Path: utzoo!attcan!uunet!ginger.acc.com!ivucsb!todd
From: todd@ivucsb.sba.ca.us (Todd Day)
Newsgroups: comp.dsp
Subject: Re: Building a DSP board, Part Four: Hooking up RAM & ROM
Message-ID: <1989Sep30.124745.12444@ivucsb.sba.ca.us>
Date: 30 Sep 89 12:47:45 GMT
References: <1989Sep29.051916.7920@ivucsb.sba.ca.us>
Organization: Disillusioned Graduate Hackers, Santa Barbara, CA
Lines: 33

I forgot to mention that the IDT SRAMS I choose were SIPS (single in-line
packages).  They were also 64k x 16bit.  I needed two of them for (one for
X mem, one for Y mem).  They each had 40 pins.  Hookup was quite simple.
First, I put 5 16-pin dips in a row like this:

 ______  ______  ______  ______  ______
/      \/      \/      \/      \/      \ <-- each one of this is a 16 pin dip
oooooooooooooooooooooooooooooooooooooooo

oooooooooooooooooooooooooooooooooooooooo

This gives me two rows of sockets for the SIPS.  Basically, I just connect
each of the adjacent pins like this:

		    X
		    |
oooooooooooooooooooooooooooooooooooooooo
|||||||||||||||||||| |||||||||||||||||||
oooooooooooooooooooooooooooooooooooooooo
		    |
		    Y

The X and Y are the individual chips selects.  The rest of the pins are
power, control signals, address lines, and data lines, which are the same
for both chips.

This arangement takes very little board space and is quite easy to hook up.

-- 

Todd Day  |  todd@ivucsb.sba.ca.us  |  ivucsb!todd@anise.acc.com
"Ya know, some day these scientists are going to invent something
	that can outsmart a rabbit" -- Bugs Bunny