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Diffstat (limited to 'fpga/usrp2/fifo/buffer_pool.v')
| -rw-r--r-- | fpga/usrp2/fifo/buffer_pool.v | 300 |
1 files changed, 300 insertions, 0 deletions
diff --git a/fpga/usrp2/fifo/buffer_pool.v b/fpga/usrp2/fifo/buffer_pool.v new file mode 100644 index 000000000..48f5bd69c --- /dev/null +++ b/fpga/usrp2/fifo/buffer_pool.v @@ -0,0 +1,300 @@ +// +// Copyright 2011 Ettus Research LLC +// +// This program is free software: you can redistribute it and/or modify +// it under the terms of the GNU General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. +// +// You should have received a copy of the GNU General Public License +// along with this program. If not, see <http://www.gnu.org/licenses/>. +// + + +// 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 |