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From: grr@cbmvax.UUCP (George Robbins)
Newsgroups: comp.sys.amiga
Subject: Re: Dma Design Advice Wanted
Message-ID: <2207@cbmvax.UUCP>
Date: Wed, 12-Aug-87 08:46:27 EDT
Article-I.D.: cbmvax.2207
Posted: Wed Aug 12 08:46:27 1987
Date-Received: Fri, 14-Aug-87 05:29:17 EDT
References: <329@io.UUCP>
Reply-To: grr@cbmvax.UUCP (George Robbins)
Distribution: world
Organization: Commodore Technology, West Chester, PA
Lines: 21

In article <329@io.UUCP> ebr (Evan B. Ross) writes:
> I've been looking at the signetics Intelligent Multiple Disk Controller
> (imdc - 68454) and thinking about building a hard-disk interface
> for my amiga.  The real question, however, is whether or not the
> imdc's dma will work in the amiga environment.
> The expansion spec tends to be a bit vague on some of the signal
> timings and I was wondering if anyone had any comments/advice about
> hooking up dma masters.
> Can the amiga cope with a dma master is running asynchronously to 
> the 68000 clock?

The Amiga expansion bus was designed with the standard Motorola DMA controller
chip in mind.  You should be able to get a compatible chip to work without too
much trouble.  Note that the Amiga implementation is *no* asynchronous, so you
may need to add additional logic, particularly in the area of gating data to or
from the bus.

-- 
George Robbins - now working for,	uucp: {ihnp4|seismo|rutgers}!cbmvax!grr
but no way officially representing	arpa: cbmvax!grr@seismo.css.GOV
Commodore, Engineering Department	fone: 215-431-9255 (only by moonlite)