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--- In LTspice@..., "Rose, Michael (Michael)"
<mrose2@a...> wrote:

I just wanted to pass along a little tip when using DFLOP special

function models. The rise and fall times default to 0 which will
cause incorrect switching when the flops are cascaded. You have to
add a Trise=xx value to the flop's Spiceline. According to the help,
Tfall will default to specified Trise so does not need to be
explicitly specified. Hopefully this might help save a bit of head-
sratching
.

Hello Michael,
I always prefer to specify a delay time for each D-flipflop or any
other digital gate. I don't think that Tr and Tf are necessary if you
already have specified Td.

Example: Td=1ns

Best Regards
Helmut