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Article #23001Re: 030 sync cycles (was : A1200 versus Falcon 030 once again)
From: Stig Vidar Hovland
Date: Fri, 22 Jan 1993 13:57
Date: Fri, 22 Jan 1993 13:57
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In article <1982@enst.enst.fr>, elendir@inf.enst.fr writes: > 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. > Mr. Joern Moe has probably circuit diagrams for the Falcon and in that case he should know what he is talking aboat. With additional hardware, it is possible to terminate an access to 16 bit memory with STERM. Stig Vidar Hovland - stigvi@lise.unit.no
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Newsgroups: comp.sys.atari.st Path: arc1-ca.pugleaf.net!sparky!uunet!mcsun!sunic!ugle.unit.no!lise.unit.no!stigvi From: stigvi@Lise.Unit.NO (Stig Vidar Hovland) Subject: Re: 030 sync cycles (was : A1200 versus Falcon 030 once again) Message-ID: <1993Jan22.135725.4674@ugle.unit.no> Keywords: STERM Sender: news@ugle.unit.no (NetNews Administrator) Organization: Norwegian Institute of Technology References: <H.6a78NGVZTA2@fredrik.atari.no> <1982@enst.enst.fr> Date: Fri, 22 Jan 93 13:57:25 GMT Lines: 15