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author | matt <matt@221aa14e-8319-0410-a670-987f0aec2ac5> | 2009-03-30 02:54:51 +0000 |
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committer | matt <matt@221aa14e-8319-0410-a670-987f0aec2ac5> | 2009-03-30 02:54:51 +0000 |
commit | a4b5b6839293b624e66a5fbcbc6bb822cadfb3b5 (patch) | |
tree | d18e7db5445e9f029711e3eb8468be666efdf12e /control_lib/newfifo | |
parent | 9e643a57af8f84f6008607d0554896d0206c7cf5 (diff) | |
download | uhd-a4b5b6839293b624e66a5fbcbc6bb822cadfb3b5.tar.gz uhd-a4b5b6839293b624e66a5fbcbc6bb822cadfb3b5.tar.bz2 uhd-a4b5b6839293b624e66a5fbcbc6bb822cadfb3b5.zip |
new fifos copied over from other project
git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@10709 221aa14e-8319-0410-a670-987f0aec2ac5
Diffstat (limited to 'control_lib/newfifo')
-rw-r--r-- | control_lib/newfifo/fifo18_to_ll8.v | 58 | ||||
-rw-r--r-- | control_lib/newfifo/fifo19_to_fifo36.v | 71 | ||||
-rw-r--r-- | control_lib/newfifo/fifo19_to_ll8.v | 53 | ||||
-rw-r--r-- | control_lib/newfifo/fifo36_to_fifo18.v | 40 | ||||
-rw-r--r-- | control_lib/newfifo/fifo36_to_fifo19.v | 41 | ||||
-rw-r--r-- | control_lib/newfifo/fifo36_to_ll8.v | 60 | ||||
-rw-r--r-- | control_lib/newfifo/fifo_2clock.v | 66 | ||||
-rw-r--r-- | control_lib/newfifo/fifo_2clock_casc.v | 31 | ||||
-rw-r--r-- | control_lib/newfifo/fifo_cascade.v | 52 | ||||
-rw-r--r-- | control_lib/newfifo/fifo_long.v | 148 | ||||
-rw-r--r-- | control_lib/newfifo/fifo_new_tb.v | 158 | ||||
-rw-r--r-- | control_lib/newfifo/fifo_new_tb.vcd | 5506 | ||||
-rw-r--r-- | control_lib/newfifo/fifo_short.v | 95 | ||||
-rw-r--r-- | control_lib/newfifo/fifo_spec.txt | 36 | ||||
-rw-r--r-- | control_lib/newfifo/fifo_tb.v | 155 | ||||
-rw-r--r-- | control_lib/newfifo/ll8_to_fifo19.v | 77 | ||||
-rw-r--r-- | control_lib/newfifo/ll8_to_fifo36.v | 94 |
17 files changed, 6741 insertions, 0 deletions
diff --git a/control_lib/newfifo/fifo18_to_ll8.v b/control_lib/newfifo/fifo18_to_ll8.v new file mode 100644 index 000000000..4653244ef --- /dev/null +++ b/control_lib/newfifo/fifo18_to_ll8.v @@ -0,0 +1,58 @@ + +module fifo18_to_ll8 + (input clk, input reset, input clear, + input [35:0] f18_data, + input f18_src_rdy_i, + output f18_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 f18_sof = f18_data[32]; + wire f18_eof = f18_data[33]; + wire f18_occ = f18_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 = f18_data[31:24]; + 1 : ll_data = f18_data[23:16]; + 2 : ll_data = f18_data[15:8]; + 3 : ll_data = f18_data[7:0]; + default : ll_data = f18_data[31:24]; + endcase // case (state) + + assign ll_sof = (state==0) & f18_sof; + assign ll_eof = f18_eof & (((state==0)&(f18_occ==1)) | + ((state==1)&(f18_occ==2)) | + ((state==2)&(f18_occ==3)) | + (state==3)); + + assign ll_src_rdy = f18_src_rdy_i; + + assign advance = ll_src_rdy & ll_dst_rdy; + assign f18_dst_rdy_o = advance & ((state==3)|ll_eof); + assign debug = state; + +endmodule // ll8_to_fifo36 diff --git a/control_lib/newfifo/fifo19_to_fifo36.v b/control_lib/newfifo/fifo19_to_fifo36.v new file mode 100644 index 000000000..e22ca0a49 --- /dev/null +++ b/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/control_lib/newfifo/fifo19_to_ll8.v b/control_lib/newfifo/fifo19_to_ll8.v new file mode 100644 index 