Newsgroups: comp.sys.transputer
From: paul@walker.demon.co.uk (Paul Walker)
Subject: Re: Request for information on DMA controllers
Organization: Paul Walker Consultancy
Date: Wed, 9 Nov 1994 08:23:00 +0000
Message-ID: <784369380snz@walker.demon.co.uk>

In article <1994Nov4.104141.1@ntuvax.ntu.ac.sg>
           asskleong@ntuvax.ntu.ac.sg  writes:

>Hi,
>
>        We are thinking of using some DMA controllers to update a chunck
>of memory in parallel.  The ideal would be some 32-bit DMA controllers
>operating at a frequency higher than 20 MHz as the T805 itself is 32-bit.
>Could anyone shed some light as to whether these DMA controllers do
>exist and, if so, where are they available ?

It could be easier to build your own with PLDs?

The problem with most of the existing DMA controllers is that they are single
channel, or at least very few channels, and it sounds as if you may have 
many channels?

Could you say a little bit more about the application, how many banks of RAM,
whether you want separate DMA to the different banks, what data rate you 
actually need and how many channels you need?

With answers to these questions, it would be easier to help you.

Paul Walker                             "Making Connections"
+44 1275 844 864              paul@walker.demon.co.uk


