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Commit 270a7673 authored by Andrey Filippov's avatar Andrey Filippov
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Initial code for the FIS -> AXI FIFO module (read device DMA)

parent c11c0ad4
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utils/ahci_dma_wr_fifo.v
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......@@ -44,10 +44,11 @@ module ahci_dma_wr_fifo#(
output reg [3:0] dout_wstb, // word write enable (apply to wstb, 2 wstb input bits for one dout_wstb bit)
output reg done, // this PRD data sent AXI FIFO (Some partial QWORD data may be left in this module if
// last_prd was not set
output busy,
// output done_flush, // finished last PRD (indicated by last_prd @ start), data left module
// mclk domain
output [31:0] din,
input [31:0] din,
output din_rdy, // can accept data from HBA (multiple dwords, so reasonable latency is OK)
input din_avail
);
......@@ -60,13 +61,13 @@ module ahci_dma_wr_fifo#(
reg en_fifo_wr;
wire flush_hclk; // TODO: Define (less than 4 left to receive)?
wire flush_mclk;
wire flush_conf;
// wire flush_conf;
reg [ADDRESS_BITS : 0] raddr; // 1 extra bit
reg [ADDRESS_BITS+1:0] waddr; // 1 extra bit
reg [63:16] fifo_do_prev; // only 48 bits are needed
reg [(1<<ADDRESS_BITS)-1:0] fifo_full; // set in write clock domain
reg [(1<<ADDRESS_BITS)-1:0] fifo_nempty;// set in read clock domain
wire fifo_wr = (din_avail && din_rdy) || (waddr[0] && flush_mclk);
wire fifo_wr = (din_avail && din_rdy) || (waddr[0] && flush_mclk); // flush may add extra write of junk
// wire fifo_rd;
wire [(1<<ADDRESS_BITS)-1:0] fifo_full2 = {fifo_full[0],fifo_full[ADDRESS_NUM-1:1]};
reg hrst_mclk;
......@@ -74,6 +75,7 @@ module ahci_dma_wr_fifo#(
reg fifo_dav2; // @hclk
reg fifo_half_mclk; // Half Fifo is empty, OK to write
wire [63:0] fifo_do = {fifo1_ram [raddr[ADDRESS_BITS:1]], fifo0_ram [raddr[ADDRESS_BITS:1]]};
wire dout_we_w;
reg [1:0] dout_we_r;
reg [1:0] wp; // word pointer in the output (0..3)
......@@ -85,21 +87,55 @@ module ahci_dma_wr_fifo#(
reg [2:0] mx2; //6:1
reg [2:0] mx3; //7:1
reg [3:0] pm; // re_dout_wstb;
reg fifo_rd;
wire fifo_rd;
reg fifo_rd_r;
// reg [1:0] nwp; // Needed? 0 for all but first
reg [1:0] nfp; // next {fifo_do,fifo_do_prev} pointer (0 - fifo_do_prev[16], ..., 3 - fifo_do[0])
reg [2:0] swl; // subtract from words_left;
reg need_fifo; // needs reading fifo
// TODO: make separate register bits for wl == 0, wl > =4
reg busy_r;
reg is_last_prd;
reg [WCNT_BITS-1:0] wcntr;
wire [WCNT_BITS-1:0] next_wcntr = wcntr[WCNT_BITS-1:0] - swl[2:0];
reg flushing;
// wire done_w = dout_we_r[0] && !(next_wcntr[WCNT_BITS];
wire last_qword= !(|wcntr[WCNT_BITS-1:2]) &&
((wcntr[1:0] == 0) ||
swl[2] ||
(!wcntr[1] && swl[1]) ||
(!wcntr[0] && (&swl[1:0])) );
wire done_w = dout_we_w && last_qword;
wire axi_ready = dout_av && (dout_av_many || (!dout_we_r));
wire fifo_out_ready = en_fifo_rd && (!need_fifo || (fifo_dav && (fifo_dav2 || !fifo_rd_r)));
assign flush_hclk = is_last_prd && !flushing && !nfp[1] && last_qword && waddr[0]; // waddr[0] - other clock domain, but OK here,
// it was last 1->0 before previous FIFO read. flush_hclk will only be generated for odd number of dwords
assign din_rdy = en_fifo_wr && fifo_half_mclk;
assign dout_we = dout_we_r[1]; // dout_we_r[0] - write to dout, use dout_av && (!(|dout_we_r) || dout_av_many) to enable dout_we_r[0]<=
assign dout_we = dout_we_r[0]; // dout_we_r[0] - write to dout, use dout_av && (!(|dout_we_r) || dout_av_many) to enable dout_we_r[0]<=
