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Article #22985

030 sync cycles (was : A1200 versus Falcon 030 once again)

#22985
From: elendir
Date: Fri, 22 Jan 1993 09:47
14 lines
825 bytes
Joern Moe writes
] In the falcon they use sync 
] mode on a 16 bit bus. This gives a 4 clock cycle for each longword
] access to the bus. This implies a 25% reduction in performance, not 50%.

 That is wrong. Synchrone cycles on the 68030 (i.e. those terminated by STERM  
rather than DSACK) must be 32-bit wide. Refer to the 030 User s Manual. There  
is no other way than DSACK to end a 16-bit wide exchange.

Vincent.

--

 In memoria di mori di Furiani.
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Message-ID: <1982@enst.enst.fr>
Path: arc1-ca.pugleaf.net!sparky!uunet!mcsun!julienas!enst!inf.enst.fr!elendir
References: <H.6a78NGVZTA2@fredrik.atari.no>

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Path: arc1-ca.pugleaf.net!sparky!uunet!mcsun!julienas!enst!inf.enst.fr!elendir
From: elendir@inf.enst.fr
Newsgroups: comp.sys.atari.st
Subject: 030 sync cycles (was : A1200 versus Falcon 030 once again)
Keywords: STERM
Message-ID: <1982@enst.enst.fr>
Date: 22 Jan 93 09:47:48 GMT
References: <H.6a78NGVZTA2@fredrik.atari.no>
Sender: news@enst.enst.fr
Lines: 15