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-rw-r--r--techlibs/xilinx/cells_map.v110
-rw-r--r--techlibs/xilinx/cells_sim.v39
-rw-r--r--techlibs/xilinx/cells_xtra.sh4
-rw-r--r--techlibs/xilinx/cells_xtra.v16
-rw-r--r--techlibs/xilinx/synth_xilinx.cc8
5 files changed, 156 insertions, 21 deletions
diff --git a/techlibs/xilinx/cells_map.v b/techlibs/xilinx/cells_map.v
index d5801c0fc..1d538e262 100644
--- a/techlibs/xilinx/cells_map.v
+++ b/techlibs/xilinx/cells_map.v
@@ -17,4 +17,112 @@
*
*/
-// Empty for now
+module \$__SHREG_ (input C, input D, input [31:0] L, input E, output Q);
+ parameter DEPTH = 0;
+ parameter [DEPTH-1:0] INIT = 0;
+ parameter CLKPOL = 1;
+ parameter ENPOL = 2;
+ wire CE;
+
+ // shregmap's INIT parameter shifts out LSB first;
+ // however Xilinx expects MSB first
+ function [DEPTH-1:0] brev;
+ input [DEPTH-1:0] din;
+ integer i;
+ begin
+ for (i = 0; i < DEPTH; i=i+1)
+ brev[i] = din[DEPTH-1-i];
+ end
+ endfunction
+ localparam [DEPTH-1:0] INIT_R = brev(INIT);
+
+ parameter _TECHMAP_CONSTMSK_L_ = 0;
+ parameter _TECHMAP_CONSTVAL_L_ = 0;
+
+ generate
+ if (ENPOL == 0)
+ assign CE = ~E;
+ else if (ENPOL == 1)
+ assign CE = E;
+ else
+ assign CE = 1'b1;
+ if (DEPTH == 1) begin
+ wire _TECHMAP_FAIL_ = ~&_TECHMAP_CONSTMSK_L_ || _TECHMAP_CONSTVAL_L_ != 0;
+ if (CLKPOL)
+ FDRE #(.INIT(INIT_R)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(CE), .R(1'b0));
+ else
+ FDRE_1 #(.INIT(INIT_R)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(CE), .R(1'b0));
+ end else
+ if (DEPTH <= 16) begin
+ SRL16E #(.INIT(INIT_R), .IS_CLK_INVERTED(~CLKPOL[0])) _TECHMAP_REPLACE_ (.A0(L[0]), .A1(L[1]), .A2(L[2]), .A3(L[3]), .CE(CE), .CLK(C), .D(D), .Q(Q));
+ end else
+ if (DEPTH > 17 && DEPTH <= 32) begin
+ SRLC32E #(.INIT(INIT_R), .IS_CLK_INVERTED(~CLKPOL[0])) _TECHMAP_REPLACE_ (.A(L[4:0]), .CE(CE), .CLK(C), .D(D), .Q(Q));
+ end else
+ if (DEPTH > 33 && DEPTH <= 64) begin
+ wire T0, T1, T2;
+ SRLC32E #(.INIT(INIT_R[32-1:0]), .IS_CLK_INVERTED(~CLKPOL[0])) fpga_srl_0 (.A(L[4:0]), .CE(CE), .CLK(C), .D(D), .Q(T0), .Q31(T1));
+ \$__SHREG_ #(.DEPTH(DEPTH-32), .INIT(INIT[DEPTH-32-1:0]), .CLKPOL(CLKPOL), .ENPOL(ENPOL)) fpga_srl_1 (.C(C), .D(T1), .L(L), .E(E), .Q(T2));
+ if (&_TECHMAP_CONSTMSK_L_)
+ assign Q = T2;
+ else
+ MUXF7 fpga_mux_0 (.O(Q), .I0(T0), .I1(T2), .S(L[5]));
+ end else
+ if (DEPTH > 65 && DEPTH <= 96) begin
+ wire T0, T1, T2, T3, T4, T5, T6;
+ SRLC32E #(.INIT(INIT_R[32-1:0]), .IS_CLK_INVERTED(~CLKPOL[0])) fpga_srl_0 (.A(L[4:0]), .CE(CE), .CLK(C), .D(D), .Q(T0), .Q31(T1));
+ SRLC32E #(.INIT(INIT_R[64-1:32]), .IS_CLK_INVERTED(~CLKPOL[0])) fpga_srl_1 (.A(L[4:0]), .CE(CE), .CLK(C), .D(T1), .Q(T2), .Q31(T3));