assign busy = busy_r || dout_we_r[0];
assign dout_we_w = axi_ready && fifo_out_ready && busy_r;
assign fifo_rd = dout_we_w && need_fifo;
always @ (posedge hclk) begin
if (hrst || init) en_fifo_rd <= 0;
else if (init_confirm) en_fifo_rd <= 1;
else if (flush_conf) en_fifo_rd <= 0;
if (hrst || init) en_fifo_rd <= 0;
else if (init_confirm) en_fifo_rd <= 1;
else if (done_w && is_last_prd) en_fifo_rd <= 0;
done <= done_w;
fifo_rd_r <= fifo_rd;
if (hrst || init) raddr <= 0;
else if (fifo_rd) raddr <= raddr + 1;
// reg [ADDRESS_BITS : 0] raddr; // 1 extra bit
if (hrst || init) fifo_nempty <= {{(ADDRESS_NUM>>1){1'b0}},{(ADDRESS_NUM>>1){1'b1}}};// 8'b00001111
else if (fifo_rd && raddr[0]) fifo_nempty <= {fifo_nempty[ADDRESS_NUM-2:0],raddr[ADDRESS_BITS] ^ raddr[ADDRESS_BITS-1]};
......@@ -109,8 +145,94 @@ module ahci_dma_wr_fifo#(
fifo_dav2 <= !init && en_fifo_rd && (fifo_full2[raddr[ADDRESS_BITS:1]]);
if (fifo_rd) fifo_do_prev[63:16] <= fifo_do[63:16];
if (start) is_last_prd <= last_prd;
// flushing will only be set for the last dword in last PRD if total number of dwords is ODD.
// Odd number of words should be handled outside of this module (before)
if (hrst || init || start) flushing <= 0;
else if (flush_hclk) flushing <= 1;
else if (done_w) flushing <= 0;
if (hrst || init) busy_r <= 0;
else if (start) busy_r <= 1;
else if (done_w) busy_r <= 0;
dout_we_r <= {dout_we_r[0], dout_we_w};
if (start) wcntr <= wcnt;
else if (dout_we_w) wcntr <= next_wcntr; // wcntr - swl[2:0];
if (start) wp <= woffs;
else if (dout_we_w) wp <= 0; // all but possibly wirst QWORD are aligned to th low word
if (init) fp <= 3; // only reset for the first PRD, points to the beginning of the fifo_do (fifo_do_prev - empty)
else if (dout_we_w) fp <= nfp;
// words left: 0: 1 word, ..., 3: >=4 words
if (start) wl <= wcnt[1:0] | {2{|wcnt[WCNT_BITS-1:2]}};
else if (dout_we_w) wl <= next_wcntr[1:0] | {2{|wcntr[WCNT_BITS-1:3] | next_wcntr[2]}};
if (dout_we_w) begin
dout_wstb <= pm;
case (mx0)
2'h0: dout[15: 0] <= fifo_do_prev[31:16];
2'h1: dout[15: 0] <= fifo_do_prev[47:32];
2'h2: dout[15: 0] <= fifo_do_prev[63:48];
2'h3: dout[15: 0] <= fifo_do [15: 0];
endcase
case (mx1)
3'h0: dout[31:16] <= fifo_do_prev[31:16];
3'h1: dout[31:16] <= fifo_do_prev[47:32];
3'h2: dout[31:16] <= fifo_do_prev[63:48];
3'h3: dout[31:16] <= fifo_do [15: 0];
3'h4: dout[31:16] <= fifo_do [31:16];
default: dout[31:16] <= 16'bx; // should never get here
endcase
case (mx2)
3'h0: dout[47:32] <= fifo_do_prev[31:16];
3'h1: dout[47:32] <= fifo_do_prev[47:32];
3'h2: dout[47:32] <= fifo_do_prev[63:48];
3'h3: dout[47:32] <= fifo_do [15: 0];
3'h4: dout[47:32] <= fifo_do [31:16];
3'h5: dout[47:32] <= fifo_do [47:32];
default: dout[47:32] <= 16'bx; // should never get here
endcase
case (mx3)
3'h0: dout[63:48] <= fifo_do_prev[31:16];
3'h1: dout[63:48] <= fifo_do_prev[47:32];
3'h2: dout[63:48] <= fifo_do_prev[63:48];
3'h3: dout[63:48] <= fifo_do [15: 0];
3'h4: dout[63:48] <= fifo_do [31:16];
3'h5: dout[63:48] <= fifo_do [47:32];
3'h6: dout[63:48] <= fifo_do [63:48];
default: dout[63:48] <= 16'bx; // should never get here
endcase
end
end
/*
output reg [63:0] dout, // allow only each 3-rd wr if not many
input dout_av, // at least one QWORD space avaiable in AXI FIFO
input dout_av_many, // several QWORD space avaiable in AXI FIFO
input last_prd, // last prd, flush partial dword if there were odd number of words transferred. valid @ start
// Or maybe use "last_prd"?
