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From: cruess@oakhill.UUCP (Michael Cruess)
Newsgroups: net.micro.68k
Subject: Re: Lockup in Read-Modify-Write with a PMMU
Message-ID: <749@oakhill.UUCP>
Date: Fri, 15-Aug-86 17:17:30 EDT
Article-I.D.: oakhill.749
Posted: Fri Aug 15 17:17:30 1986
Date-Received: Sun, 17-Aug-86 07:24:46 EDT
References: <6009@fortune.UUCP>
Reply-To: cruess@oakhill.UUCP (Michael Cruess)
Organization: Motorola Inc. Austin, Tx
Lines: 8

Old versions of the MMB (manufactured more than about 2  years  ago)  would
lock  up.  Newer versions of the MMB do not.  The PMMU (68851) does not and
never has.  Please see *MC68851 Paged Memory Management Unit User's Manual*
Section 6.3.1.7 READ-MODIFY-WRITE (RMW) CYCLE.

Michael Cruess                                              oakhill!cruess
Motorola, Inc.
Microprocessor Products Group