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| abradd | Using "prep; flatten; tribuf -formal" seems to resolve the error I was seeing | 01:20 |
|---|---|---|
| abradd | I noticed that when traces are generated they don't display the tristate port as 'z even when the input conditions mean they should | 01:21 |
| abradd | Is that expected or do I have some other issue? | 01:22 |
| abradd | I saw this in my own code, but started using https://gist.github.com/jix/6ccf5b58f10ce77cf40d9f13ed15db86 as a reference for testing. In it I also see that the tristate port goes to '0 instead of 'z when "en" is low | 01:23 |
| jix | that's expected, the verification infrastructure doesn't actually support 'z so "tribuf -formal" converts it into equivalent logic + assertions to detect drive conflicts | 01:26 |
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| abradd | Ok that makes sense. If I set any signal to 'z or it would otherwise have evaluated to 'z, is it always converted to '0 in the equivalent logic? | 03:16 |
| abradd | I've been testing the code at https://gist.github.com/jix/6ccf5b58f10ce77cf40d9f13ed15db86 and it behaves as expected given your description above, but I have another simple module that seems to be ignoring my "en" signal and I cannot figure out why | 03:17 |
| abradd | It basically boils down to | 03:19 |
| abradd | assign tri_inout = en ? in : 1'bz; | 03:19 |
| abradd | assign out = tri_inout; | 03:19 |
| abradd | with a formal verification section that runs a counter, counts to 3 and covers ( out == 1 && count == 3) | 03:19 |
| abradd | I can also provide the testcase if that is preferred | 03:19 |
| abradd | but it seems the "en" is removed in the design.il file: | 03:20 |
| abradd | connect \out \tri_inout | 03:20 |
| abradd | connect \tri_inout \in | 03:20 |
| abradd | which is what I see if the traces, "out" goes high as soon as "in" does irrespective of "en" | 03:20 |
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