output dout_we,
output reg [3:0] dout_wstb, // word write enable (apply to wstb, 2 wstb input bits for one dout_wstb bit)
output reg done, // this PRD data sent AXI FIFO (Some partial QWORD data may be left in this module if
wl3[2:0]
always @* case ({wp, fp, wl})
6'h00: begin mx0 <= 0; mx1 <= 1; mx2 <= 2; mx3 <= 3; pm <= 4'b0001; fifo_rd <= 0; nfp <= 1; swl <= 1; end
*/
// mclk domain
always @ (posedge mclk) begin
......@@ -169,7 +291,7 @@ module ahci_dma_wr_fifo#(
.out_pulse (init_confirm), // output
.busy() // output
);
/*
pulse_cross_clock #(
.EXTRA_DLY(0)
) flush_conf_i (
......@@ -180,7 +302,7 @@ module ahci_dma_wr_fifo#(
.out_pulse (flush_conf), // output
.busy() // output
);
*/
/*
wl: 0: left 1 word, 1: left 2 words, 2: left 3 words, 3: left >=4 words
wp (pointer in the output qword, only first in PRD can be non-zero) 0: word 0 of output QW, ...
......@@ -192,85 +314,85 @@ module ahci_dma_wr_fifo#(
*/
always @* case ({wp, fp, wl})
6'h00: begin mx0 <= 0; mx1 <= 1; mx2 <= 2; mx3 <= 3; pm <= 4'b0001; fifo_rd <= 0; nfp <= 1; swl <= 1; end
6'h01: begin mx0 <= 0; mx1 <= 1; mx2 <= 2; mx3 <= 3; pm <= 4'b0011; fifo_rd <= 0; nfp <= 2; swl <= 2; end
6'h02: begin mx0 <= 0; mx1 <= 1; mx2 <= 2; mx3 <= 3; pm <= 4'b0111; fifo_rd <= 0; nfp <= 3; swl <= 3; end
6'h03: begin mx0 <= 0; mx1 <= 1; mx2 <= 2; mx3 <= 3; pm <= 4'b1111; fifo_rd <= 1; nfp <= 0; swl <= 4; end
6'h04: begin mx0 <= 1; mx1 <= 2; mx2 <= 3; mx3 <= 4; pm <= 4'b0001; fifo_rd <= 0; nfp <= 2; swl <= 1; end
6'h05: begin mx0 <= 1; mx1 <= 2; mx2 <= 3; mx3 <= 4; pm <= 4'b0011; fifo_rd <= 0; nfp <= 3; swl <= 2; end
6'h06: begin mx0 <= 1; mx1 <= 2; mx2 <= 3; mx3 <= 4; pm <= 4'b0111; fifo_rd <= 1; nfp <= 0; swl <= 3; end
6'h07: begin mx0 <= 1; mx1 <= 2; mx2 <= 3; mx3 <= 4; pm <= 4'b1111; fifo_rd <= 1; nfp <= 1; swl <= 4; end
6'h08: begin mx0 <= 2; mx1 <= 3; mx2 <= 4; mx3 <= 5; pm <= 4'b0001; fifo_rd <= 0; nfp <= 3; swl <= 1; end
6'h09: begin mx0 <= 2; mx1 <= 3; mx2 <= 4; mx3 <= 5; pm <= 4'b0011; fifo_rd <= 1; nfp <= 0; swl <= 2; end
6'h0a: begin mx0 <= 2; mx1 <= 3; mx2 <= 4; mx3 <= 5; pm <= 4'b0111; fifo_rd <= 1; nfp <= 1; swl <= 3; end
6'h0b: begin mx0 <= 2; mx1 <= 3; mx2 <= 4; mx3 <= 5; pm <= 4'b1111; fifo_rd <= 1; nfp <= 2; swl <= 4; end
6'h0c: begin mx0 <= 3; mx1 <= 4; mx2 <= 5; mx3 <= 6; pm <= 4'b0001; fifo_rd <= 1; nfp <= 0; swl <= 1; end
6'h0d: begin mx0 <= 3; mx1 <= 4; mx2 <= 5; mx3 <= 6; pm <= 4'b0011; fifo_rd <= 1; nfp <= 1; swl <= 2; end
