Re: [vhdl-200x] Switch model

From: Rick Munden <munden@FreeModelFoundry.com>
Date: Mon Mar 10 2014 - 12:56:01 PDT
Jim,

Pull up the datasheet for a TI SN74CBT3125D.  I have been asking for
this since the late 1990s.

Rick



On 03/10/2014 07:41 PM, Jim Lewis wrote:
> HI Jakko,
> I would particularly be interested in seeing an example and hardware
> picture of something that requires conditional usage of this.
> 
> I would more likely call it a switch or attachment operation. Calling it
> an assignment is going to make people want to inject delta cycles -
> which is not going to work.
> 
> Jim
> 
> 
> 
>> Hi Brent,
>>
>>
>> What you actually want is a bidirectional assignment (for any resolved
>> type).
>>
>> The problem with the code you listed below, is that you cannot have 2
>> of those assignments in a row, it will lead to wrong results.
>>
>> If you could assign 2 ways (like tran or tranif), then the problem is
>> solved.
>>
>> I'd like to see something like
>>
>> a <=> b [when c else 'Z'];
>>
>> This would ease multiport wires with bidirectional (and conditional)
>> assignments.
>>
>> Jakko
> 
> 

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Received on Mon Mar 10 12:56:19 2014

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