Forrest,

The Lattice Semiconductor datasheet seems to cover the output logic 
macrocells pretty thoroughly 
http://www.latticesemi.com/lit/docs/datasheets/pal_gal/22v10.pdf

Can you describe something more specifically that is missing from/unclear in 
the documentation? I have a text or two that provide some coverage of the 
these devices, but not much more than what is in the datasheet and the usual 
sum-of-products PLD programming.

Richard


----- Original Message ----- 
From: "Forrest W Christian" <forrestc@imach.com>
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Sent: Wednesday, December 02, 2009 5:24 AM
Subject: [EE] 'truth table' for GAL22V10 registered outputs


> I'm trying to use a flip-flop in a GAL22V10 and am having problems with
> making it do what I want.
>
> The output cell on a 22V10 basically is a D flip-flop with asynchronous
> reset, and synchronous preset, which seems straightforward enough.
> Unfortunately it doesn't seem to be working the way I'd expect.....  So,
> I went looking for some documentation... which I sure haven't been able
> to find.   I'm sure I'm making some incorrect assumption about this
> particular D flip-flop, but without docs it's proving difficult to
> figure out.
>
> Is someone aware of a truth table or similar for the output register on
> a 22V10?
>
> Thanks,
>
> -forrest
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