6'h0e: begin mx0 <= 3; mx1 <= 4; mx2 <= 5; mx3 <= 6; pm <= 4'b0111; fifo_rd <= 1; nfp <= 2; swl <= 3; end
6'h0f: begin mx0 <= 3; mx1 <= 4; mx2 <= 5; mx3 <= 6; pm <= 4'b1111; fifo_rd <= 1; nfp <= 3; swl <= 4; end
6'h10: begin mx0 <= 0; mx1 <= 0; mx2 <= 1; mx3 <= 2; pm <= 4'b0010; fifo_rd <= 0; nfp <= 1; swl <= 1; end
6'h11: begin mx0 <= 0; mx1 <= 0; mx2 <= 1; mx3 <= 2; pm <= 4'b0110; fifo_rd <= 0; nfp <= 2; swl <= 2; end
6'h12: begin mx0 <= 0; mx1 <= 0; mx2 <= 1; mx3 <= 2; pm <= 4'b1110; fifo_rd <= 0; nfp <= 3; swl <= 3; end
6'h13: begin mx0 <= 0; mx1 <= 0; mx2 <= 1; mx3 <= 2; pm <= 4'b1110; fifo_rd <= 0; nfp <= 3; swl <= 3; end
6'h14: begin mx0 <= 0; mx1 <= 1; mx2 <= 2; mx3 <= 3; pm <= 4'b0010; fifo_rd <= 0; nfp <= 2; swl <= 1; end
6'h15: begin mx0 <= 0; mx1 <= 1; mx2 <= 2; mx3 <= 3; pm <= 4'b0110; fifo_rd <= 0; nfp <= 3; swl <= 2; end
6'h16: begin mx0 <= 0; mx1 <= 1; mx2 <= 2; mx3 <= 3; pm <= 4'b1110; fifo_rd <= 1; nfp <= 0; swl <= 3; end
6'h17: begin mx0 <= 0; mx1 <= 1; mx2 <= 2; mx3 <= 3; pm <= 4'b1110; fifo_rd <= 1; nfp <= 0; swl <= 3; end
6'h18: begin mx0 <= 1; mx1 <= 2; mx2 <= 3; mx3 <= 4; pm <= 4'b0010; fifo_rd <= 0; nfp <= 3; swl <= 1; end
6'h19: begin mx0 <= 1; mx1 <= 2; mx2 <= 3; mx3 <= 4; pm <= 4'b0110; fifo_rd <= 1; nfp <= 0; swl <= 2; end
6'h1a: begin mx0 <= 1; mx1 <= 2; mx2 <= 3; mx3 <= 4; pm <= 4'b1110; fifo_rd <= 1; nfp <= 1; swl <= 3; end
6'h1b: begin mx0 <= 1; mx1 <= 2; mx2 <= 3; mx3 <= 4; pm <= 4'b1110; fifo_rd <= 1; nfp <= 1; swl <= 3; end
6'h00: begin mx0 <= 0; mx1 <= 1; mx2 <= 2; mx3 <= 3; pm <= 4'b0001; need_fifo <= 0; nfp <= 1; swl <= 1; end
6'h01: begin mx0 <= 0; mx1 <= 1; mx2 <= 2; mx3 <= 3; pm <= 4'b0011; need_fifo <= 0; nfp <= 2; swl <= 2; end
6'h02: begin mx0 <= 0; mx1 <= 1; mx2 <= 2; mx3 <= 3; pm <= 4'b0111; need_fifo <= 0; nfp <= 3; swl <= 3; end
6'h03: begin mx0 <= 0; mx1 <= 1; mx2 <= 2; mx3 <= 3; pm <= 4'b1111; need_fifo <= 1; nfp <= 0; swl <= 4; end
6'h04: begin mx0 <= 1; mx1 <= 2; mx2 <= 3; mx3 <= 4; pm <= 4'b0001; need_fifo <= 0; nfp <= 2; swl <= 1; end
6'h05: begin mx0 <= 1; mx1 <= 2; mx2 <= 3; mx3 <= 4; pm <= 4'b0011; need_fifo <= 0; nfp <= 3; swl <= 2; end
6'h06: begin mx0 <= 1; mx1 <= 2; mx2 <= 3; mx3 <= 4; pm <= 4'b0111; need_fifo <= 1; nfp <= 0; swl <= 3; end
6'h07: begin mx0 <= 1; mx1 <= 2; mx2 <= 3; mx3 <= 4; pm <= 4'b1111; need_fifo <= 1; nfp <= 1; swl <= 4; end
6'h08: begin mx0 <= 2; mx1 <= 3; mx2 <= 4; mx3 <= 5; pm <= 4'b0001; need_fifo <= 0; nfp <= 3; swl <= 1; end
