Take a minimal example:
always @*
if (in) q=d;
We know a latch would be inferred. But, since there's no clock signal, why is the latch relying on it? How can we decide which level it is sensitive to?
A latch is inferred when the assignment conditions are not fully specified. But why does it depend on the level of the clock signal?
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The latch is not relying on a clock. In your code, the latch is enabled when the
insignal is 1. That meansqfollows thedsignal.When
in=0,qdoes not followd.qretains the previous value it had whenintransitioned to 0.Synthesizable constructs has a good description also; see the Transparent latch example.