From e0b46eb4cbadafa5f03a5337f761d0ede2b993fa Mon Sep 17 00:00:00 2001 From: Eddie Hung Date: Wed, 10 Apr 2019 08:49:55 -0700 Subject: [PATCH] WIP for $shiftx to wide mux --- techlibs/xilinx/cells_map.v | 64 ++++++++++++++++++++++++++++++++++++- 1 file changed, 63 insertions(+), 1 deletion(-) diff --git a/techlibs/xilinx/cells_map.v b/techlibs/xilinx/cells_map.v index d5801c0fc..4f5c7ff18 100644 --- a/techlibs/xilinx/cells_map.v +++ b/techlibs/xilinx/cells_map.v @@ -17,4 +17,66 @@ * */ -// Empty for now +module \$shiftx (A, B, Y); + parameter A_SIGNED = 0; + parameter B_SIGNED = 0; + parameter A_WIDTH = 1; + parameter B_WIDTH = 1; + parameter Y_WIDTH = 1; + + input [A_WIDTH-1:0] A; + input [B_WIDTH-1:0] B; + output [Y_WIDTH-1:0] Y; + + generate + genvar i; + if (B_WIDTH < 3) begin + reg _TECHMAP_FAIL_; + assign _TECHMAP_FAIL_ = 1; + end + else if (B_WIDTH == 3) begin + localparam a_width0 = Y_WIDTH * (2 ** (B_WIDTH-1)); + localparam a_widthN = A_WIDTH - a_width0; + wire [Y_WIDTH-1:0] T0, T1; + \$shiftx #(.A_SIGNED(A_SIGNED), .B_SIGNED(B_SIGNED), .A_WIDTH(a_width0), .B_WIDTH(B_WIDTH-1), .Y_WIDTH(Y_WIDTH)) fpga_shiftx (.A(A[a_width0-1:0]), .B(B[B_WIDTH-2:0]), .Y(T0)); + \$shiftx #(.A_SIGNED(A_SIGNED), .B_SIGNED(B_SIGNED), .A_WIDTH(a_widthN), .B_WIDTH($clog2(a_widthN)), .Y_WIDTH(Y_WIDTH)) fpga_shiftx_last (.A(A[A_WIDTH-1:a_width0]), .B(B[$clog2(a_widthN)-1:0]), .Y(T1)); + //MUXF7 fpga_mux[Y_WIDTH-1:0] (.I0(T0), .I1(T1), .S(B[B_WIDTH-1]), .O(Y)); + for (i = 0; i < Y_WIDTH; i++) + MUXF7 fpga_mux (.I0(T0[i]), .I1(T1[i]), .S(B[B_WIDTH-1]), .O(Y[i])); + end + else if (B_WIDTH == 4) begin + localparam a_width0 = Y_WIDTH * (2 ** (B_WIDTH-2)); + localparam num_mux8 = A_WIDTH / a_width0; + localparam a_widthN = A_WIDTH - num_mux8*a_width0; + wire [Y_WIDTH*B_WIDTH-1:0] T; + wire [Y_WIDTH-1:0] T0, T1; + for (i = 0; i < B_WIDTH; i++) + if (i < num_mux8) + \$shiftx #(.A_SIGNED(A_SIGNED), .B_SIGNED(B_SIGNED), .A_WIDTH(a_width0), .B_WIDTH(B_WIDTH-2), .Y_WIDTH(Y_WIDTH)) fpga_shiftx (.A(A[(i+1)*a_width0-1:i*a_width0]), .B(B[B_WIDTH-3:0]), .Y(T[(i+1)*Y_WIDTH-1:i*Y_WIDTH])); + else if (i == num_mux8 && A_WIDTH > i*a_width0) + \$shiftx #(.A_SIGNED(A_SIGNED), .B_SIGNED(B_SIGNED), .A_WIDTH(a_widthN), .B_WIDTH($clog2(a_widthN)), .Y_WIDTH(Y_WIDTH)) fpga_shiftx_last (.A(A[A_WIDTH-1:i*a_width0]), .B(B[$clog2(a_widthN)-1:0]), .Y(T[(i+1)*Y_WIDTH-1:i*Y_WIDTH])); + else + assign T[(i+1)*Y_WIDTH-1:i*Y_WIDTH] = {Y_WIDTH{1'bx}}; + for (i = 0; i < Y_WIDTH; i++) begin + MUXF7 fpga_mux_0 (.I0(T[i*B_WIDTH+0]), .I1(T[i*B_WIDTH+1]), .S(B[B_WIDTH-2]), .O(T0[i])); + MUXF7 fpga_mux_1 (.I0(T[i*B_WIDTH+2]), .I1(T[i*B_WIDTH+3]), .S(B[B_WIDTH-2]), .O(T1[i])); + MUXF8 fpga_mux_2 (.I0(T0[i]), .I1(T1[i]), .S(B[B_WIDTH-1]), .O(Y[i])); + end + end + else begin + localparam a_width0 = Y_WIDTH * (2 ** 4); + localparam num_mux16 = A_WIDTH / a_width0; + localparam a_widthN = A_WIDTH - num_mux16*a_width0; + wire [Y_WIDTH*(2**(B_WIDTH-4))-1:0] T; + for (i = 0; i < 2 ** (B_WIDTH-4); i++) + if (i < num_mux16) + \$shiftx #(.A_SIGNED(A_SIGNED), .B_SIGNED(B_SIGNED), .A_WIDTH(a_width0), .B_WIDTH(4), .Y_WIDTH(Y_WIDTH)) fpga_shiftx (.A(A[(i+1)*a_width0-1:i*a_width0]), .B(B[4-1:0]), .Y(T[(i+1)*Y_WIDTH-1:i*Y_WIDTH])); + else if (i == num_mux16 && a_widthN > 0) begin + \$shiftx #(.A_SIGNED(A_SIGNED), .B_SIGNED(B_SIGNED), .A_WIDTH(a_widthN), .B_WIDTH($clog2(a_widthN)), .Y_WIDTH(Y_WIDTH)) fpga_shiftx_last (.A(A[A_WIDTH-1:i*a_width0]), .B(B[$clog2(a_widthN)-1:0]), .Y(T[(i+1)*Y_WIDTH-1:i*Y_WIDTH])); + end + else + assign T[(i+1)*Y_WIDTH-1:i*Y_WIDTH] = {Y_WIDTH{1'bx}}; + \$shiftx #(.A_SIGNED(A_SIGNED), .B_SIGNED(B_SIGNED), .A_WIDTH(Y_WIDTH*(2**(B_WIDTH-4))), .B_WIDTH(B_WIDTH-4), .Y_WIDTH(Y_WIDTH)) fpga_shiftx (.A(T), .B(B[B_WIDTH-1:4]), .Y(Y)); + end + endgenerate +endmodule -- 2.30.2