000000000..4707f7523 --- /dev/null +++ b/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/control_lib/newfifo/fifo36_to_fifo18.v b/control_lib/newfifo/fifo36_to_fifo18.v new file mode 100644 index 000000000..b636ab9ca --- /dev/null +++ b/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/control_lib/newfifo/fifo36_to_fifo19.v b/control_lib/newfifo/fifo36_to_fifo19.v new file mode 100644 index 000000000..de249aaeb --- /dev/null +++ b/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/control_lib/newfifo/fifo36_to_ll8.v b/control_lib/newfifo/fifo36_to_ll8.v new file mode 100644 index 000000000..1befb9e6e --- /dev/null +++ b/control_lib/newfifo/fifo36_to_ll8.v @@ -0,0 +1,60 @@ + +module fifo36_to_ll8 + (input clk, reset, + 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/control_lib/newfifo/fifo_2clock.v b/control_lib/newfifo/fifo_2clock.v new file mode 100644 index 000000000..6b1eb607e --- /dev/null +++ b/control_lib/newfifo/fifo_2clock.v @@ -0,0 +1,66 @@ + +module fifo_2clock + #(parameter DWIDTH=32, AWIDTH=9) + (input wclk, input [DWIDTH-1:0] datain, input write, output full, output reg [AWIDTH-1:0] level_wclk, + input rclk, output [DWIDTH-1:0] dataout, input read, output empty, output reg [AWIDTH-1:0] level_rclk, + input arst); + + 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; + +endmodule // fifo_2clock diff --git a/control_lib/newfifo/fifo_2clock_casc.v b/control_lib/newfifo/fifo_2clock_casc.v new file mode 100644 index 000000000..e9b0cfc25 --- /dev/null +++ b/control_lib/newfifo/fifo_2clock_casc.v @@ -0,0 +1,31 @@ + +module fifo_2clock_casc + #(parameter DWIDTH=32, AWIDTH=9) + (input wclk, input [DWIDTH-1:0] datain, input write, output full, output [AWIDTH-1:0] level_wclk, + input rclk, output [DWIDTH-1:0] dataout, input read, output empty, output [AWIDTH-1:0] level_rclk, + input arst); + + wire full_int, empty_int, full_int2, empty_int2, transfer, transfer2; + wire [DWIDTH-1:0] data_int, data_int2; + + shortfifo #(.WIDTH(DWIDTH)) shortfifo + (.clk(wclk), .rst(arst), .clear(0), + .datain(datain), .write(write), .full(full), + .dataout(data_int), .read(transfer), .empty(empty_int) ); + + assign transfer = ~full_int & ~empty_int; + + fifo_2clock #(.DWIDTH(DWIDTH),.AWIDTH(AWIDTH)) fifo_2clock + (.wclk(wclk), .datain(data_int), .write(transfer), .full(full_int), .level_wclk(level_wclk), + .rclk(rclk), .dataout(data_int2), .read(transfer2), .empty(empty_int2), .level_rclk(level_rclk), + .arst(arst) ); + + assign transfer2 = ~full_int2 & ~empty_int2; + + shortfifo #(.WIDTH(DWIDTH)) shortfifo2 + (.clk(rclk), .rst(arst), .clear(0), + .datain(data_int2), .write(transfer2), .full(full_int2), + .dataout(dataout), .read(read), .empty(empty) ); + +endmodule // fifo_2clock_casc + diff --git a/control_lib/newfifo/fifo_cascade.v b/control_lib/newfifo/fifo_cascade.v new file mode 100644 index 000000000..fdd8449bc --- /dev/null +++ b/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/control_lib/newfifo/fifo_long.v b/control_lib/newfifo/fifo_long.v new file mode 100644 index 000000000..0426779f6 --- /dev/null +++ b/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/control_lib/newfifo/fifo_new_tb.v b/control_lib/newfifo/fifo_new_tb.v new file mode 100644 index 000000000..f561df7fa --- /dev/null +++ b/control_lib/newfifo/fifo_new_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 $finish; +endmodule // longfifo_tb diff --git a/control_lib/newfifo/fifo_new_tb.vcd b/control_lib/newfifo/fifo_new_tb.vcd new file mode 100644 index 000000000..796889e7d --- /dev/null +++ b/control_lib/newfifo/fifo_new_tb.vcd @@ -0,0 +1,5506 @@ +$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 $" +x#" +0"" +x!" +x~ +x} +x| +b0 { +xz +0y +xx +xw +xv +xu +b0 t +xs +0r +xq +xp +xo +xn +b0 m +xl +0k +xj +xi +xh +xg +b0 f +xe +0d +xc +xb +xa +x` +b0 _ +x^ +0] +x\ +x[ +xZ +xY +b0 X +xW +0V +xU +xT +xS +xR +b0 Q +xP +0O +xN +xM +xL +xK +bx J +bx I +xH +xG +bx F +0E +0D +1C +xB +bx A +b0 @ +0? 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+#14600000000000000 +04 +0? +#14650000000000000 +1.$ +1' +b11110111 ?$ +b11110111 . +b11110111 B$ +0G$ +1T$ +1@$ +b1 M$ +0+ +b11100111 H$ +b1110011110110110 ) +b1110011110110110 A$ +b1110011110110110 N$ +b10 Z$ +1- +b1010011010110110 V$ +b11100110111101101010011010110110 , +b11100110111101101010011010110110 R$ +14 +1? +#14700000000000000 +04 +0? +#14750000000000000 +0.$ +03$ +0B +0' +0$ +0T$ +1G$ +b10100111 ?$ +b10100111 . +b10100111 B$ +b1010011110110111 & +b1010011110110111 -$ +b1010011110110111 7$ +b0 Z$ +0- +b11110111 I$ +b1110011111110111 ) +b1110011111110111 A$ +b1110011111110111 N$ +b10 M$ +1+ +0@$ +15$ +14 +1? +#14800000000000000 +04 +0? +#14850000000000000 +13$ +1B +1.$ +1$ +1' +b10110111 ?$ +b10110111 . +b10110111 B$ +0G$ +1@$ +b1 M$ +0+ +b10100111 H$ +b1010011111110111 ) +b1010011111110111 A$ +b1010011111110111 N$ +b1 Z$ +b1110011111110111 U$ +b11100111111101111010011010110110 , +b11100111111101111010011010110110 R$ +14 +1? +#14900000000000000 +04 +0? +#14950000000000000 +0.$ +03$ +0B +0' +0$ +10$ +1G$ +b11101000 ?$ +b11101000 . +b11101000 B$ +b1110100011111000 & +b1110100011111000 -$ +b1110100011111000 7$ +0K +0P +0R +0W +0Y +0^ +0` +1e +0g +0n +0u +0| +0%" +0*" +0," +01" +03" +08" +0:" +1?" +0A" +0H" +0O" +0V" +0]" +0b" +0d" +0i" +0k" +0p" +0r" +1w" +0y" +0"# +0)# +00# +07# +0<# +0># +0C# +0E# +0J# +0L# +1Q# +0S# +0Z# +0a# +0h# +0o# +0v# +1{# +b1011101000111110001010100010111000 # +b1011101000111110001010100010111000 A +b1011101000111110001010100010111000 /$ +0}# +0&$ +b10110111 I$ +b1010011110110111 ) +b1010011110110111 A$ +b1010011110110111 N$ +b10 M$ +1+ +0@$ +05$ +b1 I +b1111 J +b0 F +14 +1? +#15000000000000000 +04 +0? +#15050000000000000 +1.$ +1' +b11111000 ?$ +b11111000 . +b11111000 B$ +0G$ +1T$ +1@$ +b1 M$ +0+ +b11101000 H$ +b1110100010110111 ) +b1110100010110111 A$ +b1110100010110111 N$ +b10 Z$ +1- +b1010011110110111 V$ +b11100111111101111010011110110111 , +b11100111111101111010011110110111 R$ +14 +1? +#15100000000000000 +04 +0? +#15150000000000000 +0.$ +03$ +0B +0' +18$ +0$ +0T$ +1G$ +b10101000 ?$ +b10101000 . +b10101000 B$ +b101010100010111000 & +b101010100010111000 -$ +b101010100010111000 7$ +b0 Z$ +0- +b11111000 I$ +b1110100011111000 ) +b1110100011111000 A$ +b1110100011111000 N$ +b10 M$ +1+ +0@$ +15$ +14 +1? +#15200000000000000 +04 +0? +#15250000000000000 +1D$ +13$ +1B +00 +1.$ +1$ +1<$ +1' +b10111000 ?$ +b10111000 . +b10111000 B$ +0G$ +1@$ +b1 M$ +0+ +b10101000 H$ +b1010100011111000 ) +b1010100011111000 A$ +b1010100011111000 N$ +b1 Z$ +b1110100011111000 U$ +b11101000111110001010011110110111 , +b11101000111110001010011110110111 R$ +14 +1? +#15300000000000000 +04 +0? +#15350000000000000 +0D$ +10 +0' +0F$ +0<$ +08$ +0$ +0.