diff options
| -rw-r--r-- | techlibs/efinix/arith_map.v | 50 |
1 files changed, 24 insertions, 26 deletions
diff --git a/techlibs/efinix/arith_map.v b/techlibs/efinix/arith_map.v index ae955663c..ef903171f 100644 --- a/techlibs/efinix/arith_map.v +++ b/techlibs/efinix/arith_map.v @@ -31,7 +31,7 @@ module _80_efinix_alu (A, B, CI, BI, X, Y, CO); output [Y_WIDTH-1:0] X, Y; input CI, BI; - output CO; + output [Y_WIDTH-1:0] CO; wire _TECHMAP_FAIL_ = Y_WIDTH <= 2; @@ -41,38 +41,36 @@ module _80_efinix_alu (A, B, CI, BI, X, Y, CO); wire [Y_WIDTH-1:0] AA = A_buf; wire [Y_WIDTH-1:0] BB = BI ? ~B_buf : B_buf; - wire [Y_WIDTH+1:0] COx; - wire [Y_WIDTH+2:0] C = {COx, CI}; + wire [Y_WIDTH:0] C; - EFX_ADD #(.I0_POLARITY(1'b1),.I1_POLARITY(1'b1)) - adder_cin ( - .I0(C[0]), + EFX_ADD #(.I0_POLARITY(1'b1),.I1_POLARITY(1'b1)) + adder_cin ( + .I0(CI), .I1(1'b1), .CI(1'b0), - .CO(COx[0]) + .CO(C[0]) ); genvar i; generate for (i = 0; i < Y_WIDTH; i = i + 1) begin: slice - EFX_ADD #(.I0_POLARITY(1'b1),.I1_POLARITY(1'b1)) - adder_i ( - .I0(AA[i]), - .I1(BB[i]), - .CI(C[i+1]), - .O(Y[i]), - .CO(COx[i+1]) - ); - end: slice + EFX_ADD #(.I0_POLARITY(1'b1),.I1_POLARITY(1'b1)) + adder_i ( + .I0(AA[i]), + .I1(BB[i]), + .CI(C[i]), + .O(Y[i]), + .CO(C[i+1]) + ); + EFX_ADD #(.I0_POLARITY(1'b1),.I1_POLARITY(1'b1)) + adder_cout ( + .I0(1'b0), + .I1(1'b0), + .CI(C[i+1]), + .O(CO[i]) + ); + end: slice endgenerate - EFX_ADD #(.I0_POLARITY(1'b1),.I1_POLARITY(1'b1)) - adder_cout ( - .I0(1'b0), - .I1(1'b0), - .CI(C[Y_WIDTH+1]), - .O(COx[Y_WIDTH+1]) - ); - assign CO = COx[Y_WIDTH+1]; - /* End implementation */ - assign X = AA ^ BB; + /* End implementation */ + assign X = AA ^ BB; endmodule
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