Where can I find a PAL with SR latch ?

[:-)]

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

 

[Mike Harrison]

On Fri, 06 Jan 2006 01:42:38 -0500, "" <a@b.c> wrote:

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

You can make a SR latch using combinatorial logic.
In CUPL it would look like :
q = q & !reset # set;

 

[:-)]

Mike Harrison wrote:

On Fri, 06 Jan 2006 01:42:38 -0500, "" <a@b.c> wrote:


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


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

 

[petrus bitbyter]

"" <a@b.c> schreef in bericht
news:_5Fvf.9404$vN4.971490@wagner.videotron.net...

Mike Harrison wrote:
On Fri, 06 Jan 2006 01:42:38 -0500, "" <a@b.c> wrote:


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


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

 

[Mike Harrison]

On Fri, 06 Jan 2006 20:48:51 -0500, "" <a@b.c> wrote:

Mike Harrison wrote:
On Fri, 06 Jan 2006 01:42:38 -0500, "" <a@b.c> wrote:


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


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

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.

 

[:-)]

Mike Harrison wrote:

On Fri, 06 Jan 2006 20:48:51 -0500, "" <a@b.c> wrote:


Mike Harrison wrote:

On Fri, 06 Jan 2006 01:42:38 -0500, "" <a@b.c> wrote:



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


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


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.

That's what I concluded also
Some GALs seem to have SR latches