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- Newsgroups: sci.electronics
- Path: sparky!uunet!telebit!eric
- From: eric@telebit.com (Eric Smith)
- Subject: Re: Are there any large PALs/GALs?
- In-Reply-To: jeremym@fraser.sfu.ca's message of Thu, 23 Jul 1992 00:46:41 GMT
- Message-ID: <ERIC.92Jul22204007@iceland.telebit.com>
- Sender: news@telebit.com
- Nntp-Posting-Host: iceland.telebit.com
- Organization: Telebit Corporation
- References: <jeremym.711852401@sfu.ca>
- Date: 22 Jul 92 20:40:07
- Lines: 27
-
- >>On Thu, 23 Jul 1992 00:46:41 GMT, jeremym@fraser.sfu.ca (Jeremy Thomas McDonald) said:
- > I was wondering if there are any PALs/GALs that have a large number of D
- > flipflops.
-
- Yes. How much money do you have? More than the National debt? Good.
-
- > I need to implement two 12-bit counters and a 15-state FSM and and 8-bit
- > register. I also need three 8-bit I/O ports.
-
- If this partions easily, you are much better off using several small PALs.
- The cost and performance will be better. The 8-bit I/O ports are obvious
- candidates for external parts. Surface mount 74HC374s don't take up that
- much room.
-
- If you must do this, you could probably use one of the big Altera parts.
- I'm not sure that an EP1800 will do all this, but I think they've got some
- big MAX parts that will.
-
- Xilinx, Actel, QuickLogic, etc. make FPGAs that can do this.
-
- If you don't already have a design system and programmer for the big parts,
- plan on spending mucho bucks for it. That's another point in favor of using
- multiple small parts. Not only are the parts cheap, there are cheap (and in
- some cases, free) development tools for them.
-
- Cheers,
- Eric
-