6'h09: begin mx0 <= 2; mx1 <= 3; mx2 <= 4; mx3 <= 5; pm <= 4'b0011; need_fifo <= 1; nfp <= 0; swl <= 2; end
6'h0a: begin mx0 <= 2; mx1 <= 3; mx2 <= 4; mx3 <= 5; pm <= 4'b0111; need_fifo <= 1; nfp <= 1; swl <= 3; end
6'h0b: begin mx0 <= 2; mx1 <= 3; mx2 <= 4; mx3 <= 5; pm <= 4'b1111; need_fifo <= 1; nfp <= 2; swl <= 4; end
6'h0c: begin mx0 <= 3; mx1 <= 4; mx2 <= 5; mx3 <= 6; pm <= 4'b0001; need_fifo <= 1; nfp <= 0; swl <= 1; end
6'h0d: begin mx0 <= 3; mx1 <= 4; mx2 <= 5; mx3 <= 6; pm <= 4'b0011; need_fifo <= 1; nfp <= 1; swl <= 2; end
6'h0e: begin mx0 <= 3; mx1 <= 4; mx2 <= 5; mx3 <= 6; pm <= 4'b0111; need_fifo <= 1; nfp <= 2; swl <= 3; end
6'h0f: begin mx0 <= 3; mx1 <= 4; mx2 <= 5; mx3 <= 6; pm <= 4'b1111; need_fifo <= 1; nfp <= 3; swl <= 4; end
6'h10: begin mx0 <= 0; mx1 <= 0; mx2 <= 1; mx3 <= 2; pm <= 4'b0010; need_fifo <= 0; nfp <= 1; swl <= 1; end
6'h11: begin mx0 <= 0; mx1 <= 0; mx2 <= 1; mx3 <= 2; pm <= 4'b0110; need_fifo <= 0; nfp <= 2; swl <= 2; end
6'h12: begin mx0 <= 0; mx1 <= 0; mx2 <= 1; mx3 <= 2; pm <= 4'b1110; need_fifo <= 0; nfp <= 3; swl <= 3; end
6'h13: begin mx0 <= 0; mx1 <= 0; mx2 <= 1; mx3 <= 2; pm <= 4'b1110; need_fifo <= 0; nfp <= 3; swl <= 3; end
6'h14: begin mx0 <= 0; mx1 <= 1; mx2 <= 2; mx3 <= 3; pm <= 4'b0010; need_fifo <= 0; nfp <= 2; swl <= 1; end
6'h15: begin mx0 <= 0; mx1 <= 1; mx2 <= 2; mx3 <= 3; pm <= 4'b0110; need_fifo <= 0; nfp <= 3; swl <= 2; end
6'h16: begin mx0 <= 0; mx1 <= 1; mx2 <= 2; mx3 <= 3; pm <= 4'b1110; need_fifo <= 1; nfp <= 0; swl <= 3; end
6'h17: begin mx0 <= 0; mx1 <= 1; mx2 <= 2; mx3 <= 3; pm <= 4'b1110; need_fifo <= 1; nfp <= 0; swl <= 3; end
6'h18: begin mx0 <= 1; mx1 <= 2; mx2 <= 3; mx3 <= 4; pm <= 4'b0010; need_fifo <= 0; nfp <= 3; swl <= 1; end
6'h19: begin mx0 <= 1; mx1 <= 2; mx2 <= 3; mx3 <= 4; pm <= 4'b0110; need_fifo <= 1; nfp <= 0; swl <= 2; end
6'h1a: begin mx0 <= 1; mx1 <= 2; mx2 <= 3; mx3 <= 4; pm <= 4'b1110; need_fifo <= 1; nfp <= 1; swl <= 3; end
6'h1b: begin mx0 <= 1; mx1 <= 2; mx2 <= 3; mx3 <= 4; pm <= 4'b1110; need_fifo <= 1; nfp <= 1; swl <= 3; end
6'h1c: begin mx0 <= 2; mx1 <= 3; mx2 <= 4; mx3 <= 5; pm <= 4'b0010; fifo_rd <= 1; nfp <= 0; swl <= 1; end
6'h1d: begin mx0 <= 2; mx1 <= 3; mx2 <= 4; mx3 <= 5; pm <= 4'b0110; fifo_rd <= 1; nfp <= 1; swl <= 2; end
6'h1e: begin mx0 <= 2; mx1 <= 3; mx2 <= 4; mx3 <= 5; pm <= 4'b1110; fifo_rd <= 1; nfp <= 2; swl <= 3; end
6'h1f: begin mx0 <= 2; mx1 <= 3; mx2 <= 4; mx3 <= 5; pm <= 4'b1110; fifo_rd <= 1; nfp <= 2; swl <= 3; end
