Hi :-)
Here my newbie question :-) Where can I find PAL with SR instead of D latches ? My ttl simple machine need set and reset functions. Is there a such thing ?
Noob :-)
Where can I find a PAL with SR latch ?
Jan 06, 2006
5 Replies
You can make a SR latch using combinatorial logic. In CUPL it would look like : q = q & !reset # set;
Let say in a PAL20R6A, now do I get rideoff the clock ? I need a strait SR latch :-)
If you don't need the clock, tie it to GND and leave it alone. The same holds for all flipflops with asynchrone preset and clear.
petrus bitbyter
You don't. PALs are extremely obsolete - use a GAL, as each macrocell can be configured as synchronous or asynchronous.
If you really need to use a 20R6, use one of the two non-registered outputs.
configured as
That's what I concluded also :-) Some GALs seem to have SR latches :-)
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