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- Path: sparky!uunet!cs.utexas.edu!torn!news.ccs.queensu.ca!qucdn!leek
- Organization: Queen's University at Kingston
- Date: Thursday, 10 Sep 1992 10:34:44 EDT
- From: <LEEK@QUCDN.QueensU.CA>
- Message-ID: <92254.103444LEEK@QUCDN.QueensU.CA>
- Newsgroups: sci.electronics
- Subject: Re: GAL LOGIC
- References: <R3sTqB1w164w@sys6626.bison.mb.ca>
- <92253.131631LEEK@QUCDN.QueensU.CA> <1992Sep9.200458.8595@adobe.com>
- Lines: 72
-
- In article <1992Sep9.200458.8595@adobe.com>, pngai@adobe.com (Phil Ngai) says:
- >
-
- I would assume that this post is a reply to mine...
-
- >Would you program an Intel EPROM with a Toshiba algorithm?
-
- Not really if I know my chip is an Intel. I haven't seen the Toshiba
- algorithm for EPROM, but I do know that NS programming algorithm is
- significantly different. They use 6.25V 100uS pulses and no overpulse.
- Programming a chip other than the recommended parameters from the
- manufacturer might cause prematured aging and might overstress the
- chip itself causing reliability problems in the long run.
-
- BTW a lot of the EPROM chips have the manufacturer ID as well as
- the product ID. This tells any good programmer the type of
- algorithm to use. (My homebrew programmer does that, but none of
- the PD/magnezine even mentioned it.)
-
- >What if Toshiba had trademarked "EPROM", would that make
- >any difference?
-
- What about Intel's FLASH (TM). It is some sort of field programmable
- ROM that follows the similar pin out, but can be reprogramed without
- the need for UV. Would you program it blindly the same way as
- Toshiba's EPROM ? What about battery backed SRAM ? FRAM ?
-
- A trademark identifies a line of products so that it won't be confused
- with something similar. I mean is there any difference between
-
- PAL16V8 (one-time programmable, fuse based, AMD)
- GAL16V8 (EEPROM based, erasable, Lattice)
- ispGAL16V8 (EEPROM based, but with 4 extra pins for in system
- programming, Lattice)
-
- There is also a CMOS EPROM based chip that has to be erased by UV.
-
- Once the chips are programmed, they are pretty much the same. The
- difference is the process they are maded. This affects the programming
- parameters, interfaces and whether or not they can be reprogrammed.
-
- I can't just go into a store and ask for 16V8 and expect the product
- I wanted. On the other hand I did specify GAL16V8 and got PALCE16V8.
- I could have asked my Credit Card company to cancel payment as I
- didn't get what I specified. a Cyrus 486 is the same as an Intel 486?
- (Cyrus 486 is sort of stripped down Intel 486 workalike in a 386 pin out.)
-
- >What's your definition of GAL anyway?
-
- GAL(TM) stands for Generic Array Logic. Trademarked by Lattice and
- second sourced by National Semiconductor and SGS-Thomas (sp?).
- The GAL prefix is marked implictly on the chip and is the prefix part
- of the part#.
-
- PALCE(TM) by AMD and their chip has PALCE as the prefix part of their
- part number.
-
- Any of the companies can sue if their competitor put on their
- trademark to confuse the comsumer. Intel did that to AMD, but 386
- the number cannot be tradmarked. On the other hand, OverDrive, FastCad
- etc can be.
-
- >My opinions are my own.
-
- Vote for Murphy Brown !!
-
- K. C. Lee
- Elec. Eng. Grad. Student (in a place called Canada...)
-
- PAL, PALCE: tradmarked by AMD.
- GAL, ispGAL: trademarked by Lattice
- OverDrive, FastCad: Trademarked by Intel
-