( ESNUG 356 Item 1 ) --------------------------------------------- [8/03/00]
Subject: ( ESNUG 355 #13 ) 2nd Plea For Help On Opposite-Input Tri-states
> In the "early" days of ESNUG there was a thread talking about a Synopsys
> bug concerning the usage of tri-state buffers that have 2 enable inputs
> that require opposite logic levels. I just ran into the same problem
> and am trying to find a solution. Was there a solution posted (that I
> didn't find)?
>
> I tried to use the 'pin_opposite' attribute in the library but Design
> Compiler failed to map the tri-state buffers. I tried the 'x_function'
> with the same result. I tried the 'contention_condition' with the result
> that Design Compiler mapped the tri-state buffers but tied one input to
> VCC (as it did without any special attribute).
>
> I think there must be someone who has solved this problem.
>
> - Volker Rzehak
> Texas Instruments Deutschland Germany
From: Volker Rzehak <v-rzehak@ti.com>
John,
Unfortunately I didn't receive any feedback from my post on ESNUG and I'm
not able to solve the problem up to now. I am quite stuck. The only
solution I can think of at the moment is either to do it manually or use
tristate buffers with one input (and bigger area requirements). Help!
- Volker Rzehak
Texas Instruments Deutschland Germany
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