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Altera_Forum
Honored Contributor
Honored ContributorLE carry chain
I'm trying to implement LE carry chain using low level primitives. L_0:LCELL
PORT MAP (
in0,out0
);
D_0:DFFEAS
PORT MAP(
d=>out0,
q=>delay(0),
c...
Altera_ForumHonored Contributor
Honored ContributorI've got some problem with simulation. In Quartus time simulation it's ok, but in ModelSim there is problem with X values(please take a look at the attachment). It's caused by time volation- example warning from ModelSim:
Warning: */DFFEAS HOLD Low VIOLATION ON DATAIN WITH RESPECT TO CLK;# Expected := 0.084 ns; Observed := 0.074 ns; At : 98.79 ns I guess that ModelSim is right, but due the nature of this project time volations are natural. You can see that he put's 'X' before and after 1-0 and 0-1 transition. Is there a way to trick ModelSim? I'd like to use testbench simulation.
