Re: [Iverilog-devel] The tranif1 test is not right?

[Martin W. <mai...@ma...>]

Both NC-Verilog and Verilog-XL report "PASSED".


Stephen Williams wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> 
> I've been working on some fixes to the tranifX handling in Icarus
> Verilog. I fixed a couple bugs, but now the tranif1.v test in the
> ivtest suite no longer works. I've been puzzling over it, and I now
> think that the test itself is not valid. The meat of the program
> is here:
> 
>    wire pin;
>    pullup   (weak1) (keep1);
>    pulldown (weak0) (keep0);
>    tranif1 (pin, keep1, pin);
>    tranif0 (pin, keep0, pin);
> 
> This is trying to simulate a keeper circuit, the idea being if
> the "pin" is released to HiZ, the previous value will have left
> one of the keepers enabled.
> 
> But I don't believe this should simulate properly. The tranifs
> are not drivers themselves, so if the external pin driver is
> released, "pin" will go to Z, which will close *both* gates and
> pin will stay HiZ.
> 
> Can people who have access try the attached program on the Big 3?
> 
> - --
> Steve Williams                "The woods are lovely, dark and deep.
> steve at icarus.com           But I have promises to keep,
> http://www.icarus.com         and lines to code before I sleep,
> http://www.picturel.com       And lines to code before I sleep."
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v2.0.4-svn0 (GNU/Linux)
> Comment: Using GnuPG with SUSE - http://enigmail.mozdev.org
> 
> iD8DBQFK1JLOrPt1Sc2b3ikRAvxsAJ9zpYB3CFAepTI/oIRI+o7ab6v1lgCgz+iw
> t6NaKNJ8LYrx1W0JSKFr62o=
> =IrDG
> -----END PGP SIGNATURE-----
> 
> 
> ------------------------------------------------------------------------
> 
> ------------------------------------------------------------------------------
> Come build with us! The BlackBerry(R) Developer Conference in SF, CA
> is the only developer event you need to attend this year. Jumpstart your
> developing skills, take BlackBerry mobile applications to market and stay 
> ahead of the curve. Join us from November 9 - 12, 2009. Register now!
> http://p.sf.net/sfu/devconference
> 
> 
> ------------------------------------------------------------------------
> 
> _______________________________________________
> Iverilog-devel mailing list
> Ive...@li...
> https://lists.sourceforge.net/lists/listinfo/iverilog-devel