Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!watmath!clyde!bellcore!ulysses!allegra!mit-eddie!genrad!decvax!tektronix!tekcrl!vice!tekfdi!videovax!stever
From: stever@videovax.UUCP (Steven E. Rice, P.E.)
Newsgroups: net.micro.68k,net.micro.amiga,net.micro.atari16,net.micro.mac
Subject: Re: The Motorola 68030
Message-ID: <1970@videovax.UUCP>
Date: Wed, 1-Oct-86 11:43:56 EDT
Article-I.D.: videovax.1970
Posted: Wed Oct  1 11:43:56 1986
Date-Received: Sat, 4-Oct-86 08:58:28 EDT
References: <2270@gitpyr.UUCP> <1837@well.UUCP>
Reply-To: stever@videovax.UUCP (Steven E. Rice, P.E.)
Distribution: net
Organization: Tektronix, Comm Group, TV R&D
Lines: 16
Keywords: new motorola chips mmu fast
Xref: watmath net.micro.68k:1920 net.micro.amiga:5085 net.micro.atari16:2305 net.micro.mac:8083

In article <1837@well.UUCP>, Stephen R. Walton (swalton@well.UUCP) writes:

>> 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.

Whoa!!!!!  The 68020 (and presumably the 68030) transfers long words (32 bits,
4 bytes) on its 32-bit data bus.  What you are tripped up by is specmanship!
40 Mbytes/sec is 10 Mlong-words/sec.  This comes to 100 nsec, which is fast,
but doable.

					Steve Rice

----------------------------------------------------------------------------
{decvax | hplabs | ihnp4 | uw-beaver}!tektronix!videovax!stever