[myhdl-list] use constants as signals

[Katrin W. <kat...@s2...>]

Hello,

I need to declare a signal with a constant value at the beginning of  
my program. This signal is needed in an always_comb decorator in  
another function, where it is changed.

There is a problem with the conversion to VHDL, because in VHDL you  
can not declare a signal with a constant value at the beginning of a  
program.
So I've tried to assign the value to the signal in a always_comb  
decorator, but the input signal doesn't change and the always_comb  
decorator is not called.
There is also a problem, if I declare an intbv variable of this  
constant value, because the always_comb decorator can not change intbv  
variables.
Does anybody know a solution to my problem?

I've attached two examples of my problem.

best regards

Katrin

#####################################

def foo1():
   a = Signal(intbv(12)[8:])

   @always_comb
   def bar():
     a.next = 12 # not working because sensitivity list is empty

def foo2():
   a = intbv(12)[8:]

   @always_comb
   def bar():
     b.next = a >> 1 # always_comb cannot handle intbv constants