Re: [myhdl-list] Conversion of Signal(intbv(False))

[Jan D. <ja...@ja...>]

Felton Christopher wrote:
>>>
>>> This can be worked around by adding bit width, Signal(intbv(False)
>>> [1:]).  But if this is done the code (or at least the example below)
>>> doesn't work, because the intbv type insn't a bool anymore.  Once the
>>> bit width is added it becomes an integer and the conditions will fail
>>> for a non-bool type.
>> What exactly doesn't work about that? Conversion seems to work fine,
>> and I don't immediately see what would be wrong with the Verilog or  
>> VHDL
>> code.
>>
>> Also, before going into the depth of the matter, what's against
>> simply using Signal(False) for the boolean signals?
>>
> 
> Sorry this is my error, I  was thinking only type intbv was  
> convertible and didn't cross my mind to use Signal(bool).  Quick look  
> through the manual and some past work didn't remind my brain.

Right, perhaps it is useful to post the documentation link for
others reading this:

   http://www.myhdl.org/doc/0.6/manual/conversion.html#supported-types

Even though intbv is the "workhorse" and does many of the things for
which you need a number of different types in other HDLs, it is
not the only type you can and should use.

bool and enum both have its uses and make things more explicit:
bool for boolean (and therefore single-bit) variables, enum
for state variables as in VHDL.

Jan

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     Python as a hardware description language:
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