge clk); + #1 wr_write_i <= 1; + wr_data_i <= value; + @(posedge clk); + wr_write_i <= 0; + end + endtask // WriteALine + + task WriteLines; + input [9:0] lines; + input [7:0] wait_states; + input [31:0] value; + begin + $display("Write Lines: Number %d, Wait States %d",lines,wait_states); + repeat(lines) + begin + value <= value + 1; + WriteALine(value); + repeat(wait_states) + @(posedge clk); + end + end + endtask // WriteLines + +endmodule // buffer_int_tb diff --git a/usrp2/control_lib/newfifo/buffer_pool.v b/usrp2/control_lib/newfifo/buffer_pool.v new file mode 100644 index 000000000..41ac1deb3 --- /dev/null +++ b/usrp2/control_lib/newfifo/buffer_pool.v @@ -0,0 +1,283 @@ + +// Buffer pool. Contains 8 buffers, each 2K (512 by 32). Each buffer +// is a dual-ported RAM. Port A on each of them is indirectly connected +// to the wishbone bus by a bridge. Port B may be connected any one of the +// 8 (4 rd, 4 wr) FIFO-like streaming interaces, or disconnected. The wishbone bus +// provides access to all 8 buffers, and also controls the connections +// between the ports and the buffers, allocating them as needed. + +// wb_adr is 16 bits -- +// bits 13:11 select which buffer +// bits 10:2 select line in buffer +// bits 1:0 are unused (32-bit access only) + +// BUF_SIZE is in address lines (i.e. log2 of number of lines). +// For S3 it should be 9 (512 words, 2KB) +// For V5 it should be at least 10 (1024 words, 4KB) or 11 (2048 words, 8KB) + +module buffer_pool + #(parameter BUF_SIZE = 9, + parameter SET_ADDR = 64) + (input wb_clk_i, + input wb_rst_i, + input wb_we_i, + input wb_stb_i, + input [15:0] wb_adr_i, + input [31:0] wb_dat_i, + output [31:0] wb_dat_o, + output reg wb_ack_o, + output wb_err_o, + output wb_rty_o, + + input stream_clk, + input stream_rst, + + input set_stb, input [7:0] set_addr, input [31:0] set_data, + output [31:0] status, + output sys_int_o, + + output [31:0] s0, output [31:0] s1, output [31:0] s2, output [31:0] s3, + output [31:0] s4, output [31:0] s5, output [31:0] s6, output [31:0] s7, + + // Write Interfaces + input [31:0] wr0_data_i, input [3:0] wr0_flags_i, input wr0_ready_i, output wr0_ready_o, + input [31:0] wr1_data_i, input [3:0] wr1_flags_i, input wr1_ready_i, output wr1_ready_o, + input [31:0] wr2_data_i, input [3:0] wr2_flags_i, input wr2_ready_i, output wr2_ready_o, + input [31:0] wr3_data_i, input [3:0] wr3_flags_i, input wr3_ready_i, output wr3_ready_o, + + // Read Interfaces + output [31:0] rd0_data_o, output [3:0] rd0_flags_o, output rd0_ready_o, input rd0_ready_i, + output [31:0] rd1_data_o, output [3:0] rd1_flags_o, output rd1_ready_o, input rd1_ready_i, + output [31:0] rd2_data_o, output [3:0] rd2_flags_o, output rd2_ready_o, input rd2_ready_i, + output [31:0] rd3_data_o, output [3:0] rd3_flags_o, output rd3_ready_o, input rd3_ready_i + ); + + wire [7:0] sel_a; + + wire [BUF_SIZE-1:0] buf_addra = wb_adr_i[BUF_SIZE+1:2]; // ignore address 1:0, 32-bit access only + wire [2:0] which_buf = wb_adr_i[BUF_SIZE+4:BUF_SIZE+2]; // address 15:14 selects the buffer pool + + decoder_3_8 dec(.sel(which_buf),.res(sel_a)); + + genvar i; + + wire go; + + reg [2:0] port[0:7]; + reg [3:0] read_src[0:3]; + reg [3:0] write_src[0:3]; + + wire [7:0] done; + wire [7:0] error; + wire [7:0] idle; + + wire [31:0] buf_doa[0:7]; + + wire [7:0] buf_enb; + wire [7:0] buf_web; + wire [BUF_SIZE-1:0] buf_addrb[0:7]; + wire [31:0] buf_dib[0:7]; + wire [31:0] buf_dob[0:7]; + + wire [31:0] wr_data_i[0:7]; + wire [3:0] wr_flags_i[0:7]; + wire [7:0] wr_ready_i; + wire [7:0] wr_ready_o; + + wire [31:0] rd_data_o[0:7]; + wire [3:0] rd_flags_o[0:7]; + wire [7:0] rd_ready_o; + wire [7:0] rd_ready_i; + + assign status = {8'd0,idle[7:0],error[7:0],done[7:0]}; + + assign s0 = buf_addrb[0]; + assign s1 = buf_addrb[1]; + assign s2 = buf_addrb[2]; + assign s3 = buf_addrb[3]; + assign s4 = buf_addrb[4]; + assign s5 = buf_addrb[5]; + assign s6 = buf_addrb[6]; + assign s7 = buf_addrb[7]; + + wire [31:0] fifo_ctrl; + setting_reg #(.my_addr(SET_ADDR)) + sreg(.clk(stream_clk),.rst(stream_rst),.strobe(set_stb),.addr(set_addr),.in(set_data), + .out(fifo_ctrl),.changed(go)); + + integer k; + always @(posedge stream_clk) + if(stream_rst) + for(k=0;k<8;k=k+1) + port[k] <= 4; // disabled + else + for(k=0;k<8;k=k+1) + if(go & (fifo_ctrl[31:28]==k)) + port[k] <= fifo_ctrl[27:25]; + + always @(posedge stream_clk) + if(stream_rst) + for(k=0;k<4;k=k+1) + read_src[k] <= 8; // disabled + else + for(k=0;k<4;k=k+1) + if(go & fifo_ctrl[22] & (fifo_ctrl[27:25]==k)) + read_src[k] <= fifo_ctrl[31:28]; + + always @(posedge stream_clk) + if(stream_rst) + for(k=0;k<4;k=k+1) + write_src[k] <= 8; // disabled + else + for(k=0;k<4;k=k+1) + if(go & fifo_ctrl[23] & (fifo_ctrl[27:25]==k)) + write_src[k] <= fifo_ctrl[31:28]; + + generate + for(i=0;i<8;i=i+1) + begin : gen_buffer + RAMB16_S36_S36 dpram + (.DOA(buf_doa[i]),.ADDRA(buf_addra),.CLKA(wb_clk_i),.DIA(wb_dat_i),.DIPA(4'h0), + .ENA(wb_stb_i & sel_a[i]),.SSRA(0),.WEA(wb_we_i), + .DOB(buf_dob[i]),.ADDRB(buf_addrb[i]),.CLKB(stream_clk),.DIB(buf_dib[i]),.DIPB(4'h0), + .ENB(buf_enb[i]),.SSRB(0),.WEB(buf_web[i]) ); + +/* + ram_2port #(.DWIDTH(32),.AWIDTH(BUF_SIZE)) buffer + (.clka(wb_clk_i),.ena(wb_stb_i & sel_a[i]),.wea(wb_we_i), + .addra(buf_addra),.dia(wb_dat_i),.doa(buf_doa[i]), + .clkb(stream_clk),.enb(buf_enb[i]),.web(buf_web[i]), + .addrb(buf_addrb[i]),.dib(buf_dib[i]),.dob(buf_dob[i])); + + */ + + buffer_int #(.BUF_NUM(i),.BUF_SIZE(BUF_SIZE)) buffer_int + (.clk(stream_clk),.rst(stream_rst), + .ctrl_word(fifo_ctrl),.go(go & (fifo_ctrl[31:28]==i)), + .done(done[i]),.error(error[i]),.idle(idle[i]), + .en_o(buf_enb[i]), + .we_o(buf_web[i]), + .addr_o(buf_addrb[i]), + .dat_to_buf(buf_dib[i]), + .dat_from_buf(buf_dob[i]), + .wr_data_i(wr_data_i[i]), + .wr_flags_i(wr_flags_i[i]), + .wr_ready_i(wr_ready_i[i]), + .wr_ready_o(wr_ready_o[i]), + .rd_data_o(rd_data_o[i]), + .rd_flags_o(rd_flags_o[i]), + .rd_ready_o(rd_ready_o[i]), + .rd_ready_i(rd_ready_i[i]) ); + mux4 #(.WIDTH(37)) + mux4_wr (.en(~port[i][2]),.sel(port[i][1:0]), + .i0({wr0_data_i,wr0_flags_i,wr0_ready_i}), + .i1({wr1_data_i,wr1_flags_i,wr1_ready_i}), + .i2({wr2_data_i,wr2_flags_i,wr2_ready_i}), + .i3({wr3_data_i,wr3_flags_i,wr3_ready_i}), + .o({wr_data_i[i],wr_flags_i[i],wr_ready_i[i]}) ); + mux4 #(.WIDTH(1)) + mux4_rd (.en(~port[i][2]),.sel(port[i][1:0]), + .i0(rd0_ready_i),.i1(rd1_ready_i),.i2(rd2_ready_i),.i3(rd3_ready_i), + .o(rd_ready_i[i])); + end // block: gen_buffer + endgenerate + + //---------------------------------------------------------------------- + // Wishbone Outputs + + // Use the following lines if ram output and mux can be made fast enough + + assign wb_err_o = 1'b0; // Unused for now + assign wb_rty_o = 1'b0; // Unused for now + + always @(posedge wb_clk_i) + wb_ack_o <= wb_stb_i & ~wb_ack_o; + assign wb_dat_o = buf_doa[which_buf]; + + // Use this if we can't make the RAM+MUX fast enough + // reg [31:0] wb_dat_o_reg; + // reg stb_d1; + + // always @(posedge wb_clk_i) + // begin + // wb_dat_o_reg <= buf_doa[which_buf]; + // stb_d1 <= wb_stb_i; + // wb_ack_o <= (stb_d1 & ~wb_ack_o) | (wb_we_i & wb_stb_i); + // end + //assign wb_dat_o = wb_dat_o_reg; + + mux8 #(.WIDTH(1)) + mux8_wr0(.en(~write_src[0][3]),.sel(write_src[0][2:0]), + .i0(wr_ready_o[0]), .i1(wr_ready_o[1]), .i2(wr_ready_o[2]), .i3(wr_ready_o[3]), + .i4(wr_ready_o[4]), .i5(wr_ready_o[5]), .i6(wr_ready_o[6]), .i7(wr_ready_o[7]), + .o(wr0_ready_o)); + + mux8 #(.WIDTH(1)) + mux8_wr1(.en(~write_src[1][3]),.sel(write_src[1][2:0]), + .i0(wr_ready_o[0]), .i1(wr_ready_o[1]), .i2(wr_ready_o[2]), .i3(wr_ready_o[3]), + .i4(wr_ready_o[4]), .i5(wr_ready_o[5]), .i6(wr_ready_o[6]), .i7(wr_ready_o[7]), + .o(wr1_ready_o)); + + mux8 #(.WIDTH(1)) + mux8_wr2(.en(~write_src[2][3]),.sel(write_src[2][2:0]), + .i0(wr_ready_o[0]), .i1(wr_ready_o[1]), .i2(wr_ready_o[2]), .i3(wr_ready_o[3]), + .i4(wr_ready_o[4]), .i5(wr_ready_o[5]), .i6(wr_ready_o[6]), .i7(wr_ready_o[7]), + .o(wr2_ready_o)); + + mux8 #(.WIDTH(1)) + mux8_wr3(.en(~write_src[3][3]),.sel(write_src[3][2:0]), + .i0(wr_ready_o[0]), .i1(wr_ready_o[1]), .i2(wr_ready_o[2]), .i3(wr_ready_o[3]), + .i4(wr_ready_o[4]), .i5(wr_ready_o[5]), .i6(wr_ready_o[6]), .i7(wr_ready_o[7]), + .o(wr3_ready_o)); + + mux8 #(.WIDTH(37)) + mux8_rd0(.en(~read_src[0][3]),.sel(read_src[0][2:0]), + .i0({rd_data_o[0],rd_flags_o[0],rd_ready_o[0]}), + .i1({rd_data_o[1],rd_flags_o[1],rd_ready_o[1]}), + .i2({rd_data_o[2],rd_flags_o[2],rd_ready_o[2]}), + .i3({rd_data_o[3],rd_flags_o[3],rd_ready_o[3]}), + .i4({rd_data_o[4],rd_flags_o[4],rd_ready_o[4]}), + .i5({rd_data_o[5],rd_flags_o[5],rd_ready_o[5]}), + .i6({rd_data_o[6],rd_flags_o[6],rd_ready_o[6]}), + .i7({rd_data_o[7],rd_flags_o[7],rd_ready_o[7]}), + .o({rd0_data_o,rd0_flags_o,rd0_ready_o})); + + mux8 #(.WIDTH(37)) + mux8_rd1(.en(~read_src[1][3]),.sel(read_src[1][2:0]), + .i0({rd_data_o[0],rd_flags_o[0],rd_ready_o[0]}), + .i1({rd_data_o[1],rd_flags_o[1],rd_ready_o[1]}), + .i2({rd_data_o[2],rd_flags_o[2],rd_ready_o[2]}), + .i3({rd_data_o[3],rd_flags_o[3],rd_ready_o[3]}), + .i4({rd_data_o[4],rd_flags_o[4],rd_ready_o[4]}), + .i5({rd_data_o[5],rd_flags_o[5],rd_ready_o[5]}), + .i6({rd_data_o[6],rd_flags_o[6],rd_ready_o[6]}), + .i7({rd_data_o[7],rd_flags_o[7],rd_ready_o[7]}), + .o({rd1_data_o,rd1_flags_o,rd1_ready_o})); + + mux8 #(.WIDTH(37)) + mux8_rd2(.en(~read_src[2][3]),.sel(read_src[2][2:0]), + .i0({rd_data_o[0],rd_flags_o[0],rd_ready_o[0]}), + .i1({rd_data_o[1],rd_flags_o[1],rd_ready_o[1]}), + .i2({rd_data_o[2],rd_flags_o[2],rd_ready_o[2]}), + .i3({rd_data_o[3],rd_flags_o[3],rd_ready_o[3]}), + .i4({rd_data_o[4],rd_flags_o[4],rd_ready_o[4]}), + .i5({rd_data_o[5],rd_flags_o[5],rd_ready_o[5]}), + .i6({rd_data_o[6],rd_flags_o[6],rd_ready_o[6]}), + .i7({rd_data_o[7],rd_flags_o[7],rd_ready_o[7]}), + .o({rd2_data_o,rd2_flags_o,rd2_ready_o})); + + mux8 #(.WIDTH(37)) + mux8_rd3(.en(~read_src[3][3]),.sel(read_src[3][2:0]), + .i0({rd_data_o[0],rd_flags_o[0],rd_ready_o[0]}), + .i1({rd_data_o[1],rd_flags_o[1],rd_ready_o[1]}), + .i2({rd_data_o[2],rd_flags_o[2],rd_ready_o[2]}), + .i3({rd_data_o[3],rd_flags_o[3],rd_ready_o[3]}), + .i4({rd_data_o[4],rd_flags_o[4],rd_ready_o[4]}), + .i5({rd_data_o[5],rd_flags_o[5],rd_ready_o[5]}), + .i6({rd_data_o[6],rd_flags_o[6],rd_ready_o[6]}), + .i7({rd_data_o[7],rd_flags_o[7],rd_ready_o[7]}), + .o({rd3_data_o,rd3_flags_o,rd3_ready_o})); + + assign sys_int_o = (|error) | (|done); + +endmodule // buffer_pool diff --git a/usrp2/control_lib/newfifo/buffer_pool_tb.v b/usrp2/control_lib/newfifo/buffer_pool_tb.v new file mode 100644 index 000000000..91a01d268 --- /dev/null +++ b/usrp2/control_lib/newfifo/buffer_pool_tb.v @@ -0,0 +1,58 @@ + +module buffer_pool_tb(); + + wire wb_clk_i; + wire wb_rst_i; + wire wb_we_i; + wire wb_stb_i; + wire [15:0] wb_adr_i; + wire [31:0] wb_dat_i; + wire [31:0] wb_dat_o; + wire wb_ack_o; + wire wb_err_o; + wire wb_rty_o; + + wire stream_clk, stream_rst; + + wire set_stb; + wire [7:0] set_addr; + wire [31:0] set_data; + + wire [31:0] wr0_data, wr1_data, wr2_data, wr3_data; + wire [31:0] rd0_data, rd1_data, rd2_data, rd3_data; + wire [3:0] wr0_flags, wr1_flags, wr2_flags, wr3_flags; + wire [3:0] rd0_flags, rd1_flags, rd2_flags, rd3_flags; + wire wr0_ready, wr1_ready, wr2_ready, wr3_ready; + wire rd0_ready, rd1_ready, rd2_ready, rd3_ready; + wire wr0_write, wr1_write, wr2_write, wr3_write; + wire rd0_read, rd1_read, rd2_read, rd3_read; + + buffer_pool dut + (.wb_clk_i(wb_clk_i), + .wb_rst_i(wb_rst_i), + .wb_we_i(wb_we_i), + .wb_stb_i(wb_stb_i), + .wb_adr_i(wb_adr_i), + .wb_dat_i(wb_dat_i), + .wb_dat_o(wb_dat_o), + .wb_ack_o(wb_ack_o), + .wb_err_o(wb_err_o), + .wb_rty_o(wb_rty_o), + + .stream_clk(stream_clk), + .stream_rst(stream_rst), + + .set_stb(set_stb),.set_addr(set_addr),.set_data(set_data), + + .wr0_data_i(wr0_data), .wr0_write_i(wr0_write), .wr0_flags_i(wr0_flags), .wr0_ready_o(wr0_ready), + .wr1_data_i(wr1_data), .wr1_write_i(wr1_write), .wr1_flags_i(wr1_flags), .wr1_ready_o(wr1_ready), + .wr2_data_i(wr2_data), .wr2_write_i(wr2_write), .wr2_flags_i(wr2_flags), .wr2_ready_o(wr2_ready), + .wr3_data_i(wr3_data), .wr3_write_i(wr3_write), .wr3_flags_i(wr3_flags), .wr3_ready_o(wr3_ready), + + .rd0_data_o(rd0_data), .rd0_read_i(rd0_read), .rd0_flags_o(rd0_flags), .rd0_ready_o(rd0_ready), + .rd1_data_o(rd1_data), .rd1_read_i(rd1_read), .rd1_flags_o(rd1_flags), .rd1_ready_o(rd1_ready), + .rd2_data_o(rd2_data), .rd2_read_i(rd2_read), .rd2_flags_o(rd2_flags), .rd2_ready_o(rd2_ready), + .rd3_data_o(rd3_data), .rd3_read_i(rd3_read), .rd3_flags_o(rd3_flags), .rd3_ready_o(rd3_ready) + ); + +endmodule // buffer_pool_tb diff --git a/usrp2/control_lib/newfifo/fifo19_to_fifo36.v b/usrp2/control_lib/newfifo/fifo19_to_fifo36.v new file mode 100644 index 000000000..e22ca0a49 --- /dev/null +++ b/usrp2/control_lib/newfifo/fifo19_to_fifo36.v @@ -0,0 +1,71 @@ + +module fifo19_to_fifo36 + (input clk, input reset, input clear, + input [18:0] f19_datain, + input f19_src_rdy_i, + output f19_dst_rdy_o, + + output [35:0] f36_dataout, + output f36_src_rdy_o, + input f36_dst_rdy_i + ); + + reg f36_sof, f36_eof, f36_occ; + + reg [1:0] state; + reg [15:0] dat0, dat1; + + wire f19_sof = f19_datain[16]; + wire f19_eof = f19_datain[17]; + wire f19_occ = f19_datain[18]; + + wire xfer_out = f36_src_rdy_o & f36_dst_rdy_i; + + always @(posedge clk) + if(f19_src_rdy_i & ((state==0)|xfer_out)) + f36_sof <= f19_sof; + + always @(posedge clk) + if(f19_src_rdy_i & ((state != 2)|xfer_out)) + f36_eof <= f19_eof; + + always @(posedge clk) // FIXME check this + if(f19_eof) + f36_occ <= {state[0],f19_occ}; + else + f36_occ <= 0; + + always @(posedge clk) + if(reset) + state <= 0; + else + if(f19_src_rdy_i) + case(state) + 0 : + if(f19_eof) + state <= 2; + else + state <= 1; + 1 : + state <= 2; + 2 : + if(xfer_out) + state <= 1; + endcase // case(state) + else + if(xfer_out) + state <= 0; + + always @(posedge clk) + if(f19_src_rdy_i & (state==1)) + dat1 <= f19_datain; + + always @(posedge clk) + if(f19_src_rdy_i & ((state==0) | xfer_out)) + dat0 <= f19_datain; + + assign f19_dst_rdy_o = xfer_out | (state != 2); + assign f36_dataout = {f36_occ,f36_eof,f36_sof,dat0,dat1}; + assign f36_src_rdy_o = (state == 2); + +endmodule // fifo19_to_fifo36 diff --git a/usrp2/control_lib/newfifo/fifo19_to_ll8.v b/usrp2/control_lib/newfifo/fifo19_to_ll8.v new file mode 100644 index 000000000..4707f7523 --- /dev/null +++ b/usrp2/control_lib/newfifo/fifo19_to_ll8.v @@ -0,0 +1,53 @@ + +module fifo19_to_ll8 + (input clk, input reset, input clear, + input [18:0] f19_data, + input f19_src_rdy_i, + output f19_dst_rdy_o, + + output reg [7:0] ll_data, + output ll_sof_n, + output ll_eof_n, + output ll_src_rdy_n, + input ll_dst_rdy_n); + + wire ll_sof, ll_eof, ll_src_rdy; + assign ll_sof_n = ~ll_sof; + assign ll_eof_n = ~ll_eof; + assign ll_src_rdy_n = ~ll_src_rdy; + wire ll_dst_rdy = ~ll_dst_rdy_n; + + wire f19_sof = f19_data[16]; + wire f19_eof = f19_data[17]; + wire f19_occ = f19_data[18]; + + wire advance, end_early; + reg state; + + always @(posedge clk) + if(reset) + state <= 0; + else + if(advance) + if(ll_eof) + state <= 0; + else + state <= state + 1; + + always @* + case(state) + 0 : ll_data = f19_data[15:8]; + 1 : ll_data = f19_data[7:0]; + default : ll_data = f19_data[15:8]; + endcase // case (state) + + assign ll_sof = (state==0) & f19_sof; + assign ll_eof = f19_eof & ((f19_occ==1)|(state==1)); + + assign ll_src_rdy = f19_src_rdy_i; + + assign advance = ll_src_rdy & ll_dst_rdy; + assign f19_dst_rdy_o = advance & ((state==1)|ll_eof); + +endmodule // fifo19_to_ll8 + diff --git a/usrp2/control_lib/newfifo/fifo36_to_fifo18.v b/usrp2/control_lib/newfifo/fifo36_to_fifo18.v new file mode 100644 index 000000000..b636ab9ca --- /dev/null +++ b/usrp2/control_lib/newfifo/fifo36_to_fifo18.v @@ -0,0 +1,40 @@ + +module fifo36_to_fifo18 + (input clk, input reset, input clear, + input [35:0] f36_datain, + input f36_src_rdy_i, + output f36_dst_rdy_o, + + output [17:0] f18_dataout, + output f18_src_rdy_o, + input f18_dst_rdy_i ); + + wire f36_sof = f36_datain[32]; + wire f36_eof = f36_datain[33]; + wire f36_occ = f36_datain[35:34]; + + reg phase; + + wire half_line = f36_eof & ((f36_occ==1)|(f36_occ==2)); + + assign f18_dataout[15:0] = phase ? f36_datain[15:0] : f36_datain[31:16]; + assign f18_dataout[16] = phase ? 0 : f36_sof; + assign f18_dataout[17] = phase ? f36_eof : half_line; + + assign f18_src_rdy_o = f36_src_rdy_i; + assign f36_dst_rdy_o = (phase | half_line) & f18_dst_rdy_i; + + wire f18_xfer = f18_src_rdy_o & f18_dst_rdy_i; + wire f36_xfer = f36_src_rdy_i & f36_dst_rdy_o; + + always @(posedge clk) + if(reset) + phase <= 0; + else if(f36_xfer) + phase <= 0; + else if(f18_xfer) + phase <= 1; + + +endmodule // fifo36_to_fifo18 + diff --git a/usrp2/control_lib/newfifo/fifo36_to_fifo19.v b/usrp2/control_lib/newfifo/fifo36_to_fifo19.v new file mode 100644 index 000000000..de249aaeb --- /dev/null +++ b/usrp2/control_lib/newfifo/fifo36_to_fifo19.v @@ -0,0 +1,41 @@ + +module fifo36_to_fifo19 + (input clk, input reset, input clear, + input [35:0] f36_datain, + input f36_src_rdy_i, + output f36_dst_rdy_o, + + output [18:0] f19_dataout, + output f19_src_rdy_o, + input f19_dst_rdy_i ); + + wire f36_sof = f36_datain[32]; + wire f36_eof = f36_datain[33]; + wire f36_occ = f36_datain[35:34]; + + reg phase; + + wire half_line = f36_eof & ((f36_occ==1)|(f36_occ==2)); + + assign f19_dataout[15:0] = phase ? f36_datain[15:0] : f36_datain[31:16]; + assign f19_dataout[16] = phase ? 0 : f36_sof; + assign f19_dataout[17] = phase ? f36_eof : half_line; + assign f19_dataout[18] = f19_dataout[17] & ((f36_occ==1)|(f36_occ==3)); + + assign f19_src_rdy_o = f36_src_rdy_i; + assign f36_dst_rdy_o = (phase | half_line) & f19_dst_rdy_i; + + wire f19_xfer = f19_src_rdy_o & f19_dst_rdy_i; + wire f36_xfer = f36_src_rdy_i & f36_dst_rdy_o; + + always @(posedge clk) + if(reset) + phase <= 0; + else if(f36_xfer) + phase <= 0; + else if(f19_xfer) + phase <= 1; + + +endmodule // fifo36_to_fifo19 + diff --git a/usrp2/control_lib/newfifo/fifo36_to_ll8.v b/usrp2/control_lib/newfifo/fifo36_to_ll8.v new file mode 100644 index 000000000..0dee1dfc6 --- /dev/null +++ b/usrp2/control_lib/newfifo/fifo36_to_ll8.v @@ -0,0 +1,60 @@ + +module fifo36_to_ll8 + (input clk, input reset, input clear, + input [35:0] f36_data, + input f36_src_rdy_i, + output f36_dst_rdy_o, + + output reg [7:0] ll_data, + output ll_sof_n, + output ll_eof_n, + output ll_src_rdy_n, + input ll_dst_rdy_n, + + output [31:0] debug); + + wire ll_sof, ll_eof, ll_src_rdy; + assign ll_sof_n = ~ll_sof; + assign ll_eof_n = ~ll_eof; + assign ll_src_rdy_n = ~ll_src_rdy; + wire ll_dst_rdy = ~ll_dst_rdy_n; + + wire f36_sof = f36_data[32]; + wire f36_eof = f36_data[33]; + wire f36_occ = f36_data[35:34]; + wire advance, end_early; + reg [1:0] state; + assign debug = {29'b0,state}; + + always @(posedge clk) + if(reset) + state <= 0; + else + if(advance) + if(ll_eof) + state <= 0; + else + state <= state + 1; + + always @* + case(state) + 0 : ll_data = f36_data[31:24]; + 1 : ll_data = f36_data[23:16]; + 2 : ll_data = f36_data[15:8]; + 3 : ll_data = f36_data[7:0]; + default : ll_data = f36_data[31:24]; + endcase // case (state) + + assign ll_sof = (state==0) & f36_sof; + assign ll_eof = f36_eof & (((state==0)&(f36_occ==1)) | + ((state==1)&(f36_occ==2)) | + ((state==2)&(f36_occ==3)) | + (state==3)); + + assign ll_src_rdy = f36_src_rdy_i; + + assign advance = ll_src_rdy & ll_dst_rdy; + assign f36_dst_rdy_o = advance & ((state==3)|ll_eof); + assign debug = state; + +endmodule // ll8_to_fifo36 diff --git a/usrp2/control_lib/newfifo/fifo_2clock.v b/usrp2/control_lib/newfifo/fifo_2clock.v new file mode 100644 index 000000000..34c85ccb4 --- /dev/null +++ b/usrp2/control_lib/newfifo/fifo_2clock.v @@ -0,0 +1,117 @@ + +// FIXME ignores the AWIDTH (fifo size) parameter + +module fifo_2clock + #(parameter WIDTH=36, SIZE=6) + (input wclk, input [WIDTH-1:0] datain, input src_rdy_i, output dst_rdy_o, output [15:0] space, + input rclk, output [WIDTH-1:0] dataout, output src_rdy_o, input dst_rdy_i, output [15:0] occupied, + input arst); + + wire [SIZE:0] level_rclk, level_wclk; // xilinx adds an extra bit if you ask for accurate levels + wire full, empty, write, read; + + assign dst_rdy_o = ~full; + assign src_rdy_o = ~empty; + assign write = src_rdy_i & dst_rdy_o; + assign read = src_rdy_o & dst_rdy_i; + + generate + if(WIDTH==36) + if(SIZE==9) + fifo_xlnx_512x36_2clk fifo_xlnx_512x36_2clk + (.rst(arst), + .wr_clk(wclk),.din(datain),.full(full),.wr_en(write),.wr_data_count(level_wclk), + .rd_clk(rclk),.dout(dataout),.empty(empty),.rd_en(read),.rd_data_count(level_rclk) ); + else if(SIZE==11) + fifo_xlnx_2Kx36_2clk fifo_xlnx_2Kx36_2clk + (.rst(arst), + .wr_clk(wclk),.din(datain),.full(full),.wr_en(write),.wr_data_count(level_wclk), + .rd_clk(rclk),.dout(dataout),.empty(empty),.rd_en(read),.rd_data_count(level_rclk) ); + else if(SIZE==6) + fifo_xlnx_64x36_2clk fifo_xlnx_64x36_2clk + (.rst(arst), + .wr_clk(wclk),.din(datain),.full(full),.wr_en(write),.wr_data_count(level_wclk), + .rd_clk(rclk),.dout(dataout),.empty(empty),.rd_en(read),.rd_data_count(level_rclk) ); + else + fifo_xlnx_512x36_2clk fifo_xlnx_512x36_2clk + (.rst(arst), + .wr_clk(wclk),.din(datain),.full(full),.wr_en(write),.wr_data_count(level_wclk), + .rd_clk(rclk),.dout(dataout),.empty(empty),.rd_en(read),.rd_data_count(level_rclk) ); + else if((WIDTH==19)|(WIDTH==18)) + if(SIZE==4) + fifo_xlnx_16x19_2clk fifo_xlnx_16x19_2clk + (.rst(arst), + .wr_clk(wclk),.din(datain),.full(full),.wr_en(write),.wr_data_count(level_wclk), + .rd_clk(rclk),.dout(dataout),.empty(empty),.rd_en(read),.rd_data_count(level_rclk) ); + endgenerate + + assign occupied = {{(16-SIZE-1){1'b0}},level_rclk}; + assign space = ((1<<SIZE)+1)-level_wclk; + +endmodule // fifo_2clock + +/* +`else + // ISE sucks, so the following doesn't work properly + + reg [AWIDTH-1:0] wr_addr, rd_addr; + wire [AWIDTH-1:0] wr_addr_rclk, rd_addr_wclk; + wire [AWIDTH-1:0] next_rd_addr; + wire enb_read; + + // Write side management + wire [AWIDTH-1:0] next_wr_addr = wr_addr + 1; + always @(posedge wclk or posedge arst) + if(arst) + wr_addr <= 0; + else if(write) + wr_addr <= next_wr_addr; + assign full = (next_wr_addr == rd_addr_wclk); + + // RAM for data storage. Data out is registered, complicating the + // read side logic + ram_2port #(.DWIDTH(DWIDTH),.AWIDTH(AWIDTH)) mac_rx_ff_ram + (.clka(wclk),.ena(1'b1),.wea(write),.addra(wr_addr),.dia(datain),.doa(), + .clkb(rclk),.enb(enb_read),.web(1'b0),.addrb(next_rd_addr),.dib(0),.dob(dataout) ); + + // Read side management + reg data_valid; + assign empty = ~data_valid; + assign next_rd_addr = rd_addr + data_valid; + assign enb_read = read | ~data_valid; + + always @(posedge rclk or posedge arst) + if(arst) + rd_addr <= 0; + else if(read) + rd_addr <= rd_addr + 1; + + always @(posedge rclk or posedge arst) + if(arst) + data_valid <= 0; + else + if(read & (next_rd_addr == wr_addr_rclk)) + data_valid <= 0; + else if(next_rd_addr != wr_addr_rclk) + data_valid <= 1; + + // Send pointers across clock domains via gray code + gray_send #(.WIDTH(AWIDTH)) send_wr_addr + (.clk_in(wclk),.addr_in(wr_addr), + .clk_out(rclk),.addr_out(wr_addr_rclk) ); + + gray_send #(.WIDTH(AWIDTH)) send_rd_addr + (.clk_in(rclk),.addr_in(rd_addr), + .clk_out(wclk),.addr_out(rd_addr_wclk) ); + + // Generate fullness info, these are approximate and may be delayed + // and are only for higher-level flow control. + // Only full and empty are guaranteed exact. + always @(posedge wclk) + level_wclk <= wr_addr - rd_addr_wclk; + always @(posedge rclk) + level_rclk <= wr_addr_rclk - rd_addr; +`endif +endmodule // fifo_2clock + +*/ diff --git a/usrp2/control_lib/newfifo/fifo_2clock_cascade.v b/usrp2/control_lib/newfifo/fifo_2clock_cascade.v new file mode 100644 index 000000000..5ce726977 --- /dev/null +++ b/usrp2/control_lib/newfifo/fifo_2clock_cascade.v @@ -0,0 +1,35 @@ + +module fifo_2clock_cascade + #(parameter WIDTH=32, SIZE=9) + (input wclk, input [WIDTH-1:0] datain, input src_rdy_i, output dst_rdy_o, output [15:0] space, + input rclk, output [WIDTH-1:0] dataout, output src_rdy_o, input dst_rdy_i, output [15:0] occupied, + input arst); + + wire [WIDTH-1:0] data_int1, data_int2; + wire src_rdy_int1, src_rdy_int2, dst_rdy_int1, dst_rdy_int2; + wire [SIZE-1:0] level_wclk, level_rclk; + wire [4:0] s1_space, s1_occupied, s2_space, s2_occupied; + wire [15:0] l_space, l_occupied; + + fifo_short #(.WIDTH(WIDTH)) shortfifo + (.clk(wclk), .reset(arst), .clear(0), + .datain(datain), .src_rdy_i(src_rdy_i), .dst_rdy_o(dst_rdy_o), + .dataout(data_int1), .src_rdy_o(src_rdy_int1), .dst_rdy_i(dst_rdy_int1), + .space(s1_space), .occupied(s1_occupied) ); + + fifo_2clock #(.WIDTH(WIDTH),.SIZE(SIZE)) fifo_2clock + (.wclk(wclk), .datain(data_int1), .src_rdy_i(src_rdy_int1), .dst_rdy_o(dst_rdy_int1), .space(l_space), + .rclk(rclk), .dataout(data_int2), .src_rdy_o(src_rdy_int2), .dst_rdy_i(dst_rdy_int2), .occupied(l_occupied), + .arst(arst) ); + + fifo_short #(.WIDTH(WIDTH)) shortfifo2 + (.clk(rclk), .reset(arst), .clear(0), + .datain(data_int2), .src_rdy_i(src_rdy_int2), .dst_rdy_o(dst_rdy_int2), + .dataout(dataout), .src_rdy_o(src_rdy_o), .dst_rdy_i(dst_rdy_i), + .space(s2_space), .occupied(s2_occupied)); + + // Be conservative -- Only advertise space from input side of fifo, occupied from output side + assign space = {11'b0,s1_space} + l_space; + assign occupied = {11'b0,s2_occupied} + l_occupied; + +endmodule // fifo_2clock_cascade diff --git a/usrp2/control_lib/newfifo/fifo_cascade.v b/usrp2/control_lib/newfifo/fifo_cascade.v new file mode 100644 index 000000000..fdd8449bc --- /dev/null +++ b/usrp2/control_lib/newfifo/fifo_cascade.v @@ -0,0 +1,52 @@ + + +// This FIFO exists to provide an intermediate point for the data on its +// long trek from one RAM (in the buffer pool) to another (in the longfifo) +// The shortfifo is more flexible in its placement since it is based on +// distributed RAM + +// This one has the shortfifo on both the in and out sides. +module fifo_cascade + #(parameter WIDTH=32, SIZE=9) + (input clk, input reset, input clear, + input [WIDTH-1:0] datain, + input src_rdy_i, + output dst_rdy_o, + output [WIDTH-1:0] dataout, + output src_rdy_o, + input dst_rdy_i, + output [15:0] space, + output [15:0] occupied); + + wire [WIDTH-1:0] data_int, data_int2; + wire src_rdy_1, dst_rdy_1, src_rdy_2, dst_rdy_2; + + wire [4:0] s1_space, s1_occupied, s2_space, s2_occupied; + wire [15:0] l_space, l_occupied; + + fifo_short #(.WIDTH(WIDTH)) head_fifo + (.clk(clk),.reset(reset),.clear(clear), + .datain(datain), .src_rdy_i(src_rdy_i), .dst_rdy_o(dst_rdy_o), + .dataout(data_int), .src_rdy_o(src_rdy_1), .dst_rdy_i(dst_rdy_1), + .space(s1_space),.occupied(s1_occupied) ); + + fifo_long #(.WIDTH(WIDTH),.SIZE(SIZE)) middle_fifo + (.clk(clk),.reset(reset),.clear(clear), + .datain(data_int), .src_rdy_i(src_rdy_1), .dst_rdy_o(dst_rdy_1), + .dataout(data_int2), .src_rdy_o(src_rdy_2), .dst_rdy_i(dst_rdy_2), + .space(l_space),.occupied(l_occupied) ); + + fifo_short #(.WIDTH(WIDTH)) tail_fifo + (.clk(clk),.reset(reset),.clear(clear), + .datain(data_int2), .src_rdy_i(src_rdy_2), .dst_rdy_o(dst_rdy_2), + .dataout(dataout), .src_rdy_o(src_rdy_o), .dst_rdy_i(dst_rdy_i), + .space(s2_space),.occupied(s2_occupied) ); + + assign space = {11'b0,s1_space} + {11'b0,s2_space} + l_space; + assign occupied = {11'b0,s1_occupied} + {11'b0,s2_occupied} + l_occupied; + +endmodule // cascadefifo2 + + + + diff --git a/usrp2/control_lib/newfifo/fifo_long.v b/usrp2/control_lib/newfifo/fifo_long.v new file mode 100644 index 000000000..0426779f6 --- /dev/null +++ b/usrp2/control_lib/newfifo/fifo_long.v @@ -0,0 +1,148 @@ + +// FIFO intended to be interchangeable with shortfifo, but +// based on block ram instead of SRL16's +// only one clock domain + +// Port A is write port, Port B is read port + +module fifo_long + #(parameter WIDTH=32, SIZE=9) + (input clk, input reset, input clear, + input [WIDTH-1:0] datain, + input src_rdy_i, + output dst_rdy_o, + output [WIDTH-1:0] dataout, + output src_rdy_o, + input dst_rdy_i, + + output reg [15:0] space, + output reg [15:0] occupied); + + wire write = src_rdy_i & dst_rdy_o; + wire read = dst_rdy_i & src_rdy_o; + wire full, empty; + + assign dst_rdy_o = ~full; + assign src_rdy_o = ~empty; + + // Read side states + localparam EMPTY = 0; + localparam PRE_READ = 1; + localparam READING = 2; + + reg [SIZE-1:0] wr_addr, rd_addr; + reg [1:0] read_state; + + reg empty_reg, full_reg; + always @(posedge clk) + if(reset) + wr_addr <= 0; + else if(clear) + wr_addr <= 0; + else if(write) + wr_addr <= wr_addr + 1; + + ram_2port #(.DWIDTH(WIDTH),.AWIDTH(SIZE)) + ram (.clka(clk), + .ena(1'b1), + .wea(write), + .addra(wr_addr), + .dia(datain), + .doa(), + + .clkb(clk), + .enb((read_state==PRE_READ)|read), + .web(0), + .addrb(rd_addr), + .dib(0), + .dob(dataout)); + + always @(posedge clk) + if(reset) + begin + read_state <= EMPTY; + rd_addr <= 0; + empty_reg <= 1; + end + else + if(clear) + begin + read_state <= EMPTY; + rd_addr <= 0; + empty_reg <= 1; + end + else + case(read_state) + EMPTY : + if(write) + begin + //rd_addr <= wr_addr; + read_state <= PRE_READ; + end + PRE_READ : + begin + read_state <= READING; + empty_reg <= 0; + rd_addr <= rd_addr + 1; + end + + READING : + if(read) + if(rd_addr == wr_addr) + begin + empty_reg <= 1; + if(write) + read_state <= PRE_READ; + else + read_state <= EMPTY; + end + else + rd_addr <= rd_addr + 1; + endcase // case(read_state) + + wire [SIZE-1:0] dont_write_past_me = rd_addr - 3; + wire becoming_full = wr_addr == dont_write_past_me; + + always @(posedge clk) + if(reset) + full_reg <= 0; + else if(clear) + full_reg <= 0; + else if(read & ~write) + full_reg <= 0; + //else if(write & ~read & (wr_addr == (rd_addr-3))) + else if(write & ~read & becoming_full) + full_reg <= 1; + + //assign empty = (read_state != READING); + assign empty = empty_reg; + + // assign full = ((rd_addr - 1) == wr_addr); + assign full = full_reg; + + ////////////////////////////////////////////// + // space and occupied are for diagnostics only + // not guaranteed exact + + localparam NUMLINES = (1<<SIZE)-2; + always @(posedge clk) + if(reset) + space <= NUMLINES; + else if(clear) + space <= NUMLINES; + else if(read & ~write) + space <= space + 1; + else if(write & ~read) + space <= space - 1; + + always @(posedge clk) + if(reset) + occupied <= 0; + else if(clear) + occupied <= 0; + else if(read & ~write) + occupied <= occupied - 1; + else if(write & ~read) + occupied <= occupied + 1; + +endmodule // fifo_long diff --git a/usrp2/control_lib/newfifo/fifo_new_tb.vcd b/usrp2/control_lib/newfifo/fifo_new_tb.vcd new file mode 100644 index 000000000..796889e7d --- /dev/null +++ b/usrp2/control_lib/newfifo/fifo_new_tb.vcd @@ -0,0 +1,5506 @@ +$date + Thu Mar 19 17:21:11 2009 +$end +$version + Icarus Verilog +$end +$timescale + 1ps +$end +$scope module fifo_new_tb $end +$var wire 1 ! dst_rdy_f36i $end +$var wire 36 " f36_in [35:0] $end +$var wire 36 # i1 [35:0] $end +$var wire 1 $ i1_dr $end +$var wire 1 % i1_sr $end +$var wire 19 & i2 [18:0] $end +$var wire 1 ' i2_dr $end +$var wire 1 ( i2_sr $end +$var wire 19 ) i3 [18:0] $end +$var wire 1 * i3_dr $end +$var wire 1 + i3_sr $end +$var wire 36 , i4 [35:0] $end +$var wire 1 - i4_sr $end +$var wire 8 . ll_data [7:0] $end +$var wire 1 / ll_dst_rdy_n $end +$var wire 1 0 ll_eof_n $end +$var wire 1 1 ll_sof_n $end +$var wire 1 2 ll_src_rdy_n $end +$var reg 1 3 clear $end +$var reg 1 4 clk $end +$var reg 16 5 count [15:0] $end +$var reg 1 6 dst_rdy_f36o $end +$var reg 32 7 f36_data [31:0] $end +$var reg 1 8 f36_eof $end +$var reg 2 9 f36_occ [1:0] $end +$var reg 1 : f36_sof $end +$var reg 1 ; i4_dr $end +$var reg 1 < rst $end +$var reg 1 = src_rdy_f36i $end +$scope module fifo_short1 $end +$var wire 1 > clear $end +$var wire 1 ? clk $end +$var wire 36 @ datain [35:0] $end +$var wire 36 A dataout [35:0] $end +$var wire 1 $ dst_rdy_i $end +$var wire 1 ! dst_rdy_o $end +$var wire 1 B read $end +$var wire 1 C reset $end +$var wire 1 D src_rdy_i $end +$var wire 1 % src_rdy_o $end +$var wire 1 E write $end +$var reg 4 F a [3:0] $end +$var reg 1 G empty $end +$var reg 1 H full $end +$var reg 5 I occupied [4:0] $end +$var reg 5 J space [4:0] $end +$scope begin gen_srl16[0] $end +$scope module srl16e $end +$var wire 1 K A0 $end +$var wire 1 L A1 $end +$var wire 1 M A2 $end +$var wire 1 N A3 $end +$var wire 1 E CE $end +$var wire 1 ? CLK $end +$var wire 1 O D $end +$var wire 1 P Q $end +$var reg 16 Q data [15:0] $end +$upscope $end +$upscope $end +$scope begin gen_srl16[1] $end +$scope module srl16e $end +$var wire 1 R A0 $end +$var wire 1 S A1 $end +$var wire 1 T A2 $end +$var wire 1 U A3 $end +$var wire 1 E CE $end +$var wire 1 ? CLK $end +$var wire 1 V D $end +$var wire 1 W Q $end +$var reg 16 X data [15:0] $end +$upscope $end +$upscope $end +$scope begin gen_srl16[2] $end +$scope module srl16e $end +$var wire 1 Y A0 $end +$var wire 1 Z A1 $end +$var wire 1 [ A2 $end +$var wire 1 \ A3 $end +$var wire 1 E CE $end +$var wire 1 ? CLK $end +$var wire 1 ] D $end +$var wire 1 ^ Q $end +$var reg 16 _ data [15:0] $end +$upscope $end +$upscope $end +$scope begin gen_srl16[3] $end +$scope module srl16e $end +$var wire 1 ` A0 $end +$var wire 1 a A1 $end +$var wire 1 b A2 $end +$var wire 1 c A3 $end +$var wire 1 E CE $end +$var wire 1 ? CLK $end +$var wire 1 d D $end +$var wire 1 e Q $end +$var reg 16 f data [15:0] $end +$upscope $end +$upscope $end +$scope begin gen_srl16[4] $end +$scope module srl16e $end +$var wire 1 g A0 $end +$var wire 1 h A1 $end +$var wire 1 i A2 $end +$var wire 1 j A3 $end +$var wire 1 E CE $end +$var wire 1 ? CLK $end +$var wire 1 k D $end +$var wire 1 l Q $end +$var reg 16 m data [15:0] $end +$upscope $end +$upscope $end +$scope begin gen_srl16[5] $end +$scope module srl16e $end +$var wire 1 n A0 $end +$var wire 1 o A1 $end +$var wire 1 p A2 $end +$var wire 1 q A3 $end +$var wire 1 E CE $end +$var wire 1 ? CLK $end +$var wire 1 r D $end +$var wire 1 s Q $end +$var reg 16 t data [15:0] $end +$upscope $end +$upscope $end +$scope begin gen_srl16[6] $end +$scope module srl16e $end +$var wire 1 u A0 $end +$var wire 1 v A1 $end +$var wire 1 w A2 $end +$var wire 1 x A3 $end +$var wire 1 E CE $end +$var wire 1 ? CLK $end +$var wire 1 y D $end +$var wire 1 z Q $end +$var reg 16 { data [15:0] $end +$upscope $end +$upscope $end +$scope begin gen_srl16[7] $end +$scope module srl16e $end +$var wire 1 | A0 $end +$var wire 1 } A1 $end +$var wire 1 ~ A2 $end +$var wire 1 !" A3 $end +$var wire 1 E CE $end +$var wire 1 ? CLK $end +$var wire 1 "" D $end +$var wire 1 #" Q $end +$var reg 16 $" data [15:0] $end +$upscope $end +$upscope $end +$scope begin gen_srl16[8] $end +$scope module srl16e $end +$var wire 1 %" A0 $end +$var wire 1 &" A1 $end +$var wire 1 '" A2 $end +$var wire 1 (" A3 $end +$var wire 1 E CE $end +$var wire 1 ? CLK $end +$var wire 1 )" D $end +$var wire 1 *" Q $end +$var reg 16 +" data [15:0] $end +$upscope $end +$upscope $end +$scope begin gen_srl16[9] $end +$scope module srl16e $end +$var wire 1 ," A0 $end +$var wire 1 -" A1 $end +$var wire 1 ." A2 $end +$var wire 1 /" A3 $end +$var wire 1 E CE $end +$var wire 1 ? CLK $end +$var wire 1 0" D $end +$var wire 1 1" Q $end +$var reg 16 2" data [15:0] $end +$upscope $end +$upscope $end +$scope begin gen_srl16[10] $end +$scope module srl16e $end +$var wire 1 3" A0 $end +$var wire 1 4" A1 $end +$var wire 1 5" A2 $end +$var wire 1 6" A3 $end +$var wire 1 E CE $end +$var wire 1 ? CLK $end +$var wire 1 7" D $end +$var wire 1 8" Q $end +$var reg 16 9" data [15:0] $end +$upscope $end +$upscope $end +$scope begin gen_srl16[11] $end +$scope module srl16e $end +$var wire 1 :" A0 $end +$var wire 1 ;" A1 $end +$var wire 1 <" A2 $end +$var wire 1 =" A3 $end +$var wire 1 E CE $end +$var wire 1 ? CLK $end +$var wire 1 >" D $end +$var wire 1 ?" Q $end +$var reg 16 @" data [15:0] $end +$upscope $end +$upscope $end +$scope begin gen_srl16[12] $end +$scope module srl16e $end +$var wire 1 A" A0 $end +$var wire 1 B" A1 $end +$var wire 1 C" A2 $end +$var wire 1 D" A3 $end +$var wire 1 E CE $end +$var wire 1 ? CLK $end +$var wire 1 E" D $end +$var wire 1 F" Q $end +$var reg 16 G" data [15:0] $end +$upscope $end +$upscope $end +$scope begin gen_srl16[13] $end +$scope module srl16e $end +$var wire 1 H" A0 $end +$var wire 1 I" A1 $end +$var wire 1 J" A2 $end +$var wire 1 K" A3 $end +$var wire 1 E CE $end +$var wire 1 ? CLK $end +$var wire 1 L" D $end +$var wire 1 M" Q $end +$var reg 16 N" data [15:0] $end +$upscope $end +$upscope $end +$scope begin gen_srl16[14] $end +$scope module srl16e $end +$var wire 1 O" A0 $end +$var wire 1 P" A1 $end +$var wire 1 Q" A2 $end +$var wire 1 R" A3 $end +$var wire 1 E CE $end +$var wire 1 ? CLK $end +$var wire 1 S" D $end +$var wire 1 T" Q $end +$var reg 16 U" data [15:0] $end +$upscope $end +$upscope $end +$scope begin gen_srl16[15] $end +$scope module srl16e $end +$var wire 1 V" A0 $end +$var wire 1 W" A1 $end +$var wire 1 X" A2 $end +$var wire 1 Y" A3 $end +$var wire 1 E CE $end +$var wire 1 ? CLK $end +$var wire 1 Z" D $end +$var wire 1 [" Q $end +$var reg 16 \" data [15:0] $end +$upscope $end +$upscope $end +$scope begin