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ecp5: Sim model fixes 

Signed-off-by: David Shah <dave@ds0.me>
This commit is contained in:
David Shah 2018-10-18 19:40:02 +01:00
parent 677b8ed3ca
commit d29b517fef
1 changed files with 5 additions and 3 deletions
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8
techlibs/ecp5/cells_sim.v
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@ -265,16 +265,18 @@ module TRELLIS_IO(
output O output O
); );
parameter DIR = "INPUT"; parameter DIR = "INPUT";
reg T_pd;
always @(*) if (T === 1'bz) T_pd <= 1'b0; else T_pd <= T;
generate generate
if (DIR == "INPUT") begin if (DIR == "INPUT") begin
assign B = 1'bz; assign B = 1'bz;
assign O = B; assign O = B;
end else if (DIR == "OUTPUT") begin end else if (DIR == "OUTPUT") begin
assign B = T ? 1'bz : I; assign B = T_pd ? 1'bz : I;
assign O = 1'bx; assign O = 1'bx;
end else if (DIR == "INOUT") begin end else if (DIR == "BIDIR") begin
assign B = T ? 1'bz : I; assign B = T_pd ? 1'bz : I;
assign O = B; assign O = B;
end else begin end else begin
ERROR_UNKNOWN_IO_MODE error(); ERROR_UNKNOWN_IO_MODE error();