6'h1c: begin mx0 <= 2; mx1 <= 3; mx2 <= 4; mx3 <= 5; pm <= 4'b0010; need_fifo <= 1; nfp <= 0; swl <= 1; end
6'h1d: begin mx0 <= 2; mx1 <= 3; mx2 <= 4; mx3 <= 5; pm <= 4'b0110; need_fifo <= 1; nfp <= 1; swl <= 2; end
6'h1e: begin mx0 <= 2; mx1 <= 3; mx2 <= 4; mx3 <= 5; pm <= 4'b1110; need_fifo <= 1; nfp <= 2; swl <= 3; end
6'h1f: begin mx0 <= 2; mx1 <= 3; mx2 <= 4; mx3 <= 5; pm <= 4'b1110; need_fifo <= 1; nfp <= 2; swl <= 3; end
6'h20: begin mx0 <= 0; mx1 <= 0; mx2 <= 0; mx3 <= 1; pm <= 4'b0100; fifo_rd <= 0; nfp <= 1; swl <= 1; end
6'h21: begin mx0 <= 0; mx1 <= 0; mx2 <= 0; mx3 <= 1; pm <= 4'b1100; fifo_rd <= 0; nfp <= 2; swl <= 2; end
6'h22: begin mx0 <= 0; mx1 <= 0; mx2 <= 0; mx3 <= 1; pm <= 4'b1100; fifo_rd <= 0; nfp <= 2; swl <= 2; end
6'h23: begin mx0 <= 0; mx1 <= 0; mx2 <= 0; mx3 <= 1; pm <= 4'b1100; fifo_rd <= 0; nfp <= 2; swl <= 2; end
6'h24: begin mx0 <= 0; mx1 <= 0; mx2 <= 1; mx3 <= 2; pm <= 4'b0100; fifo_rd <= 0; nfp <= 2; swl <= 1; end
6'h25: begin mx0 <= 0; mx1 <= 0; mx2 <= 1; mx3 <= 2; pm <= 4'b1100; fifo_rd <= 0; nfp <= 3; swl <= 2; end
6'h26: begin mx0 <= 0; mx1 <= 0; mx2 <= 1; mx3 <= 2; pm <= 4'b1100; fifo_rd <= 0; nfp <= 3; swl <= 2; end
6'h27: begin mx0 <= 0; mx1 <= 0; mx2 <= 1; mx3 <= 2; pm <= 4'b1100; fifo_rd <= 0; nfp <= 3; swl <= 2; end
6'h28: begin mx0 <= 0; mx1 <= 1; mx2 <= 2; mx3 <= 3; pm <= 4'b0100; fifo_rd <= 0; nfp <= 3; swl <= 1; end
6'h29: begin mx0 <= 0; mx1 <= 1; mx2 <= 2; mx3 <= 3; pm <= 4'b1100; fifo_rd <= 1; nfp <= 0; swl <= 2; end
6'h2a: begin mx0 <= 0; mx1 <= 1; mx2 <= 2; mx3 <= 3; pm <= 4'b1100; fifo_rd <= 1; nfp <= 0; swl <= 2; end
6'h2b: begin mx0 <= 0; mx1 <= 1; mx2 <= 2; mx3 <= 3; pm <= 4'b1100; fifo_rd <= 1; nfp <= 0; swl <= 2; end
6'h2c: begin mx0 <= 1; mx1 <= 2; mx2 <= 3; mx3 <= 4; pm <= 4'b0100; fifo_rd <= 1; nfp <= 0; swl <= 1; end
6'h2d: begin mx0 <= 1; mx1 <= 2; mx2 <= 3; mx3 <= 4; pm <= 4'b1100; fifo_rd <= 1; nfp <= 1; swl <= 2; end
6'h2e: begin mx0 <= 1; mx1 <= 2; mx2 <= 3; mx3 <= 4; pm <= 4'b1100; fifo_rd <= 1; nfp <= 1; swl <= 2; end
6'h2f: begin mx0 <= 1; mx1 <= 2; mx2 <= 3; mx3 <= 4; pm <= 4'b1100; fifo_rd <= 1; nfp <= 1; swl <= 2; end
6'h30: begin mx0 <= 0; mx1 <= 0; mx2 <= 0; mx3 <= 0; pm <= 4'b1000; fifo_rd <= 0; nfp <= 1; swl <= 1; end
6'h31: begin mx0 <= 0; mx1 <= 0; mx2 <= 0; mx3 <= 0; pm <= 4'b1000; fifo_rd <= 0; nfp <= 1; swl <= 1; end
6'h32: begin mx0 <= 0; mx1 <= 0; mx2 <= 0; mx3 <= 0; pm <= 4'b1000; fifo_rd <= 0; nfp <= 1; swl <= 1; end
