parameter WIDTH = 0;
parameter LUT = 0;
+
+ // Need to swap input ordering, and fix init accordingly,
+ // to match ABC's expectation of LUT inputs in non-decreasing
+ // delay order
+ localparam P_WIDTH = WIDTH < 4 ? 4 : WIDTH;
+ function [P_WIDTH-1:0] permute_index;
+ input [P_WIDTH-1:0] i;
+ integer j;
+ begin
+ permute_index = 0;
+ for (j = 0; j < P_WIDTH; j = j + 1)
+ permute_index[P_WIDTH-1 - j] = i[j];
+ end
+ endfunction
+
+ function [2**P_WIDTH-1:0] permute_init;
+ input [2**P_WIDTH-1:0] orig;
+ integer i;
+ begin
+ permute_init = 0;
+ for (i = 0; i < 2**P_WIDTH; i = i + 1)
+ permute_init[i] = orig[permute_index(i)];
+ end
+ endfunction
+
+ parameter [2**P_WIDTH-1:0] P_LUT = permute_init(LUT);
+
input [WIDTH-1:0] A;
output Y;
generate
if (WIDTH == 1) begin
- LUT4 #(.INIT(LUT)) _TECHMAP_REPLACE_ (.Z(Y),
- .A(A[0]), .B(1'b0), .C(1'b0), .D(1'b0));
+ LUT4 #(.INIT(P_LUT)) _TECHMAP_REPLACE_ (.Z(Y),
+ .A(1'b0), .B(1'b0), .C(1'b0), .D(A[0]));
end else
if (WIDTH == 2) begin
- LUT4 #(.INIT(LUT)) _TECHMAP_REPLACE_ (.Z(Y),
- .A(A[0]), .B(A[1]), .C(1'b0), .D(1'b0));
+ LUT4 #(.INIT(P_LUT)) _TECHMAP_REPLACE_ (.Z(Y),
+ .A(1'b0), .B(1'b0), .C(A[1]), .D(A[0]));
end else
if (WIDTH == 3) begin
- LUT4 #(.INIT(LUT)) _TECHMAP_REPLACE_ (.Z(Y),
- .A(A[0]), .B(A[1]), .C(A[2]), .D(1'b0));
+ LUT4 #(.INIT(P_LUT)) _TECHMAP_REPLACE_ (.Z(Y),
+ .A(1'b0), .B(A[2]), .C(A[1]), .D(A[0]));
end else
if (WIDTH == 4) begin
- LUT4 #(.INIT(LUT)) _TECHMAP_REPLACE_ (.Z(Y),
- .A(A[0]), .B(A[1]), .C(A[2]), .D(A[3]));
+ LUT4 #(.INIT(P_LUT)) _TECHMAP_REPLACE_ (.Z(Y),
+ .A(A[3]), .B(A[2]), .C(A[1]), .D(A[0]));
`ifndef NO_PFUMUX
end else
if (WIDTH == 5) begin
wire f0, f1;
- LUT4 #(.INIT(LUT[15: 0])) lut0 (.Z(f0),
- .A(A[0]), .B(A[1]), .C(A[2]), .D(A[3]));
- LUT4 #(.INIT(LUT[31:16])) lut1 (.Z(f1),
- .A(A[0]), .B(A[1]), .C(A[2]), .D(A[3]));
- PFUMX mux5(.ALUT(f1), .BLUT(f0), .C0(A[4]), .Z(Y));
+ LUT4 #(.INIT(P_LUT[15: 0])) lut0 (.Z(f0),
+ .A(A[4]), .B(A[3]), .C(A[2]), .D(A[1]));
+ LUT4 #(.INIT(P_LUT[31:16])) lut1 (.Z(f1),
+ .A(A[4]), .B(A[3]), .C(A[2]), .D(A[1]));
+ PFUMX mux5(.ALUT(f1), .BLUT(f0), .C0(A[0]), .Z(Y));
end else
if (WIDTH == 6) begin
wire f0, f1, f2, f3, g0, g1;
- LUT4 #(.INIT(LUT[15: 0])) lut0 (.Z(f0),
- .A(A[0]), .B(A[1]), .C(A[2]), .D(A[3]));
- LUT4 #(.INIT(LUT[31:16])) lut1 (.Z(f1),
- .A(A[0]), .B(A[1]), .C(A[2]), .D(A[3]));
-
- LUT4 #(.INIT(LUT[47:32])) lut2 (.Z(f2),
- .A(A[0]), .B(A[1]), .C(A[2]), .D(A[3]));
- LUT4 #(.INIT(LUT[63:48])) lut3 (.Z(f3),
- .A(A[0]), .B(A[1]), .C(A[2]), .D(A[3]));
-
- PFUMX mux50(.ALUT(f1), .BLUT(f0), .C0(A[4]), .Z(g0));
- PFUMX mux51(.ALUT(f3), .BLUT(f2), .C0(A[4]), .Z(g1));
- L6MUX21 mux6 (.D0(g0), .D1(g1), .SD(A[5]), .Z(Y));
+ LUT4 #(.INIT(P_LUT[15: 0])) lut0 (.Z(f0),
+ .A(A[5]), .B(A[4]), .C(A[3]), .D(A[2]));
