diff options
Diffstat (limited to 'techlibs/xilinx/cells_map.v')
| -rw-r--r-- | techlibs/xilinx/cells_map.v | 36 |
1 files changed, 17 insertions, 19 deletions
diff --git a/techlibs/xilinx/cells_map.v b/techlibs/xilinx/cells_map.v index 92358620e..0ace369d1 100644 --- a/techlibs/xilinx/cells_map.v +++ b/techlibs/xilinx/cells_map.v @@ -125,31 +125,29 @@ module \$__SHREG_ (input C, input D, input E, output Q); 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])); end else - if (DEPTH <= 128) begin - if (DEPTH > 97) 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)); - 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])); - end - // Handle case where depth is just 1 over a convenient value, + 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)); + 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])); + end + else if (DEPTH <= 129) begin + // Handle cases where depth is just 1 over a convenient value, // in which case use the flop - else begin - 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)); - end + 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)); 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, T1; + 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)); end |