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| author | Clifford Wolf <clifford@clifford.at> | 2014-08-14 11:39:46 +0200 |
|---|---|---|
| committer | Clifford Wolf <clifford@clifford.at> | 2014-08-14 11:39:46 +0200 |
| commit | 13f2f36884fa3e4a8329dab2556af7000cb085df (patch) | |
| tree | 59787125c75220ee6f78d160e6cc6cfcc583d0ec /techlibs/common/simlib.v | |
| parent | 28cf48e31f049f8343023de46cd916ac47fcfc5d (diff) | |
| download | yosys-13f2f36884fa3e4a8329dab2556af7000cb085df.tar.gz yosys-13f2f36884fa3e4a8329dab2556af7000cb085df.tar.bz2 yosys-13f2f36884fa3e4a8329dab2556af7000cb085df.zip | |
RIP $safe_pmux
Diffstat (limited to 'techlibs/common/simlib.v')
| -rw-r--r-- | techlibs/common/simlib.v | 31 |
1 files changed, 4 insertions, 27 deletions
diff --git a/techlibs/common/simlib.v b/techlibs/common/simlib.v index c2f6cb278..4b3317a76 100644 --- a/techlibs/common/simlib.v +++ b/techlibs/common/simlib.v @@ -938,39 +938,16 @@ input [S_WIDTH-1:0] S; output reg [WIDTH-1:0] Y; integer i; +reg found_active_sel_bit; always @* begin Y = A; - for (i = 0; i < S_WIDTH; i = i+1) - if (S[i]) - Y = B >> (WIDTH*i); -end - -endmodule - -// -------------------------------------------------------- - -module \$safe_pmux (A, B, S, Y); - -parameter WIDTH = 0; -parameter S_WIDTH = 0; - -input [WIDTH-1:0] A; -input [WIDTH*S_WIDTH-1:0] B; -input [S_WIDTH-1:0] S; -output reg [WIDTH-1:0] Y; - -integer i, j; - -always @* begin - j = 0; + found_active_sel_bit = 0; for (i = 0; i < S_WIDTH; i = i+1) if (S[i]) begin - Y = B >> (WIDTH*i); - j = j + 1; + Y = found_active_sel_bit ? 'bx : B >> (WIDTH*i); + found_active_sel_bit = 1; end - if (j != 1) - Y = A; end endmodule |