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- Path: sparky!uunet!wupost!cs.utexas.edu!torn!news.ccs.queensu.ca!qucdn!leek
- Organization: Queen's University at Kingston
- Date: Thursday, 23 Jul 1992 21:34:51 EDT
- From: <LEEK@QUCDN.QueensU.CA>
- Message-ID: <92205.213451LEEK@QUCDN.QueensU.CA>
- Newsgroups: sci.electronics
- Subject: Re: Are there any large PALs/GALs?
- References: <jeremym.711852401@sfu.ca>
- Lines: 40
-
- In article <jeremym.711852401@sfu.ca>, jeremym@fraser.sfu.ca (Jeremy Thomas
- McDonald) says:
- >
- >I was wondering if there are any PALs/GALs that have a large number of D
- >flipflops. 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. I want to design a
- >controller to act as a pseudo-Dual port RAM controller, with a high speed
- >20n s RAM chip (single ported) attached to one of the ports on the PAL/GAL,
- >and the PAL/GAL acting as a time slicer for the RAM. One port on the PAL is
- read-only, the other is write-only.
-
- There are the Lattice GAL26V12 with 12 macro cells and runs at 10ns,
- and the smaller 18V10 and 20V10. I don't know about availability and
- price. AMD seems to have fast 7ns GAL chips. I would have recommended
- larger PLD's like iPLD 910 and 85C090 which has 24 macrocells, but they
- might be slower than the GALs.
-
- Lattice also have the new pLSI & ispLSI (Programmable and In-
- System Programmable Large Scale Intergration). They are PLD devices with 96
- registers - 288 registers and 44 to 120 I/O pins. They runs at 70-80 MHz.
- These are pretty new chips. I think the price is about $100 a piece at 100
- quantity. There is an Engineering kit @ $395 which includes a Univeral
- programmer module + a 84-pin PLCC adaptor + ispLSI 1032 sample.
- (ispLSI 1032 - 192 registers, 64 I/O pins)
-
- For more info call Lattice at 1-800-327-8425 ask for info packet# 309.
- (BTW that's 1-800-FASTGAL which they didn't mentioned in their ad.)
-
- >Any help in this area would be much appreciated, as going with external
- >MSI logic eats up tons of board space. Thanks.
-
- Another way of implementing what you are doing is to use a FAST FIFO
- chip. The fastest ones I seen the ads for are at 7ns. Slower ones
- are also available. :) Sharp & Integrated Device Technology make
- these.
-
- >e-mail to: jeremym@fraser.sfu.ca
-
- K. C. Lee
- Elec. Eng. Grad. Student
-