gen_srl16[16] $end +$scope module srl16e $end +$var wire 1 ]" A0 $end +$var wire 1 ^" A1 $end +$var wire 1 _" A2 $end +$var wire 1 `" A3 $end +$var wire 1 E CE $end +$var wire 1 ? CLK $end +$var wire 1 a" D $end +$var wire 1 b" Q $end +$var reg 16 c" data [15:0] $end +$upscope $end +$upscope $end +$scope begin gen_srl16[17] $end +$scope module srl16e $end +$var wire 1 d" A0 $end +$var wire 1 e" A1 $end +$var wire 1 f" A2 $end +$var wire 1 g" A3 $end +$var wire 1 E CE $end +$var wire 1 ? CLK $end +$var wire 1 h" D $end +$var wire 1 i" Q $end +$var reg 16 j" data [15:0] $end +$upscope $end +$upscope $end +$scope begin gen_srl16[18] $end +$scope module srl16e $end +$var wire 1 k" A0 $end +$var wire 1 l" A1 $end +$var wire 1 m" A2 $end +$var wire 1 n" A3 $end +$var wire 1 E CE $end +$var wire 1 ? CLK $end +$var wire 1 o" D $end +$var wire 1 p" Q $end +$var reg 16 q" data [15:0] $end +$upscope $end +$upscope $end +$scope begin gen_srl16[19] $end +$scope module srl16e $end +$var wire 1 r" A0 $end +$var wire 1 s" A1 $end +$var wire 1 t" A2 $end +$var wire 1 u" A3 $end +$var wire 1 E CE $end +$var wire 1 ? CLK $end +$var wire 1 v" D $end +$var wire 1 w" Q $end +$var reg 16 x" data [15:0] $end +$upscope $end +$upscope $end +$scope begin gen_srl16[20] $end +$scope module srl16e $end +$var wire 1 y" A0 $end +$var wire 1 z" A1 $end +$var wire 1 {" A2 $end +$var wire 1 |" A3 $end +$var wire 1 E CE $end +$var wire 1 ? CLK $end +$var wire 1 }" D $end +$var wire 1 ~" Q $end +$var reg 16 !# data [15:0] $end +$upscope $end +$upscope $end +$scope begin gen_srl16[21] $end +$scope module srl16e $end +$var wire 1 "# A0 $end +$var wire 1 ## A1 $end +$var wire 1 $# A2 $end +$var wire 1 %# A3 $end +$var wire 1 E CE $end +$var wire 1 ? CLK $end +$var wire 1 &# D $end +$var wire 1 '# Q $end +$var reg 16 (# data [15:0] $end +$upscope $end +$upscope $end +$scope begin gen_srl16[22] $end +$scope module srl16e $end +$var wire 1 )# A0 $end +$var wire 1 *# A1 $end +$var wire 1 +# A2 $end +$var wire 1 ,# A3 $end +$var wire 1 E CE $end +$var wire 1 ? CLK $end +$var wire 1 -# D $end +$var wire 1 .# Q $end +$var reg 16 /# data [15:0] $end +$upscope $end +$upscope $end +$scope begin gen_srl16[23] $end +$scope module srl16e $end +$var wire 1 0# A0 $end +$var wire 1 1# A1 $end +$var wire 1 2# A2 $end +$var wire 1 3# A3 $end +$var wire 1 E CE $end +$var wire 1 ? CLK $end +$var wire 1 4# D $end +$var wire 1 5# Q $end +$var reg 16 6# data [15:0] $end +$upscope $end +$upscope $end +$scope begin gen_srl16[24] $end +$scope module srl16e $end +$var wire 1 7# A0 $end +$var wire 1 8# A1 $end +$var wire 1 9# A2 $end +$var wire 1 :# A3 $end +$var wire 1 E CE $end +$var wire 1 ? CLK $end +$var wire 1 ;# D $end +$var wire 1 <# Q $end +$var reg 16 =# data [15:0] $end +$upscope $end +$upscope $end +$scope begin gen_srl16[25] $end +$scope module srl16e $end +$var wire 1 ># A0 $end +$var wire 1 ?# A1 $end +$var wire 1 @# A2 $end +$var wire 1 A# A3 $end +$var wire 1 E CE $end +$var wire 1 ? CLK $end +$var wire 1 B# D $end +$var wire 1 C# Q $end +$var reg 16 D# data [15:0] $end +$upscope $end +$upscope $end +$scope begin gen_srl16[26] $end +$scope module srl16e $end +$var wire 1 E# A0 $end +$var wire 1 F# A1 $end +$var wire 1 G# A2 $end +$var wire 1 H# A3 $end +$var wire 1 E CE $end +$var wire 1 ? CLK $end +$var wire 1 I# D $end +$var wire 1 J# Q $end +$var reg 16 K# data [15:0] $end +$upscope $end +$upscope $end +$scope begin gen_srl16[27] $end +$scope module srl16e $end +$var wire 1 L# A0 $end +$var wire 1 M# A1 $end +$var wire 1 N# A2 $end +$var wire 1 O# A3 $end +$var wire 1 E CE $end +$var wire 1 ? CLK $end +$var wire 1 P# D $end +$var wire 1 Q# Q $end +$var reg 16 R# data [15:0] $end +$upscope $end +$upscope $end +$scope begin gen_srl16[28] $end +$scope module srl16e $end +$var wire 1 S# A0 $end +$var wire 1 T# A1 $end +$var wire 1 U# A2 $end +$var wire 1 V# A3 $end +$var wire 1 E CE $end +$var wire 1 ? CLK $end +$var wire 1 W# D $end +$var wire 1 X# Q $end +$var reg 16 Y# data [15:0] $end +$upscope $end +$upscope $end +$scope begin gen_srl16[29] $end +$scope module srl16e $end +$var wire 1 Z# A0 $end +$var wire 1 [# A1 $end +$var wire 1 \# A2 $end +$var wire 1 ]# A3 $end +$var wire 1 E CE $end +$var wire 1 ? CLK $end +$var wire 1 ^# D $end +$var wire 1 _# Q $end +$var reg 16 `# data [15:0] $end +$upscope $end +$upscope $end +$scope begin gen_srl16[30] $end +$scope module srl16e $end +$var wire 1 a# A0 $end +$var wire 1 b# A1 $end +$var wire 1 c# A2 $end +$var wire 1 d# A3 $end +$var wire 1 E CE $end +$var wire 1 ? CLK $end +$var wire 1 e# D $end +$var wire 1 f# Q $end +$var reg 16 g# data [15:0] $end +$upscope $end +$upscope $end +$scope begin gen_srl16[31] $end +$scope module srl16e $end +$var wire 1 h# A0 $end +$var wire 1 i# A1 $end +$var wire 1 j# A2 $end +$var wire 1 k# A3 $end +$var wire 1 E CE $end +$var wire 1 ? CLK $end +$var wire 1 l# D $end +$var wire 1 m# Q $end +$var reg 16 n# data [15:0] $end +$upscope $end +$upscope $end +$scope begin gen_srl16[32] $end +$scope module srl16e $end +$var wire 1 o# A0 $end +$var wire 1 p# A1 $end +$var wire 1 q# A2 $end +$var wire 1 r# A3 $end +$var wire 1 E CE $end +$var wire 1 ? CLK $end +$var wire 1 s# D $end +$var wire 1 t# Q $end +$var reg 16 u# data [15:0] $end +$upscope $end +$upscope $end +$scope begin gen_srl16[33] $end +$scope module srl16e $end +$var wire 1 v# A0 $end +$var wire 1 w# A1 $end +$var wire 1 x# A2 $end +$var wire 1 y# A3 $end +$var wire 1 E CE $end +$var wire 1 ? CLK $end +$var wire 1 z# D $end +$var wire 1 {# Q $end +$var reg 16 |# data [15:0] $end +$upscope $end +$upscope $end +$scope begin gen_srl16[34] $end +$scope module srl16e $end +$var wire 1 }# A0 $end +$var wire 1 ~# A1 $end +$var wire 1 !$ A2 $end +$var wire 1 "$ A3 $end +$var wire 1 E CE $end +$var wire 1 ? CLK $end +$var wire 1 #$ D $end +$var wire 1 $$ Q $end +$var reg 16 %$ data [15:0] $end +$upscope $end +$upscope $end +$scope begin gen_srl16[35] $end +$scope module srl16e $end +$var wire 1 &$ A0 $end +$var wire 1 '$ A1 $end +$var wire 1 ($ A2 $end +$var wire 1 )$ A3 $end +$var wire 1 E CE $end +$var wire 1 ? CLK $end +$var wire 1 *$ D $end +$var wire 1 +$ Q $end +$var reg 16 ,$ data [15:0] $end +$upscope $end +$upscope $end +$upscope $end +$scope module fifo36_to_fifo19 $end +$var wire 1 > clear $end +$var wire 1 ? clk $end +$var wire 19 -$ f19_dataout [18:0] $end +$var wire 1 ' f19_dst_rdy_i $end +$var wire 1 ( f19_src_rdy_o $end +$var wire 1 .$ f19_xfer $end +$var wire 36 /$ f36_datain [35:0] $end +$var wire 1 $ f36_dst_rdy_o $end +$var wire 1 0$ f36_eof $end +$var wire 1 1$ f36_occ $end +$var wire 1 2$ f36_sof $end +$var wire 1 % f36_src_rdy_i $end +$var wire 1 3$ f36_xfer $end +$var wire 1 4$ half_line $end +$var wire 1 C reset $end +$var reg 1 5$ phase $end +$upscope $end +$scope module fifo19_to_ll8 $end +$var wire 1 6$ advance $end +$var wire 1 > clear $end +$var wire 1 ? clk $end +$var wire 19 7$ f19_data [18:0] $end +$var wire 1 ' f19_dst_rdy_o $end +$var wire 1 8$ f19_eof $end +$var wire 1 9$ f19_occ $end +$var wire 1 :$ f19_sof $end +$var wire 1 ( f19_src_rdy_i $end +$var wire 1 ;$ ll_dst_rdy $end +$var wire 1 / ll_dst_rdy_n $end +$var wire 1 <$ ll_eof $end +$var wire 1 0 ll_eof_n $end +$var wire 1 =$ ll_sof $end +$var wire 1 1 ll_sof_n $end +$var wire 1 >$ ll_src_rdy $end +$var wire 1 2 ll_src_rdy_n $end +$var wire 1 C reset $end +$var reg 8 ?