$ +06$ +12 +03$ +0B +1G$ +1O$ +b11101000 ?$ +b11101000 . +b11101000 B$ +b1110100011111000 & +b1110100011111000 -$ +b1110100011111000 7$ +0>$ +0( +0% +b10111000 I$ +b10 M$ +1+ +1J$ +b101010100010111000 ) +b101010100010111000 A$ +b101010100010111000 N$ +0@$ +05$ +b0 I +b10000 J +1G +14 +1? +#15400000000000000 +04 +0? +#15450000000000000 +0G$ +1T$ +b0 M$ +0+ +1W$ +b10 Z$ +1- +b1010100010111000 V$ +b1011101000111110001010100010111000 , +b1011101000111110001010100010111000 R$ +14 +1? +#15500000000000000 +04 +0? +#15550000000000000 +0T$ +b0 Z$ +0- +14 +1? +#15600000000000000 +04 +0? +#15650000000000000 +14 +1? +#15700000000000000 +04 +0? +#15750000000000000 +14 +1? +#15800000000000000 +04 +0? +#15850000000000000 +14 +1? +#15900000000000000 +04 +0? +#15950000000000000 +14 +1? +#16000000000000000 +04 +0? +#16050000000000000 +14 +1? +#16100000000000000 +04 +0? +#16150000000000000 +14 +1? +#16200000000000000 +04 +0? +#16250000000000000 +14 +1? 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+#18100000000000000 +04 +0? +#18150000000000000 +14 +1? +#18200000000000000 +04 +0? +#18250000000000000 +14 +1? +#18300000000000000 +04 +0? +#18350000000000000 +14 +1? +#18400000000000000 +04 +0? +#18450000000000000 +14 +1? +#18500000000000000 +04 +0? +#18550000000000000 +14 +1? +#18600000000000000 +04 +0? +#18650000000000000 +14 +1? +#18700000000000000 +04 +0? +#18750000000000000 +14 +1? +#18800000000000000 +04 +0? +#18850000000000000 +14 +1? +#18900000000000000 +04 +0? +#18950000000000000 +14 +1? +#19000000000000000 +04 +0? +#19050000000000000 +14 +1? +#19100000000000000 +04 +0? +#19150000000000000 +14 +1? +#19200000000000000 +04 +0? +#19250000000000000 +14 +1? +#19300000000000000 +04 +0? +#19350000000000000 +14 +1? +#19400000000000000 +04 +0? +#19450000000000000 +14 +1? +#19500000000000000 +04 +0? +#19550000000000000 +14 +1? +#19600000000000000 +04 +0? +#19650000000000000 +14 +1? +#19700000000000000 +04 +0? +#19750000000000000 +14 +1? +#19800000000000000 +04 +0? +#19850000000000000 +14 +1? +#19900000000000000 +04 +0? +#19950000000000000 +14 +1? +#20000000000000000 +04 +0? diff --git a/control_lib/newfifo/fifo_short.v b/control_lib/newfifo/fifo_short.v new file mode 100644 index 000000000..53a7603c7 --- /dev/null +++ b/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/control_lib/newfifo/fifo_spec.txt b/control_lib/newfifo/fifo_spec.txt new file mode 100644 index 000000000..133b9fa8e --- /dev/null +++ b/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/control_lib/newfifo/fifo_tb.v b/control_lib/newfifo/fifo_tb.v new file mode 100644 index 000000000..98fd63f8d --- /dev/null +++ b/control_lib/newfifo/fifo_tb.v @@ -0,0 +1,155 @@ +module fifo_tb(); + + reg clk, rst; + wire short_full, short_empty, long_full, long_empty; + wire casc_full, casc_empty, casc2_full, casc2_empty; + reg read, write; + + wire [7:0] short_do, long_do; + wire [7:0] casc_do, casc2_do; + reg [7:0] di; + + reg clear = 0; + + shortfifo #(.WIDTH(8)) shortfifo + (.clk(clk),.rst(rst),.datain(di),.dataout(short_do),.clear(clear), + .read(read),.write(write),.full(short_full),.empty(short_empty)); + + longfifo #(.WIDTH(8), .SIZE(4)) longfifo + (.clk(clk),.rst(rst),.datain(di),.dataout(long_do),.clear(clear), + .read(read),.write(write),.full(long_full),.empty(long_empty)); + + cascadefifo #(.WIDTH(8), .SIZE(4)) cascadefifo + (.clk(clk),.rst(rst),.datain(di),.dataout(casc_do),.clear(clear), + .read(read),.write(write),.full(casc_full),.empty(casc_empty)); + + cascadefifo2 #(.WIDTH(8), .SIZE(4)) cascadefifo2 + (.clk(clk),.rst(rst),.datain(di),.dataout(casc2_do),.clear(clear), + .read(read),.write(write),.full(casc2_full),.empty(casc2_empty)); + + initial rst = 1; + initial #1000 rst = 0; + initial clk = 0; + always #50 clk = ~clk; + + initial di = 8'hAE; + initial read = 0; + initial write = 0; + + always @(posedge clk) + if(write) + di <= di + 1; + + always @(posedge clk) + begin + if(short_full != long_full) + $display("Error: FULL mismatch"); + if(short_empty != long_empty) + $display("Note: EMPTY mismatch, usually not a problem (longfifo has 2 cycle latency)"); + if(read & (short_do != long_do)) + $display("Error: DATA mismatch"); + end + + initial $dumpfile("fifo_tb.vcd"); + initial $dumpvars(0,fifo_tb); + + initial + begin + @(negedge rst); + @(posedge clk); + repeat (10) + @(posedge clk); + write <= 1; + @(posedge clk); + write <= 0; + @(posedge clk); + @(posedge clk); + @(posedge clk); + @(posedge clk); + @(posedge clk); + @(posedge clk); + @(posedge clk); + @(posedge clk); + read <= 1; + @(posedge clk); + read <= 0; + @(posedge clk); + @(posedge clk); + @(posedge clk); + @(posedge clk); + @(posedge clk); + + repeat(10) + begin + write <= 1; + @(posedge clk); + write <= 0; + @(posedge clk); + @(posedge clk); + @(posedge clk); + read <= 1; + @(posedge clk); + read <= 0; + @(posedge clk); + @(posedge clk); + @(posedge clk); + @(posedge clk); + @(posedge clk); + end // repeat (10) + + write <= 1; + repeat (4) + @(posedge clk); + write <= 0; + @(posedge clk); + read <= 1; + repeat (4) + @(posedge clk); + read <= 0; + @(posedge clk); + + + write <= 1; + repeat (4) + @(posedge clk); + write <= 0; + @(posedge clk); + repeat (4) + begin + read <= 1; + @(posedge clk); + read <= 0; + @(posedge clk); + end + + write <= 1; + @(posedge clk); + @(posedge clk); + @(posedge clk); + @(posedge clk); + read <= 1; + repeat (5) + @(posedge clk); + write <= 0; + @(posedge clk); + @(posedge clk); + read <= 0; + @(posedge clk); + + write <= 1; + repeat (16) + @(posedge clk); + write <= 0; + @(posedge clk); + + read <= 1; + repeat (16) + @(posedge clk); + read <= 0; + @(posedge clk); + + repeat (10) + @(posedge clk); + $finish; + end +endmodule // longfifo_tb diff --git a/control_lib/newfifo/ll8_to_fifo19.v b/control_lib/newfifo/ll8_to_fifo19.v new file mode 100644 index 000000000..c65be5136 --- /dev/null +++ b/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/control_lib/newfifo/ll8_to_fifo36.v b/control_lib/newfifo/ll8_to_fifo36.v new file mode 100644 index 000000000..0d772c45c --- /dev/null +++ b/control_lib/newfifo/ll8_to_fifo36.v @@ -0,0 +1,94 @@ + +module ll8_to_fifo36 + (input clk, reset, + 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_full = ~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]; + 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_full) + 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_full | (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 |