ref: 4b53b584263c8b7ea997d756e9712bf438bc348b
dir: /galer/proglogik.html/
<html> <head> <title>What are GALs?</title> <meta name="Generator" content="GuideML V1.6"> <meta http-equiv="Content-Type" content="text/html"> </head> <body> <a href="main.html"><img src="toc.gif" alt="CONTENTS" border=0></a><a href="index.html"><img src="index.gif" alt="INDEX" border=0></a><a href="systemreq.html"><img src="prev.gif" alt="PREV" border=0></a><a href="intstruktur.html"><img src="next.gif" alt="NEXT" border=0></a> <hr> <pre> <u>I.1 What are GALs?</u> GALs (Generic Array Logic) are programmable logic devices. By appropriate programming by the user, many standard gate functions can be resolved into a single GAL chip. Assuming you need the following logic functions for your circuit: - AND -Gate with 2 inputs - OR -Gate with 2 inputs - NAND-Gate with 2 inputs - NOR -Gate with 2 inputs Normally you would need FOUR standard TTL-ICs. These functions can be replaced with ONE GAL. The main use of GALs is to make digital circuits as simple as possible, by replacing many standard logic ICs by one or more GALs. A GAL is able, with appropriate programming, to replace all the logic functions, such as for example: AND, OR, XOR, NAND, NOR, inverters, FlipFlops, decoders (especially address decoders), mutiplexers, counters. On top of all the GAL is reprogrammable (at least 100 times), so that the desired logic functions may easily be altered. </pre> <hr> <a href="main.html"><img src="toc.gif" alt="CONTENTS" border=0></a><a href="index.html"><img src="index.gif" alt="INDEX" border=0></a><a href="systemreq.html"><img src="prev.gif" alt="PREV" border=0></a><a href="intstruktur.html"><img src="next.gif" alt="NEXT" border=0></a> </body> </html>