6'h33: begin mx0 <= 0; mx1 <= 0; mx2 <= 0; mx3 <= 0; pm <= 4'b1000; fifo_rd <= 0; nfp <= 1; swl <= 1; end
6'h20: begin mx0 <= 0; mx1 <= 0; mx2 <= 0; mx3 <= 1; pm <= 4'b0100; need_fifo <= 0; nfp <= 1; swl <= 1; end
6'h21: begin mx0 <= 0; mx1 <= 0; mx2 <= 0; mx3 <= 1; pm <= 4'b1100; need_fifo <= 0; nfp <= 2; swl <= 2; end
6'h22: begin mx0 <= 0; mx1 <= 0; mx2 <= 0; mx3 <= 1; pm <= 4'b1100; need_fifo <= 0; nfp <= 2; swl <= 2; end
6'h23: begin mx0 <= 0; mx1 <= 0; mx2 <= 0; mx3 <= 1; pm <= 4'b1100; need_fifo <= 0; nfp <= 2; swl <= 2; end
6'h24: begin mx0 <= 0; mx1 <= 0; mx2 <= 1; mx3 <= 2; pm <= 4'b0100; need_fifo <= 0; nfp <= 2; swl <= 1; end
6'h25: begin mx0 <= 0; mx1 <= 0; mx2 <= 1; mx3 <= 2; pm <= 4'b1100; need_fifo <= 0; nfp <= 3; swl <= 2; end
6'h26: begin mx0 <= 0; mx1 <= 0; mx2 <= 1; mx3 <= 2; pm <= 4'b1100; need_fifo <= 0; nfp <= 3; swl <= 2; end
6'h27: begin mx0 <= 0; mx1 <= 0; mx2 <= 1; mx3 <= 2; pm <= 4'b1100; need_fifo <= 0; nfp <= 3; swl <= 2; end
6'h28: begin mx0 <= 0; mx1 <= 1; mx2 <= 2; mx3 <= 3; pm <= 4'b0100; need_fifo <= 0; nfp <= 3; swl <= 1; end
6'h29: begin mx0 <= 0; mx1 <= 1; mx2 <= 2; mx3 <= 3; pm <= 4'b1100; need_fifo <= 1; nfp <= 0; swl <= 2; end
6'h2a: begin mx0 <= 0; mx1 <= 1; mx2 <= 2; mx3 <= 3; pm <= 4'b1100; need_fifo <= 1; nfp <= 0; swl <= 2; end
6'h2b: begin mx0 <= 0; mx1 <= 1; mx2 <= 2; mx3 <= 3; pm <= 4'b1100; need_fifo <= 1; nfp <= 0; swl <= 2; end
6'h2c: begin mx0 <= 1; mx1 <= 2; mx2 <= 3; mx3 <= 4; pm <= 4'b0100; need_fifo <= 1; nfp <= 0; swl <= 1; end
6'h2d: begin mx0 <= 1; mx1 <= 2; mx2 <= 3; mx3 <= 4; pm <= 4'b1100; need_fifo <= 1; nfp <= 1; swl <= 2; end
6'h2e: begin mx0 <= 1; mx1 <= 2; mx2 <= 3; mx3 <= 4; pm <= 4'b1100; need_fifo <= 1; nfp <= 1; swl <= 2; end
6'h2f: begin mx0 <= 1; mx1 <= 2; mx2 <= 3; mx3 <= 4; pm <= 4'b1100; need_fifo <= 1; nfp <= 1; swl <= 2; end
6'h30: begin mx0 <= 0; mx1 <= 0; mx2 <= 0; mx3 <= 0; pm <= 4'b1000; need_fifo <= 0; nfp <= 1; swl <= 1; end
6'h31: begin mx0 <= 0; mx1 <= 0; mx2 <= 0; mx3 <= 0; pm <= 4'b1000; need_fifo <= 0; nfp <= 1; swl <= 1; end
6'h32: begin mx0 <= 0; mx1 <= 0; mx2 <= 0; mx3 <= 0; pm <= 4'b1000; need_fifo <= 0; nfp <= 1; swl <= 1; end
6'h33: begin mx0 <= 0; mx1 <= 0; mx2 <= 0; mx3 <= 0; pm <= 4'b1000; need_fifo <= 0; nfp <= 1; swl <= 1; end
6'h34: begin mx0 <= 0; mx1 <= 0; mx2 <= 0; mx3 <= 1; pm <= 4'b1000; fifo_rd <= 0; nfp <= 2; swl <= 1; end
6'h35: begin mx0 <= 0; mx1 <= 0; mx2 <= 0; mx3 <= 1; pm <= 4'b1000; fifo_rd <= 0; nfp <= 2; swl <= 1; end
