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- Newsgroups: comp.sys.amiga.hardware
- Path: sparky!uunet!hela.iti.org!cs.widener.edu!batman!hellerS
- From: hellerS@moravian.edu (sjh)
- Subject: Re: Data/Instruction Cache & BURST modes on 68030? Why/when?
- Message-ID: <hellerS.725061488@batman>
- Nntp-Posting-Host: batman
- References: <hellerS.724958427@batman> <72192@cup.portal.com>
- Distribution: na
- Date: Tue, 22 Dec 92 17:06:41 EST
- Lines: 15
-
- Thanks to all who wrote me replies on these questions. However, I've gotten
- a few different replies, so I called CSA and asked for the "straight
- answer" and this is what they said. As far as the MMR goes, there is NO
- burst mode capability, regardless of 32-bit memory speed. As far as the
- data/instruction caches go, if you HAVE NO 32-bit memory on the CPU, the
- caches can speed things up a bit, but are essentially useless when working
- with 32-bit DRAM. His suggestion was to LEAVE the CACHES and BURST OFF.
- Several people were pretty certain that 60ns was the magic number for DRAM
- speed to be able to use burst mode. The CSA guy laughed and said that was
- nonsense - it just doesn't exist on the MMR. It was a feature they had
- originally intended to include but decided to leave it out because they
- felt there was virtually no demand for it...why, I don't know. It must work
- on some accellerators, but not the MMR (or the Derringer).
-
- So that's the scoop, direct from the tech-support at CSA.
-