Re: [SI-LIST] : Advice for long bus?

Thomas Wirschem (Thomas.Wirschem@nsc.com)
29 Apr 1999 00:45:35 -0700

Chris,

there is a recent article called "Sorting Out Backplane Driver Alphabet Soup"
in Electronic Design, that is describing pretty much what you're looking for,
comparing technologies of TTL, LVT, PECL, GTL, BTL, LVDS,...
It's reprinted on National's homepage @
http://www.national.com/appinfo/lvds/pages/0,1798,102,00.html

Regards

Thomas

National Semiconductor - Europe

cbobek@cadence.com on 28-04-99 19:12:00
To: si-list@silab.eng.sun.com@Internet
cc: (bcc: Thomas Wirschem/Europe/NSC)
Subject: [SI-LIST] : Advice for long bus?

We are designing a board that has a micro with a 32 bit address/data bus
which will ultimately go to 14 loads (memory, flash, various other devices).
The bus speed hasn't been decided yet, but it will be either 33 or 66MHz.
Most everything is 3V logic.

Question: Would it be advantageous to use an alternative signaling scheme
(such as GTL) instead of the LVTTL? There will probably be buffer/drivers
anyhow since the micro won't be able to drive 14 loads.

Does anybody have any other suggestions/advice? I realize you may need more
info for this, but I want to keep this brief/high-level.

Thank you,

Chris

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