+ LUT4 #(.INIT(P_LUT[31:16])) lut1 (.Z(f1),
+ .A(A[5]), .B(A[4]), .C(A[3]), .D(A[2]));
+
+ LUT4 #(.INIT(P_LUT[47:32])) lut2 (.Z(f2),
+ .A(A[5]), .B(A[4]), .C(A[3]), .D(A[2]));
+ LUT4 #(.INIT(P_LUT[63:48])) lut3 (.Z(f3),
+ .A(A[5]), .B(A[4]), .C(A[3]), .D(A[2]));
+
+ PFUMX mux50(.ALUT(f1), .BLUT(f0), .C0(A[1]), .Z(g0));
+ PFUMX mux51(.ALUT(f3), .BLUT(f2), .C0(A[1]), .Z(g1));
+ L6MUX21 mux6 (.D0(g0), .D1(g1), .SD(A[0]), .Z(Y));
end else
if (WIDTH == 7) begin
wire f0, f1, f2, f3, f4, f5, f6, f7, g0, g1, g2, g3, h0, h1;
- LUT4 #(.INIT(LUT[15: 0])) lut0 (.Z(f0),
- .A(A[0]), .B(A[1]), .C(A[2]), .D(A[3]));
- LUT4 #(.INIT(LUT[31:16])) lut1 (.Z(f1),
- .A(A[0]), .B(A[1]), .C(A[2]), .D(A[3]));
-
- LUT4 #(.INIT(LUT[47:32])) lut2 (.Z(f2),
- .A(A[0]), .B(A[1]), .C(A[2]), .D(A[3]));
- LUT4 #(.INIT(LUT[63:48])) lut3 (.Z(f3),
- .A(A[0]), .B(A[1]), .C(A[2]), .D(A[3]));
-
- LUT4 #(.INIT(LUT[79:64])) lut4 (.Z(f4),
- .A(A[0]), .B(A[1]), .C(A[2]), .D(A[3]));
- LUT4 #(.INIT(LUT[95:80])) lut5 (.Z(f5),
- .A(A[0]), .B(A[1]), .C(A[2]), .D(A[3]));
-
- LUT4 #(.INIT(LUT[111: 96])) lut6 (.Z(f6),
- .A(A[0]), .B(A[1]), .C(A[2]), .D(A[3]));
- LUT4 #(.INIT(LUT[127:112])) lut7 (.Z(f7),
- .A(A[0]), .B(A[1]), .C(A[2]), .D(A[3]));
-
- PFUMX mux50(.ALUT(f1), .BLUT(f0), .C0(A[4]), .Z(g0));
- PFUMX mux51(.ALUT(f3), .BLUT(f2), .C0(A[4]), .Z(g1));
- PFUMX mux52(.ALUT(f5), .BLUT(f4), .C0(A[4]), .Z(g2));
- PFUMX mux53(.ALUT(f7), .BLUT(f6), .C0(A[4]), .Z(g3));
- L6MUX21 mux60 (.D0(g0), .D1(g1), .SD(A[5]), .Z(h0));
- L6MUX21 mux61 (.D0(g2), .D1(g3), .SD(A[5]), .Z(h1));
- L6MUX21 mux7 (.D0(h0), .D1(h1), .SD(A[6]), .Z(Y));
+ LUT4 #(.INIT(P_LUT[15: 0])) lut0 (.Z(f0),
+ .A(A[6]), .B(A[5]), .C(A[4]), .D(A[3]));
+ LUT4 #(.INIT(P_LUT[31:16])) lut1 (.Z(f1),
+ .A(A[6]), .B(A[5]), .C(A[4]), .D(A[3]));
+
+ LUT4 #(.INIT(P_LUT[47:32])) lut2 (.Z(f2),
+ .A(A[6]), .B(A[5]), .C(A[4]), .D(A[3]));
+ LUT4 #(.INIT(P_LUT[63:48])) lut3 (.Z(f3),
+ .A(A[6]), .B(A[5]), .C(A[4]), .D(A[3]));
+
+ LUT4 #(.INIT(P_LUT[79:64])) lut4 (.Z(f4),
+ .A(A[6]), .B(A[5]), .C(A[4]), .D(A[3]));
+ LUT4 #(.INIT(P_LUT[95:80])) lut5 (.Z(f5),
+ .A(A[6]), .B(A[5]), .C(A[4]), .D(A[3]));
+
+ LUT4 #(.INIT(P_LUT[111: 96])) lut6 (.Z(f6),
+ .A(A[6]), .B(A[5]), .C(A[4]), .D(A[3]));
+ LUT4 #(.INIT(P_LUT[127:112])) lut7 (.Z(f7),
+ .A(A[6]), .B(A[5]), .C(A[4]), .D(A[3]));
+
+ PFUMX mux50(.ALUT(f1), .BLUT(f0), .C0(A[2]), .Z(g0));
+ PFUMX mux51(.ALUT(f3), .BLUT(f2), .C0(A[2]), .Z(g1));
+ PFUMX mux52(.ALUT(f5), .BLUT(f4), .C0(A[2]), .Z(g2));
+ PFUMX mux53(.ALUT(f7), .BLUT(f6), .C0(A[2]), .Z(g3));
+ L6MUX21 mux60 (.D0(g0), .D1(g1), .SD(A[1]), .Z(h0));
+ L6MUX21 mux61 (.D0(g2), .D1(g3), .SD(A[1]), .Z(h1));
+ L6MUX21 mux7 (.D0(h0), .D1(h1), .SD(A[0]), .Z(Y));
`endif
end else begin
wire _TECHMAP_FAIL_ = 1;
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