6'h36: begin mx0 <= 0; mx1 <= 0; mx2 <= 0; mx3 <= 1; pm <= 4'b1000; fifo_rd <= 0; nfp <= 2; swl <= 1; end
6'h37: begin mx0 <= 0; mx1 <= 0; mx2 <= 0; mx3 <= 1; pm <= 4'b1000; fifo_rd <= 0; nfp <= 2; swl <= 1; end
6'h38: begin mx0 <= 0; mx1 <= 0; mx2 <= 1; mx3 <= 2; pm <= 4'b1000; fifo_rd <= 0; nfp <= 3; swl <= 1; end
6'h39: begin mx0 <= 0; mx1 <= 0; mx2 <= 1; mx3 <= 2; pm <= 4'b1000; fifo_rd <= 0; nfp <= 3; swl <= 1; end
6'h3a: begin mx0 <= 0; mx1 <= 0; mx2 <= 1; mx3 <= 2; pm <= 4'b1000; fifo_rd <= 0; nfp <= 3; swl <= 1; end
6'h3b: begin mx0 <= 0; mx1 <= 0; mx2 <= 1; mx3 <= 2; pm <= 4'b1000; fifo_rd <= 0; nfp <= 3; swl <= 1; end
6'h3c: begin mx0 <= 0; mx1 <= 1; mx2 <= 2; mx3 <= 3; pm <= 4'b1000; fifo_rd <= 1; nfp <= 0; swl <= 1; end
6'h3d: begin mx0 <= 0; mx1 <= 1; mx2 <= 2; mx3 <= 3; pm <= 4'b1000; fifo_rd <= 1; nfp <= 0; swl <= 1; end
6'h3e: begin mx0 <= 0; mx1 <= 1; mx2 <= 2; mx3 <= 3; pm <= 4'b1000; fifo_rd <= 1; nfp <= 0; swl <= 1; end
6'h3f: begin mx0 <= 0; mx1 <= 1; mx2 <= 2; mx3 <= 3; pm <= 4'b1000; fifo_rd <= 1; nfp <= 0; swl <= 1; end
6'h34: begin mx0 <= 0; mx1 <= 0; mx2 <= 0; mx3 <= 1; pm <= 4'b1000; need_fifo <= 0; nfp <= 2; swl <= 1; end
6'h35: begin mx0 <= 0; mx1 <= 0; mx2 <= 0; mx3 <= 1; pm <= 4'b1000; need_fifo <= 0; nfp <= 2; swl <= 1; end
6'h36: begin mx0 <= 0; mx1 <= 0; mx2 <= 0; mx3 <= 1; pm <= 4'b1000; need_fifo <= 0; nfp <= 2; swl <= 1; end
6'h37: begin mx0 <= 0; mx1 <= 0; mx2 <= 0; mx3 <= 1; pm <= 4'b1000; need_fifo <= 0; nfp <= 2; swl <= 1; end
6'h38: begin mx0 <= 0; mx1 <= 0; mx2 <= 1; mx3 <= 2; pm <= 4'b1000; need_fifo <= 0; nfp <= 3; swl <= 1; end
6'h39: begin mx0 <= 0; mx1 <= 0; mx2 <= 1; mx3 <= 2; pm <= 4'b1000; need_fifo <= 0; nfp <= 3; swl <= 1; end
6'h3a: begin mx0 <= 0; mx1 <= 0; mx2 <= 1; mx3 <= 2; pm <= 4'b1000; need_fifo <= 0; nfp <= 3; swl <= 1; end
6'h3b: begin mx0 <= 0; mx1 <= 0; mx2 <= 1; mx3 <= 2; pm <= 4'b1000; need_fifo <= 0; nfp <= 3; swl <= 1; end
6'h3c: begin mx0 <= 0; mx1 <= 1; mx2 <= 2; mx3 <= 3; pm <= 4'b1000; need_fifo <= 1; nfp <= 0; swl <= 1; end
6'h3d: begin mx0 <= 0; mx1 <= 1; mx2 <= 2; mx3 <= 3; pm <= 4'b1000; need_fifo <= 1; nfp <= 0; swl <= 1; end
6'h3e: begin mx0 <= 0; mx1 <= 1; mx2 <= 2; mx3 <= 3; pm <= 4'b1000; need_fifo <= 1; nfp <= 0; swl <= 1; end
6'h3f: begin mx0 <= 0; mx1 <= 1; mx2 <= 2; mx3 <= 3; pm <= 4'b1000; need_fifo <= 1; nfp <= 0; swl <= 1; end
endcase
endmodule
......
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