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author | Eddie Hung <eddieh@ece.ubc.ca> | 2019-03-14 09:38:42 -0700 |
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committer | Eddie Hung <eddieh@ece.ubc.ca> | 2019-03-14 09:38:42 -0700 |
commit | e7ef7fa443c0b7c7ec9e4bbb15893053aed8c3ce (patch) | |
tree | 95ba99bf3ce2cab5951e5bebf211249252fbf859 | |
parent | af5706c2a38c010e6c7343aeb1c5d6e26a6b7799 (diff) | |
download | yosys-e7ef7fa443c0b7c7ec9e4bbb15893053aed8c3ce.tar.gz yosys-e7ef7fa443c0b7c7ec9e4bbb15893053aed8c3ce.tar.bz2 yosys-e7ef7fa443c0b7c7ec9e4bbb15893053aed8c3ce.zip |
Reverse bits in INIT parameter for Xilinx, since MSB is shifted first
-rw-r--r-- | techlibs/xilinx/cells_map.v | 48 |
1 files changed, 32 insertions, 16 deletions
diff --git a/techlibs/xilinx/cells_map.v b/techlibs/xilinx/cells_map.v index 0c5c5a26f..69f8b85f4 100644 --- a/techlibs/xilinx/cells_map.v +++ b/techlibs/xilinx/cells_map.v @@ -23,6 +23,19 @@ module \$__SHREG_ (input C, input D, input E, output Q); 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); + generate if (ENPOL == 0) assign CE = ~E; @@ -31,28 +44,31 @@ module \$__SHREG_ (input C, input D, input E, output Q); else assign CE = 1'b1; if (DEPTH == 1) begin - FDRE #(.INIT(INIT), .IS_C_INVERTED(~CLKPOL[0]), .IS_D_INVERTED(|0), .IS_R_INVERTED(|0)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(CE), .R(1'b0)); + 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 localparam [3:0] A = DEPTH - 1; - SRL16E #(.INIT(INIT), .IS_CLK_INVERTED(~CLKPOL[0])) _TECHMAP_REPLACE_ (.A0(A[0]), .A1(A[1]), .A2(A[2]), .A3(A[3]), .CE(CE), .CLK(C), .D(D), .Q(Q)); + SRL16E #(.INIT(INIT_R), .IS_CLK_INVERTED(~CLKPOL[0])) _TECHMAP_REPLACE_ (.A0(A[0]), .A1(A[1]), .A2(A[2]), .A3(A[3]), .CE(CE), .CLK(C), .D(D), .Q(Q)); end else if (DEPTH > 17 && DEPTH <= 32) begin - SRLC32E #(.INIT(INIT), .IS_CLK_INVERTED(~CLKPOL[0])) _TECHMAP_REPLACE_ (.A(DEPTH-1), .CE(CE), .CLK(C), .D(D), .Q(Q)); + SRLC32E #(.INIT(INIT_R), .IS_CLK_INVERTED(~CLKPOL[0])) _TECHMAP_REPLACE_ (.A(DEPTH-1), .CE(CE), .CLK(C), .D(D), .Q(Q)); end else if (DEPTH > 33 && DEPTH <= 64) begin wire T0, T1, T2; localparam [5:0] A = DEPTH-1; - SRLC32E #(.INIT(INIT[32-1:0]), .IS_CLK_INVERTED(~CLKPOL[0])) fpga_srl_0 (.A(A[4:0]), .CE(CE), .CLK(C), .D(D), .Q(T0), .Q31(T1)); - \$__SHREG_ #(.DEPTH(DEPTH-32), .INIT(INIT[DEPTH-1:32]), .CLKPOL(CLKPOL), .ENPOL(ENPOL)) fpga_srl_1 (.C(C), .D(T1), .E(E), .Q(T2)); + SRLC32E #(.INIT(INIT_R[32-1:0]), .IS_CLK_INVERTED(~CLKPOL[0])) fpga_srl_0 (.A(A[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), .E(E), .Q(T2)); MUXF7 fpga_mux_0 (.O(Q), .I0(T0), .I1(T2), .S(A[5])); end else if (DEPTH > 65 && DEPTH <= 96) begin localparam [6:0] A = DEPTH-1; wire T0, T1, T2, T3, T4, T5, T6; - SRLC32E #(.INIT(INIT[32-1:0]), .IS_CLK_INVERTED(~CLKPOL[0])) fpga_srl_0 (.A(A[4:0]), .CE(CE), .CLK(C), .D(D), .Q(T0), .Q31(T1)); - SRLC32E #(.INIT(INIT[64-1:32]), .IS_CLK_INVERTED(~CLKPOL[0])) fpga_srl_1 (.A(A[4:0]), .CE(CE), .CLK(C), .D(T1), .Q(T2), .Q31(T3)); - \$__SHREG_ #(.DEPTH(DEPTH-64), .INIT(INIT[DEPTH-1:64]), .CLKPOL(CLKPOL), .ENPOL(ENPOL)) fpga_srl_2 (.C(C), .D(T3), .E(E), .Q(T4)); + SRLC32E #(.INIT(INIT_R[32-1:0]), .IS_CLK_INVERTED(~CLKPOL[0])) fpga_srl_0 (.A(A[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(A[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), .E(E), .Q(T4)); MUXF7 fpga_mux_0 (.O(T5), .I0(T0), .I1(T2), .S(A[5])); MUXF7 fpga_mux_1 (.O(T6), .I0(T4), .I1(1'b0 /* unused */), .S(A[5])); MUXF8 fpga_mux_2 (.O(Q), .I0(T5), .I1(T6), .S(A[6])); @@ -60,10 +76,10 @@ module \$__SHREG_ (input C, input D, input E, output Q); if (DEPTH > 97 && DEPTH <= 128) begin localparam [6:0] A = DEPTH-1; wire T0, T1, T2, T3, T4, T5, T6, T7, T8; - SRLC32E #(.INIT(INIT[32-1:0]), .IS_CLK_INVERTED(~CLKPOL[0])) fpga_srl_0 (.A(A[4:0]), .CE(CE), .CLK(C), .D(D), .Q(T0), .Q31(T1)); - SRLC32E #(.INIT(INIT[64-1:32]), .IS_CLK_INVERTED(~CLKPOL[0])) fpga_srl_1 (.A(A[4:0]), .CE(CE), .CLK(C), .D(T1), .Q(T2), .Q31(T3)); - SRLC32E #(.INIT(INIT[96-1:64]), .IS_CLK_INVERTED(~CLKPOL[0])) fpga_srl_2 (.A(A[4:0]), .CE(CE), .CLK(C), .D(T3), .Q(T4), .Q31(T5)); - \$__SHREG_ #(.DEPTH(DEPTH-96), .INIT(INIT[DEPTH-1:96]), .CLKPOL(CLKPOL), .ENPOL(ENPOL)) fpga_srl_3 (.C(C), .D(T5), .E(E), .Q(T6)); + SRLC32E #(.INIT(INIT_R[32-1:0]), .IS_CLK_INVERTED(~CLKPOL[0])) fpga_srl_0 (.A(A[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(A[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(A[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), .E(E), .Q(T6)); MUXF7 fpga_mux_0 (.O(T7), .I0(T0), .I1(T2), .S(A[5])); MUXF7 fpga_mux_1 (.O(T8), .I0(T4), .I1(T6), .S(A[5])); MUXF8 fpga_mux_2 (.O(Q), .I0(T7), .I1(T8), .S(A[6])); @@ -72,16 +88,16 @@ module \$__SHREG_ (input C, input D, input E, output Q); // Handle cases where depth is just 1 over a convenient value, // in which case use the flop wire T0; - \$__SHREG_ #(.DEPTH(DEPTH-1), .INIT(INIT[DEPTH-2:0]), .CLKPOL(CLKPOL), .ENPOL(ENPOL)) fpga_srl_0 (.C(C), .D(D), .E(E), .Q(T0)); - \$__SHREG_ #(.DEPTH(1), .INIT(INIT[DEPTH-1]), .CLKPOL(CLKPOL), .ENPOL(ENPOL)) fpga_srl_1 (.C(C), .D(T0), .E(E), .Q(Q)); + \$__SHREG_ #(.DEPTH(DEPTH-1), .INIT(INIT[DEPTH-1:1]), .CLKPOL(CLKPOL), .ENPOL(ENPOL)) fpga_srl_0 (.C(C), .D(D), .E(E), .Q(T0)); + \$__SHREG_ #(.DEPTH(1), .INIT(INIT[0]), .CLKPOL(CLKPOL), .ENPOL(ENPOL)) fpga_srl_1 (.C(C), .D(T0), .E(E), .Q(Q)); end else 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[128-1:0]), .CLKPOL(CLKPOL), .ENPOL(ENPOL)) fpga_srl_0 (.C(C), .D(D), .E(E), .Q(T0)); - \$__SHREG_ #(.DEPTH(DEPTH-128), .INIT(INIT[DEPTH-1:128]), .CLKPOL(CLKPOL), .ENPOL(ENPOL)) fpga_srl_1 (.C(C), .D(T0), .E(E), .Q(Q)); + \$__SHREG_ #(.DEPTH(128), .INIT(INIT[DEPTH-1:DEPTH-128]), .CLKPOL(CLKPOL), .ENPOL(ENPOL)) fpga_srl_0 (.C(C), .D(D), .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), .E(E), .Q(Q)); end endgenerate endmodule |