+ \$__SHREG_ #(.DEPTH(DEPTH-64), .INIT(INIT[DEPTH-64-1:0]), .CLKPOL(CLKPOL), .ENPOL(ENPOL)) fpga_srl_2 (.C(C), .D(T3), .L(L[4:0]), .E(E), .Q(T4));
+ if (&_TECHMAP_CONSTMSK_L_)
+ assign Q = T4;
+ else begin
+ MUXF7 fpga_mux_0 (.O(T5), .I0(T0), .I1(T2), .S(L[5]));
+ MUXF7 fpga_mux_1 (.O(T6), .I0(T4), .I1(1'b0 /* unused */), .S(L[5]));
+ MUXF8 fpga_mux_2 (.O(Q), .I0(T5), .I1(T6), .S(L[6]));
+ end
+ end else
+ if (DEPTH > 97 && DEPTH <= 128) begin
+ wire T0, T1, T2, T3, T4, T5, T6, T7, T8;
+ SRLC32E #(.INIT(INIT_R[32-1:0]), .IS_CLK_INVERTED(~CLKPOL[0])) fpga_srl_0 (.A(L[4:0]), .CE(CE), .CLK(C), .D(D), .Q(T0), .Q31(T1));
+ SRLC32E #(.INIT(INIT_R[64-1:32]), .IS_CLK_INVERTED(~CLKPOL[0])) fpga_srl_1 (.A(L[4:0]), .CE(CE), .CLK(C), .D(T1), .Q(T2), .Q31(T3));
+ SRLC32E #(.INIT(INIT_R[96-1:64]), .IS_CLK_INVERTED(~CLKPOL[0])) fpga_srl_2 (.A(L[4:0]), .CE(CE), .CLK(C), .D(T3), .Q(T4), .Q31(T5));
+ \$__SHREG_ #(.DEPTH(DEPTH-96), .INIT(INIT[DEPTH-96-1:0]), .CLKPOL(CLKPOL), .ENPOL(ENPOL)) fpga_srl_3 (.C(C), .D(T5), .L(L[4:0]), .E(E), .Q(T6));
+ if (&_TECHMAP_CONSTMSK_L_)
+ assign Q = T6;
+ else begin
+ MUXF7 fpga_mux_0 (.O(T7), .I0(T0), .I1(T2), .S(L[5]));
+ MUXF7 fpga_mux_1 (.O(T8), .I0(T4), .I1(T6), .S(L[5]));
+ MUXF8 fpga_mux_2 (.O(Q), .I0(T7), .I1(T8), .S(L[6]));
+ end
+ end
+ else if (DEPTH <= 128 || (DEPTH == 129 && &_TECHMAP_CONSTMSK_L_)) begin
+ // Handle cases where depth is just 1 over a convenient value,
+ if (&_TECHMAP_CONSTMSK_L_) begin
+ // For constant length, use the flop
+ wire T0;
+ \$__SHREG_ #(.DEPTH(DEPTH-1), .INIT(INIT[DEPTH-1:1]), .CLKPOL(CLKPOL), .ENPOL(ENPOL)) fpga_srl_0 (.C(C), .D(D), .L(DEPTH-1-1), .E(E), .Q(T0));
+ \$__SHREG_ #(.DEPTH(1), .INIT(INIT[0]), .CLKPOL(CLKPOL), .ENPOL(ENPOL)) fpga_srl_1 (.C(C), .D(T0), .L(0), .E(E), .Q(Q));
+ end
+ else begin
+ // For variable length, bump up to the next length
+ // because we can't access Q31
+ \$__SHREG_ #(.DEPTH(DEPTH+1), .INIT(INIT), .CLKPOL(CLKPOL), .ENPOL(ENPOL)) _TECHMAP_REPLACE_ (.C(C), .D(D), .L(L), .E(E), .Q(Q));
+ end
+ end
+ else begin
+ if (&_TECHMAP_CONSTMSK_L_) begin
+ // UG474 (v1.8, p34) states that:
+ // "There are no direct connections between slices to form longer shift
+ // registers, nor is the MC31 output at LUT B/C/D available."
+ wire T0;
+ \$__SHREG_ #(.DEPTH(128), .INIT(INIT[DEPTH-1:DEPTH-128]), .CLKPOL(CLKPOL), .ENPOL(ENPOL)) fpga_srl_0 (.C(C), .D(D), .L(127), .E(E), .Q(T0));
+ \$__SHREG_ #(.DEPTH(DEPTH-128), .INIT(INIT[DEPTH-128-1:0]), .CLKPOL(CLKPOL), .ENPOL(ENPOL)) fpga_srl_1 (.C(C), .D(T0), .L(DEPTH-1-128), .E(E), .Q(Q));
+ end
+ else begin
+ // No way to create variable length shift registers >128 bits as Q31
+ // cannot be output to the fabric...
