raoul@eplunix.UUCP (Nico Garcia) (04/24/91)
In article <1991Apr23.013116.3769@nntp-server.caltech.edu>, josephc@nntp-server.caltech.edu (Simplelogic (Joseph)) writes: > My problem is that a couple of 74LS gates will already add up to about 40ns > to the access time... Ergo, wait states - something that I don't want > to have if I can get away without it. Hmmm. I don't know how the clever digital people did it, but what's the net delay on a PAL down to these days? Also, can you cleverly run your gates off the previous clock cycle or the latter half of it? It's a bit of a kludge, but it might work.... -- Nico Garcia Designs by Geniuses for use by Idiots eplunix!cirl!raoul@eddie.mit.edu
lpdjb@brahms.amd.com (Jerry Bemis) (04/25/91)
In article <1067@eplunix.UUCP> raoul@eplunix.UUCP (Nico Garcia) writes: >In article <1991Apr23.013116.3769@nntp-server.caltech.edu>, josephc@nntp-server.caltech.edu (Simplelogic (Joseph)) writes: >> My problem is that a couple of 74LS gates will already add up to about 40ns >> to the access time... Ergo, wait states - something that I don't want >> to have if I can get away without it. > >Hmmm. I don't know how the clever digital people did it, but what's >the net delay on a PAL down to these days? Also, can you cleverly >run your gates off the previous clock cycle or the latter half of >it? It's a bit of a kludge, but it might work.... > > >-- > Nico Garcia 5nS PALs are out these days. Call AMD at 800 222-9323
henry@zoo.toronto.edu (Henry Spencer) (04/27/91)
In article <1991Apr23.013116.3769@nntp-server.caltech.edu>, josephc@nntp-server.caltech.edu (Simplelogic (Joseph)) writes: > My problem is that a couple of 74LS gates will already add up to about 40ns > to the access time... Ergo, wait states - something that I don't want... The original article of this hasn't wandered into zoo yet -- either we've got a propagation glitch or it had illegal headers and never made it -- but insofar as I understand the problem out of context, have you considered a faster TTL family like 74F? 74F is probably going to be less hassle than getting something like a PAL blown. -- And the bean-counter replied, | Henry Spencer @ U of Toronto Zoology "beans are more important". | henry@zoo.toronto.edu utzoo!henry