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I have run into an issue: there is an 8-bit
input bus. The 4 MSBs and the 4 LSBs are related: the LSBs are simply the
inversion of the MSBs. So sel = ~sel, sel = ~sel, etc.
The original code used all 8 bits of sel (for reasons that I can only
guess). There isn't any reason to do this in the behavioral code, and in
fact it makes the code a lot less readable. The problem is that sel is an
input port, so LEC won't pass unless either:
1. I use sel the way it was used in the original code
2. I can tell Conformal the relationship between sel[7:4] and
Do anyone know a way to achieve the second option? I'd guess that conformal
supports this, but I have no idea how.
I see that there is some formatting problem, so I am reposting with numerics replaced by english words:
I have run into an issue: there is an 8-bitinput bus. The 4 MSBs and the 4 LSBs are related: the LSBs are simply theinversion of the MSBs. So sel[seven] = ~sel[three], sel[six] = ~sel[two], etc.The original code used all 8 bits of sel (for reasons that I can onlyguess). There isn't any reason to do this in the behavioral code, and infact it makes the code a lot less readable. The problem is that sel is aninput port, so LEC won't pass unless either: 1. I use sel the way it was used in the original code 2. I can tell Conformal the relationship between sel[seven:four] andsel[three:zero].Do anyone know a way to achieve the second option? I'd guess that conformalsupports this, but I have no idea how.Thanks,Prasad
Hi PrasadHere's one way to handle it in Conformal:add pin constraint one_hot sel sel -goldenadd pin constraint one_hot sel sel -goldenadd pin constraint one_hot sel sel -goldenadd pin constraint one_hot sel sel -goldenWith these set then logic like this would pass: golden assign out1 = sel&sel | sel&sel | sel&sel | sel&sel; revised assign out1 = 1'b0;Chrystian
Chystian, There isn't a way to state inverted equivalence? Seems that would be more appropriate and provide more positive checking.
Hi BryanYep, there is. That's why I said 'here's *one* way' :-)Here's another:add pin equi sel -invert sel -goldenadd pin equi sel -invert sel -goldenadd pin equi sel -invert sel -goldenadd pin equi sel -invert sel -goldenThe end result is the same but you're right that this is more explicit than 'one_hot'.Chrystian
Thanks Chrystian,It was of great help.Prasad.