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'RE (2): [a bit OT] GAL programmer schematic ?'
1998\06\10@135718 by Martin Green

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    I believe it stands for Generic Array Logic. It is similar to a PAL
    (Programmable Array Logic), but since it uses an EPROM, EEPROM or
    Flash to set the block connections, it is reprogrammable, unlike a
    PAL, which is OTP. A GAL or PAL is a bunch of logic gates and
    registers in an IC package that can be interconnected by setting bits
    in the EPROM. GAL's are typically used as 'glue logic' to replace many
    individual SSI devices, or to create special purpose registers or
    modules that don't exist off-the-shelf.

    Hope I didn't use too many acronyms for you.


    CIAO - Martin.


______________________________ Reply Separator _________________________________
Subject: RE(2): [a bit OT] GAL programmer schematic ?
Author:  pic microcontroller discussion list <spam_OUTPICLISTTakeThisOuTspamMITVMA.MIT.EDU> at
Internet
Date:    6/10/98 9:08 AM


Question: What does GAL mean?
Please forgive me if it is a stupid question but I'm not sure what this means.


---- PICLIST(a)MITVMA.MIT.EDU's Message ----

               From my saved mail....


               [snip isp-GAL comments]
               just uploaded to our ftp server schematics and
source/object/exe files for a DIY GAL programmer.
               pub/mchip/galprog.zip
               short notice about it also posted to our WWW bulletin
board
               http://sistudio.com/bbs <http://sistudio.com/bbs>
               antti
*       Silicon Studio Ltd.
*       http://www.sistudio.com <http://www.sistudio.com>

1998\06\14@215708 by Martin McCormick

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       Do any of the small development systems work in DOS?  What does the
program file for such a chip look like?  I have this picture in my mind of
a chip containing several of the usual logic gates such as And and Or plus
a few inverters or flip-flops and then some kind of equation to connect them
together in the way desired to build the particular application.  I've been
hearing about GAL's and PAL's for about ten years, but I haven't gotten in
to any actual work with them.  I seem to recall being scared away when I
found out how much the development systems cost.

Martin McCormick WB5AGZ  Stillwater, OK
OSU Center for Computing and Information Services Data Communications Group

1998\06\15@051550 by Pavel Korensky

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At 07:00 12.6.1998 -0500, you wrote:
>        Do any of the small development systems work in DOS?  What does the
>program file for such a chip look like?  I have this picture in my mind of
>a chip containing several of the usual logic gates such as And and Or plus
>a few inverters or flip-flops and then some kind of equation to connect them
>together in the way desired to build the particular application.  I've been
>hearing about GAL's and PAL's for about ten years, but I haven't gotten in
>to any actual work with them.  I seem to recall being scared away when I
>found out how much the development systems cost.

Yep, you have right picture in your mind. GALs are cheap (22V10 is about
USD 3 here) and you can put a lot of SSI and MSI logic in this chip. I am
not sure, but I also think that isp versions are flash (reprogrammable).
There is free version of DOS equation compiler. So, the only thing you need
is a programmer. I did not yet received the Lattice CD, but from their web
page, it seems that their isp22V10 is simply programmable by 5 pins.
I also got the link to some web page, where is the schematic for a simple
programmer. I will try to build one.

Best regards

PavelK

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1998\06\15@072243 by Leon Heller

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In message <PICLIST%.....98061421570806KILLspamspam@spam@MITVMA.MIT.EDU>, Martin McCormick
<martinspamKILLspamDC.CIS.OKSTATE.EDU> writes
>        Do any of the small development systems work in DOS?  What does the
>program file for such a chip look like?  I have this picture in my mind of
>a chip containing several of the usual logic gates such as And and Or plus
>a few inverters or flip-flops and then some kind of equation to connect them
>together in the way desired to build the particular application.  I've been
>hearing about GAL's and PAL's for about ten years, but I haven't gotten in
>to any actual work with them.  I seem to recall being scared away when I
>found out how much the development systems cost.

You can get the latest Lattice development software for their smaller
devices (up to 8000 gates) including their 22V10 ispGAL free from

       http://www.latticesemi.com

All you need to program them is a simple buffered download cable.

Leon
--
Leon Heller: .....leonKILLspamspam.....lfheller.demon.co.uk http://www.lfheller.demon.co.uk
Amateur Radio Callsign G1HSM    Tel: +44 (0) 118 947 1424
See http://www.lfheller.demon.co.uk/dds.htm for details of a simple AD9850
DDS system. See " "/diy_dsp.htm for a simple DIY DSP ADSP-2104 system.

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