$ ll_data [7:0] $end +$var reg 1 @$ state $end +$upscope $end +$scope module ll8_to_fifo19 $end +$var wire 1 > clear $end +$var wire 1 ? clk $end +$var wire 19 A$ f19_data [18:0] $end +$var wire 1 * f19_dst_rdy_i $end +$var wire 1 + f19_src_rdy_o $end +$var wire 8 B$ ll_data [7:0] $end +$var wire 1 C$ ll_dst_rdy $end +$var wire 1 / ll_dst_rdy_n $end +$var wire 1 D$ ll_eof $end +$var wire 1 0 ll_eof_n $end +$var wire 1 E$ ll_sof $end +$var wire 1 1 ll_sof_n $end +$var wire 1 F$ ll_src_rdy $end +$var wire 1 2 ll_src_rdy_n $end +$var wire 1 C reset $end +$var wire 1 G$ xfer_out $end +$var reg 8 H$ dat0 [7:0] $end +$var reg 8 I$ dat1 [7:0] $end +$var reg 1 J$ f19_eof $end +$var reg 1 K$ f19_occ $end +$var reg 1 L$ f19_sof $end +$var reg 2 M$ state [1:0] $end +$upscope $end +$scope module fifo19_to_fifo36 $end +$var wire 1 > clear $end +$var wire 1 ? clk $end +$var wire 19 N$ f19_datain [18:0] $end +$var wire 1 * f19_dst_rdy_o $end +$var wire 1 O$ f19_eof $end +$var wire 1 P$ f19_occ $end +$var wire 1 Q$ f19_sof $end +$var wire 1 + f19_src_rdy_i $end +$var wire 36 R$ f36_dataout [35:0] $end +$var wire 1 S$ f36_dst_rdy_i $end +$var wire 1 - f36_src_rdy_o $end +$var wire 1 C reset $end +$var wire 1 T$ xfer_out $end +$var reg 16 U$ dat0 [15:0] $end +$var reg 16 V$ dat1 [15:0] $end +$var reg 1 W$ f36_eof $end +$var reg 1 X$ f36_occ $end +$var reg 1 Y$ f36_sof $end +$var reg 2 Z$ state [1:0] $end +$upscope $end +$scope task PutPacketInFIFO36 $end +$var reg 32 [$ data_len [31:0] $end +$var reg 32 \$ data_start [31:0] $end +$upscope $end +$scope task ReadFromFIFO36 $end +$upscope $end +$upscope $end +$enddefinitions $end +#0 +$dumpvars +bx \$ +bx [$ +bx Z$ +xY$ +xX$ +xW$ +bx V$ +bx U$ +0T$ +0S$ +b0xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx R$ +xQ$ +xP$ +xO$ +bx N$ +bx M$ +xL$ +xK$ +xJ$ +bx I$ +bx H$ +xG$ +xF$ +xE$ +xD$ +xC$ +bx B$ +bx A$ +x@$ +bx ?$ +x>$ +x=$ +x<$ +x;$ +x:$ +x9$ +x8$ +bx 7$ +x6$ +x5$ +x4$ +x3$ +x2$ +x1$ +x0$ +bx /$ +x.$ +bx -$ +b0 ,$ +x+$ +0*$ +x)$ +x($ +x'$ +x&$ +b0 %$ +x$$ +0#$ +x"$ +x!$ +x~# +x}# +b0 |# +x{# +0z# +xy# +xx# +xw# +xv# +b0 u# +xt# +0s# +xr# +xq# +xp# +xo# +b0 n# +xm# +0l# +xk# +xj# +xi# +xh# +b0 g# +xf# +0e# +xd# +xc# +xb# +xa# +b0 `# +x_# +0^# +x]# +x\# +x[# +xZ# +b0 Y# +xX# +0W# +xV# +xU# +xT# +xS# +b0 R# +xQ# +0P# +xO# +xN# +xM# +xL# +b0 K# +xJ# +0I# +xH# +xG# +xF# +xE# +b0 D# +xC# +0B# +xA# +x@# +x?# +x># +b0 =# +x<# +0;# +x:# +x9# +x8# +x7# +b0 6# +x5# +04# +x3# +x2# +x1# +x0# +b0 /# +x.# +0-# +x,# +x+# +x*# +x)# +b0 (# +x'# +0&# +x%# +x$# +x## +x"# +b0 !# +x~" +0}" +x|" +x{" +xz" +xy" +b0 x" +xw" +0v" +xu" +xt" +xs" +xr" +b0 q" +xp" +0o" +xn" +xm" +xl" +xk" +b0 j" +xi" +0h" +xg" +xf" +xe" +xd" +b0 c" +xb" +0a" +x`" +x_" +x^" +x]" +b0 \" +x[" +0Z" +xY" +xX" +xW" +xV" +b0 U" +xT" +0S" +xR" +xQ" +xP" +xO" +b0 N" +xM" +0L" +xK" +xJ" +xI" +xH" +b0 G" +xF" +0E" +xD" +xC" +xB" +xA" +b0 @" +x?" +0>" +x=" +x<" +x;" +x:" +b0 9" +x8" +07" +x6" +x5" +x4" +x3" +b0 2" +x1" +00" +x/" +x." +x-" +x," +b0 +" +x*" +0)" +x(" +x'" +x&" +x%" +b0 $" +x#" +0"" +x!" +x~ +x} +x| +b0 { +xz +0y +xx +xw +xv +xu +b0 t +xs +0r +xq +xp +xo +xn +b0 m +xl +0k +xj +xi +xh +xg +b0 f +xe +0d +xc +xb +xa +x` +b0 _ +x^ +0] +x\ +x[ +xZ +xY +b0 X +xW +0V +xU +xT +xS +xR +b0 Q +xP +0O +xN +xM +xL +xK +bx J +bx I +xH +xG +bx F +0E +0D +1C +xB +bx A +b0 @ +0? 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+#19900000000000000 +04 +0? +#19950000000000000 +14 +1? +#20000000000000000 +04 +0? diff --git a/usrp2/control_lib/newfifo/fifo_short.v b/usrp2/control_lib/newfifo/fifo_short.v new file mode 100644 index 000000000..53a7603c7 --- /dev/null +++ b/usrp2/control_lib/newfifo/fifo_short.v @@ -0,0 +1,95 @@ + +module fifo_short + #(parameter WIDTH=32) + (input clk, input reset, input clear, + input [WIDTH-1:0] datain, + input src_rdy_i, + output dst_rdy_o, + output [WIDTH-1:0] dataout, + output src_rdy_o, + input dst_rdy_i, + + output reg [4:0] space, + output reg [4:0] occupied); + + reg full, empty; + wire write = src_rdy_i & dst_rdy_o; + wire read = dst_rdy_i & src_rdy_o; + + assign dst_rdy_o = ~full; + assign src_rdy_o = ~empty; + + reg [3:0] a; + genvar i; + + generate + for (i=0;i<WIDTH;i=i+1) + begin : gen_srl16 + SRL16E + srl16e(.Q(dataout[i]), + .A0(a[0]),.A1(a[1]),.A2(a[2]),.A3(a[3]), + .CE(write),.CLK(clk),.D(datain[i])); + end + endgenerate + + always @(posedge clk) + if(reset) + begin + a <= 0; + empty <= 1; + full <= 0; + end + else if(clear) + begin + a <= 0; + empty <= 1; + full<= 0; + end + else if(read & ~write) + begin + full <= 0; + if(a==0) + empty <= 1; + else + a <= a - 1; + end + else if(write & ~read) + begin + empty <= 0; + if(~empty) + a <= a + 1; + if(a == 14) + full <= 1; + end + + // NOTE will fail if you write into a full fifo or read from an empty one + + ////////////////////////////////////////////////////////////// + // space and occupied are used for diagnostics, not + // guaranteed correct + + //assign space = full ? 0 : empty ? 16 : 15-a; + //assign occupied = empty ? 0 : full ? 16 : a+1; + + always @(posedge clk) + if(reset) + space <= 16; + else if(clear) + space <= 16; + else if(read & ~write) + space <= space + 1; + else if(write & ~read) + space <= space - 1; + + always @(posedge clk) + if(reset) + occupied <= 0; + else if(clear) + occupied <= 0; + else if(read & ~write) + occupied <= occupied - 1; + else if(write & ~read) + occupied <= occupied + 1; + +endmodule // fifo_short + diff --git a/usrp2/control_lib/newfifo/fifo_spec.txt b/usrp2/control_lib/newfifo/fifo_spec.txt new file mode 100644 index 000000000..133b9fa8e --- /dev/null +++ b/usrp2/control_lib/newfifo/fifo_spec.txt @@ -0,0 +1,36 @@ + + +FIFO and Buffer Interface Spec + +Buffer Interface Data Wires -- matches fifo36 + DATA[31:0] + FLAGS[3:0] + Bit 0 SOP + Bit 1 EOP + If SOP=1 && EOP=1, OCC contains error flags + Bits 3:2 OCC[1:0] --> 00 = all 4 bytes + 01 = 1 byte + 10 = 2 bytes + 11 = 3 bytes + +fifo36 --> {OCC[1:0],EOP,SOP,DATA[31:0]} + OCC same as buffer interface + +fifo19 --> {OCC,EOP,SOP,DATA[15:0]} + Doesn't fit well into BRAM, dist RAM ok + OCC = 1 means last word is half full + = 0 means last word is full + +fifo18 --> {EOP,SOP,DATA[15:0]} + No half-word capability? Should we drop sop instead? + +Control Wires - Data into FIFO + SRC_RDY_i Upstream has data for me + DST_RDY_o I have space + Transfer occurs if SRC_RDI_i && DST_RDY_o + +Control Wires - Data out of FIFO + SRC_RDY_o I have data for downstream + DST_RDY_i Downstream has space + Transfer occurs if SRC_RDI_o && DST_RDY_i + diff --git a/usrp2/control_lib/newfifo/fifo_tb.v b/usrp2/control_lib/newfifo/fifo_tb.v new file mode 100644 index 000000000..f561df7fa --- /dev/null +++ b/usrp2/control_lib/newfifo/fifo_tb.v @@ -0,0 +1,158 @@ +module fifo_new_tb(); + + reg clk = 0; + reg rst = 1; + reg clear = 0; + initial #1000 rst = 0; + always #50 clk = ~clk; + + reg [31:0] f36_data = 0; + reg [1:0] f36_occ = 0; + reg f36_sof = 0, f36_eof = 0; + + wire [35:0] f36_in = {f36_occ,f36_eof,f36_sof,f36_data}; + reg src_rdy_f36i = 0; + wire dst_rdy_f36i; + + wire [35:0] f36_out, f36_out2; + wire src_rdy_f36o; + reg dst_rdy_f36o = 0; + + //fifo_cascade #(.WIDTH(36), .SIZE(4)) fifo_cascade36 + //fifo_long #(.WIDTH(36), .SIZE(4)) fifo_cascade36 + + wire i1_sr, i1_dr; + wire i2_sr, i2_dr; + wire i3_sr, i3_dr; + reg i4_dr = 0; + wire i4_sr; + + wire [35:0] i1, i4; + wire [18:0] i2, i3; + + wire [7:0] ll_data; + wire ll_src_rdy_n, ll_dst_rdy_n, ll_sof_n, ll_eof_n; + + fifo_short #(.WIDTH(36)) fifo_short1 + (.clk(clk),.reset(rst),.clear(clear), + .datain(f36_in),.src_rdy_i(src_rdy_f36i),.dst_rdy_o(dst_rdy_f36i), + .dataout(i1),.src_rdy_o(i1_sr),.dst_rdy_i(i1_dr) ); + + fifo36_to_fifo19 fifo36_to_fifo19 + (.clk(clk),.reset(rst),.clear(clear), + .f36_datain(i1),.f36_src_rdy_i(i1_sr),.f36_dst_rdy_o(i1_dr), + .f19_dataout(i2),.f19_src_rdy_o(i2_sr),.f19_dst_rdy_i(i2_dr) ); + + fifo19_to_ll8 fifo19_to_ll8 + (.clk(clk),.reset(rst),.clear(clear), + .f19_data(i2),.f19_src_rdy_i(i2_sr),.f19_dst_rdy_o(i2_dr), + .ll_data(ll_data),.ll_sof_n(ll_sof_n),.ll_eof_n(ll_eof_n), + .ll_src_rdy_n(ll_src_rdy_n),.ll_dst_rdy_n(ll_dst_rdy_n)); + + ll8_to_fifo19 ll8_to_fifo19 + (.clk(clk),.reset(rst),.clear(clear), + .ll_data(ll_data),.ll_sof_n(ll_sof_n),.ll_eof_n(ll_eof_n), + .ll_src_rdy_n(ll_src_rdy_n),.ll_dst_rdy_n(ll_dst_rdy_n), + .f19_data(i3),.f19_src_rdy_o(i3_sr),.f19_dst_rdy_i(i3_dr) ); + + fifo19_to_fifo36 fifo19_to_fifo36 + (.clk(clk),.reset(rst),.clear(clear), + .f19_datain(i3),.f19_src_rdy_i(i3_sr),.f19_dst_rdy_o(i3_dr), + .f36_dataout(i4),.f36_src_rdy_o(i4_sr),.f36_dst_rdy_i(i4_dr) ); + + task ReadFromFIFO36; + begin + $display("Read from FIFO36"); + #1 i4_dr <= 1; + while(1) + begin + while(~i4_sr) + @(posedge clk); + $display("Read: %h",i4); + @(posedge clk); + end + end + endtask // ReadFromFIFO36 + + reg [15:0] count; + task PutPacketInFIFO36; + input [31:0] data_start; + input [31:0] data_len; + begin + count <= 4; + src_rdy_f36i <= 1; + f36_data <= data_start; + f36_sof <= 1; + f36_eof <= 0; + f36_occ <= 0; + + $display("Put Packet in FIFO36"); + while(~dst_rdy_f36i) + @(posedge clk); + @(posedge clk); + $display("PPI_FIFO36: Entered First Line"); + f36_sof <= 0; + while(count+4 < data_len) + begin + f36_data <= f36_data + 32'h01010101; + count <= count + 4; + while(~dst_rdy_f36i) + @(posedge clk); + @(posedge clk); + $display("PPI_FIFO36: Entered New Line"); + end + f36_data <= f36_data + 32'h01010101; + f36_eof <= 1; + if(count + 4 == data_len) + f36_occ <= 0; + else if(count + 3 == data_len) + f36_occ <= 3; + else if(count + 2 == data_len) + f36_occ <= 2; + else + f36_occ <= 1; + while(~dst_rdy_f36i) + @(posedge clk); + @(posedge clk); + f36_occ <= 0; + f36_eof <= 0; + f36_data <= 0; + src_rdy_f36i <= 0; + $display("PPI_FIFO36: Entered Last Line"); + end + endtask // PutPacketInFIFO36 + + initial $dumpfile("fifo_new_tb.vcd"); + initial $dumpvars(0,fifo_new_tb); + + initial + begin + @(negedge rst); + //#10000; + @(posedge clk); + @(posedge clk); + @(posedge clk); + @(posedge clk); + ReadFromFIFO36; + end + + initial + begin + @(negedge rst); + @(posedge clk); + @(posedge clk); + PutPacketInFIFO36(32'hA0B0C0D0,12); + @(posedge clk); + @(posedge clk); + #10000; + @(posedge clk); + PutPacketInFIFO36(32'hE0F0A0B0,36); + @(posedge clk); + @(posedge clk); + @(posedge clk); + @(posedge clk); + @(posedge clk); + end + + initial #20000 $finish; +endmodule // longfifo_tb diff --git a/usrp2/control_lib/newfifo/ll8_shortfifo.v b/usrp2/control_lib/newfifo/ll8_shortfifo.v new file mode 100644 index 000000000..39ada9a4f --- /dev/null +++ b/usrp2/control_lib/newfifo/ll8_shortfifo.v @@ -0,0 +1,13 @@ + + +module ll8_shortfifo + (input clk, input reset, input clear, + input [7:0] datain, input sof_i, input eof_i, input error_i, input src_rdy_i, output dst_rdy_o, + output [7:0] dataout, output sof_o, output eof_o, output error_o, output src_rdy_o, input dst_rdy_i); + + fifo_short #(.WIDTH(11)) fifo_short + (.clk(clk), .reset(reset), .clear(clear), + .datain({error_i,eof_i,sof_i,datain}), .src_rdy_i(src_rdy_i), .dst_rdy_o(dst_rdy_o), + .dataout({error_o,eof_o,sof_o,dataout}), .src_rdy_o(src_rdy_o), .dst_rdy_i(dst_rdy_i)); + +endmodule // ll8_shortfifo diff --git a/usrp2/control_lib/newfifo/ll8_to_fifo19.v b/usrp2/control_lib/newfifo/ll8_to_fifo19.v new file mode 100644 index 000000000..c65be5136 --- /dev/null +++ b/usrp2/control_lib/newfifo/ll8_to_fifo19.v @@ -0,0 +1,77 @@ + +module ll8_to_fifo19 + (input clk, input reset, input clear, + input [7:0] ll_data, + input ll_sof_n, + input ll_eof_n, + input ll_src_rdy_n, + output ll_dst_rdy_n, + + output [18:0] f19_data, + output f19_src_rdy_o, + input f19_dst_rdy_i ); + + // Why anybody would use active low in an FPGA is beyond me... + wire ll_sof = ~ll_sof_n; + wire ll_eof = ~ll_eof_n; + wire ll_src_rdy = ~ll_src_rdy_n; + wire ll_dst_rdy; + assign ll_dst_rdy_n = ~ll_dst_rdy; + + wire xfer_out = f19_src_rdy_o & f19_dst_rdy_i; + // wire xfer_in = ll_src_rdy & ll_dst_rdy; Not needed + + reg f19_sof, f19_eof, f19_occ; + + reg [1:0] state; + reg [7:0] dat0, dat1; + + always @(posedge clk) + if(ll_src_rdy & ((state==0)|xfer_out)) + f19_sof <= ll_sof; + + always @(posedge clk) + if(ll_src_rdy & ((state != 2)|xfer_out)) + f19_eof <= ll_eof; + + always @(posedge clk) + if(ll_eof) + f19_occ <= ~state[0]; + else + f19_occ <= 0; + + always @(posedge clk) + if(reset) + state <= 0; + else + if(ll_src_rdy) + case(state) + 0 : + if(ll_eof) + state <= 2; + else + state <= 1; + 1 : + state <= 2; + 2 : + if(xfer_out) + state <= 1; + endcase // case(state) + else + if(xfer_out) + state <= 0; + + always @(posedge clk) + if(ll_src_rdy & (state==1)) + dat1 <= ll_data; + + always @(posedge clk) + if(ll_src_rdy & ((state==0) | xfer_out)) + dat0 <= ll_data; + + assign ll_dst_rdy = xfer_out | (state != 2); + assign f19_data = {f19_occ,f19_eof,f19_sof,dat0,dat1}; + assign f19_src_rdy_o = (state == 2); + +endmodule // ll8_to_fifo19 + diff --git a/usrp2/control_lib/newfifo/ll8_to_fifo36.v b/usrp2/control_lib/newfifo/ll8_to_fifo36.v new file mode 100644 index 000000000..108daa903 --- /dev/null +++ b/usrp2/control_lib/newfifo/ll8_to_fifo36.v @@ -0,0 +1,97 @@ + +module ll8_to_fifo36 + (input clk, input reset, input clear, + input [7:0] ll_data, + input ll_sof_n, + input ll_eof_n, + input ll_src_rdy_n, + output ll_dst_rdy_n, + + output [35:0] f36_data, + output f36_src_rdy_o, + input f36_dst_rdy_i ); + + wire f36_write = f36_src_rdy_o & f36_dst_rdy_i; + + // Why anybody would use active low in an FPGA is beyond me... + wire ll_sof = ~ll_sof_n; + wire ll_eof = ~ll_eof_n; + wire ll_src_rdy = ~ll_src_rdy_n; + wire ll_dst_rdy; + assign ll_dst_rdy_n = ~ll_dst_rdy; + + reg f36_sof, f36_eof; + reg [1:0] f36_occ; + + + reg [2:0] state; + reg [7:0] dat0, dat1, dat2, dat3; + + always @(posedge clk) + if(ll_src_rdy & ((state==0)|f36_write)) + f36_sof <= ll_sof; + + always @(posedge clk) + if(ll_src_rdy & ((state !=4)|f36_write)) + f36_eof <= ll_eof; + + always @(posedge clk) + if(ll_eof) + f36_occ <= state[1:0] + 1; + else + f36_occ <= 0; + + always @(posedge clk) + if(reset) + state <= 0; + else + if(ll_src_rdy) + case(state) + 0 : + if(ll_eof) + state <= 4; + else + state <= 1; + 1 : + if(ll_eof) + state <= 4; + else + state <= 2; + 2 : + if(ll_eof) + state <= 4; + else + state <= 3; + 3 : state <= 4; + 4 : + if(f36_dst_rdy_i) + if(ll_eof) + state <= 4; + else + state <= 1; + endcase // case(state) + else + if(f36_write) + state <= 0; + + always @(posedge clk) + if(ll_src_rdy & (state==3)) + dat3 <= ll_data; + + always @(posedge clk) + if(ll_src_rdy & (state==2)) + dat2 <= ll_data; + + always @(posedge clk) + if(ll_src_rdy & (state==1)) + dat1 <= ll_data; + + always @(posedge clk) + if(ll_src_rdy & ((state==0) | f36_write)) + dat0 <= ll_data; + + assign ll_dst_rdy = f36_dst_rdy_i | (state != 4); + assign f36_data = {f36_occ,f36_eof,f36_sof,dat0,dat1,dat2,dat3}; // FIXME endianess + assign f36_src_rdy_o = (state == 4); + +endmodule // ll8_to_fifo36 |