+ wire _TECHMAP_FAIL_ = 1;
+ end
+ end
+ endgenerate
+endmodule
diff --git a/techlibs/xilinx/cells_sim.v b/techlibs/xilinx/cells_sim.v
index ff5ff0726..c756115f6 100644
--- a/techlibs/xilinx/cells_sim.v
+++ b/techlibs/xilinx/cells_sim.v
@@ -251,3 +251,42 @@ module RAM128X1D (
wire clk = WCLK ^ IS_WCLK_INVERTED;
always @(posedge clk) if (WE) mem[A] <= D;
endmodule
+
+module SRL16E (
+ output Q,
+ input A0, A1, A2, A3, CE, CLK, D
+);
+ parameter [15:0] INIT = 16'h0000;
+ parameter [0:0] IS_CLK_INVERTED = 1'b0;
+
+ reg [15:0] r = INIT;
+ assign Q = r[{A3,A2,A1,A0}];
+ generate
+ if (IS_CLK_INVERTED) begin
+ always @(negedge CLK) if (CE) r <= { r[14:0], D };
+ end
+ else
+ always @(posedge CLK) if (CE) r <= { r[14:0], D };
+ endgenerate
+endmodule
+
+module SRLC32E (
+ output Q,
+ output Q31,
+ input [4:0] A,
+ input CE, CLK, D
+);
+ parameter [31:0] INIT = 32'h00000000;
+ parameter [0:0] IS_CLK_INVERTED = 1'b0;
+
+ reg [31:0] r = INIT;
+ assign Q31 = r[31];
+ assign Q = r[A];
+ generate
+ if (IS_CLK_INVERTED) begin
+ always @(negedge CLK) if (CE) r <= { r[30:0], D };
+ end
+ else
+ always @(posedge CLK) if (CE) r <= { r[30:0], D };
+ endgenerate
+endmodule
diff --git a/techlibs/xilinx/cells_xtra.sh b/techlibs/xilinx/cells_xtra.sh
index 37c3e5480..46ababdea 100644
--- a/techlibs/xilinx/cells_xtra.sh
+++ b/techlibs/xilinx/cells_xtra.sh
@@ -134,8 +134,8 @@ function xtract_cell_decl()
xtract_cell_decl ROM256X1
xtract_cell_decl ROM32X1
xtract_cell_decl ROM64X1
- xtract_cell_decl SRL16E
- xtract_cell_decl SRLC32E
+ #xtract_cell_decl SRL16E
+ #xtract_cell_decl SRLC32E
xtract_cell_decl STARTUPE2
xtract_cell_decl USR_ACCESSE2
xtract_cell_decl XADC
diff --git a/techlibs/xilinx/cells_xtra.v b/techlibs/xilinx/cells_xtra.v
index 995d62e18..6adad35ae 100644
--- a/techlibs/xilinx/cells_xtra.v
+++ b/techlibs/xilinx/cells_xtra.v
@@ -3843,22 +3843,6 @@ module ROM64X1 (...);
input A0, A1, A2, A3, A4, A5;
endmodule
-module SRL16E (...);
- parameter [15:0] INIT = 16'h0000;
- parameter [0:0] IS_CLK_INVERTED = 1'b0;
- output Q;
- input A0, A1, A2, A3, CE, CLK, D;
-endmodule
-
-module SRLC32E (...);
- parameter [31:0] INIT = 32'h00000000;
- parameter [0:0] IS_CLK_INVERTED = 1'b0;
- output Q;
- output Q31;
- input [4:0] A;
- input CE, CLK, D;
-endmodule
-
module STARTUPE2 (...);
parameter PROG_USR = "FALSE";
parameter real SIM_CCLK_FREQ = 0.0;
diff --git a/techlibs/xilinx/synth_xilinx.cc b/techlibs/xilinx/synth_xilinx.cc
index 805ae8e6e..61895e032 100644
--- a/techlibs/xilinx/synth_xilinx.cc
+++ b/techlibs/xilinx/synth_xilinx.cc
@@ -110,7 +110,9 @@ struct SynthXilinxPass : public Pass
log(" dffsr2dff\n");
log(" dff2dffe\n");
log(" opt -full\n");
- log(" techmap -map +/techmap.v -map +/xilinx/arith_map.v -map +/xilinx/ff_map.v\n");
+ log(" simplemap t:$dff*\n");
+ log(" shregmap -tech xilinx\n");
+ log(" techmap -map +/techmap.v -map +/xilinx/arith_map.v +/xilinx/ff_map.v\n");
log(" opt -fast\n");
log("\n");
log(" map_luts:\n");
@@ -255,13 +257,15 @@ struct SynthXilinxPass : public Pass
Pass::call(design, "dff2dffe");
Pass::call(design, "opt -full");
+ Pass::call(design, "simplemap t:$dff*");
+ Pass::call(design, "shregmap -tech xilinx");
+
if (vpr) {
Pass::call(design, "techmap -map +/techmap.v -map +/xilinx/arith_map.v -map +/xilinx/ff_map.v -D _EXPLICIT_CARRY");
} else {
Pass::call(design, "techmap -map +/techmap.v -map +/xilinx/arith_map.v -map +/xilinx/ff_map.v");
}
- Pass::call(design, "hierarchy -check");
Pass::call(design, "opt -fast");
}
generated by cgit v1.2.3 (git 2.25.1) at 2025-04-06 16:03:03 +0000