[Simulavr-devel] [patch #5736] Glue code to use simulavrxx from verilog

[Onno Kortmann]

Follow-up Comment #2, patch #5736 (project simulavr):

Hi,

I have now debugged this a bit further. It seems that it is not a problem of
the verilog interface but of the behaviour of input and output pins with the
mirrornet. SimulavrXX does not seem to update the input state of a pin
immediately after the output state has been set. Apparently, there is a delay
and the pin state gets lost. I connected the inputs to the outputs in my
verilog simulation, which then fed the values back into the simulavr in the
second "in" opcode. If I remove this, it does not work at all.

Apparently, you already have thought about this behavior, as I found this
line in hwport.cpp

unsigned char GetPin() { CalcPin(); return pin; } 

with the call to "CalcPin()" commented out. If I use it again, the loop.v
file seems to be working properly.


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