[sdiy] Digital topics like PLDs?

Michael E Caloroso mec.forumreader at gmail.com
Tue May 26 04:29:08 CEST 2015


PICs are more convenient coding wise, but PLDs can have faster
propagation times.

MC

On 5/25/15, Tom Wiltshire <tom at electricdruid.net> wrote:
> Are you looking for a PLD solution for a particular reason? I use PICs even
> for jobs like this. A whole pile of glue logic can usually be turned into a
> PIC program of a dozen lines and runs fast enough that unless the original
> logic was really pushing the limits, you'll never know the difference.
>
> That caveat means that a uP works well for replacing glue logic in (for
> example) a sequencer or the control panel of something, but not well for
> replacing the huge amounts of 7000-series logic in something like a PPG.
>
> Tom
>
>
> On 24 May 2015, at 16:17, MTG <grant at musictechnologiesgroup.com> wrote:
>
>> I know we talk about Micros and DSPs a lot, but I wonder if anyone knows
>> anything about simple PLDs. I have 3 or 4 TTL chips that I would like to
>> pop into a PLD. It has to work in an 80's vintage synth so that means I/O
>> is 5v, mostly LSTTL. The TTL chips are surprisingly expensive. pretty much
>> $1 each at Mouser/Digiket/etc.
>>
>> My last encounter with this stuff was a 22v10 design and I see that you
>> can still buy those. Is that a viable route or a waste of time and money
>> versus a similar but newer part. I prefer it to be a DIP package.  Also
>> any software recommendations. I have PLDshell 5.0 on 3.5" floppy but I
>> imagine there is something more current for this stuff.
>>
>> GB
>>
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