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From: dillon@CORY.BERKELEY.EDU (Matt Dillon)
Newsgroups: net.micro.68k,net.micro.amiga,net.micro.atari16,net.micro.mac
Subject: Re: The Motorola 68030
Message-ID: <8609262336.AA01693@cory.Berkeley.EDU>
Date: Fri, 26-Sep-86 19:36:36 EDT
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Posted: Fri Sep 26 19:36:36 1986
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>From: swalton@well.UUCP (Stephen R. Walton)
>>The bus data transfer rate of the 68030 is 40 Mbytes/sec.
>
>Think about this.  That's a memory access time of 25 nanoseconds, more than
>4 times as fast as the memory we use in our PC's, Macs, Amigas, and Apples.

	100ns access time @ 40 Mbytes/sec (remember: 32 bit data bus).  I
think that the quickest transfer is 64 Mbytes/sec, which would come out to
about 62ns access time.  This means that your rams actually have to be a bit
faster when you take into account bus buffering.  It isn't unreasonable, and
I think you'd be able to (finally) take advantage of dynamic-ram's block-read
ability.

	I especially like the fact that they do MMU address translation in
parallel with checking the cache.  Anybody know what kind of page-table
cache the MMU has?

							-Matt