March 18, 1991						X3T9.2/91-   R0

	To:		John Lohmeyer, Chairman, X3T9.2

	From:		Bill Galloway
			Summus Computer Systems
			17171 Park Row
			Suite 300
			Houston, TX 77084

	Subject:	Clean up of 5.6.13 MESSAGE PARITY ERROR


	The use of the word "byte" is inappropriate at certain times when 
	referring to messages.  A distinction need to be made between a
	message and message byte.  I propose the folling re-wording of
	section 5.6.13.


	Section 5.6.13 MESSAGE PARITY ERROR

		The MESSAGE PARITY ERROR message is sent from the initiator
	to the target to indicate that the last message it received contained
	a byte with a parity error.

		In order to indicate its intentions of sending this message,
	the initiator shall assert the ATN signal prior to its release of the
	ACK signal for the REQ/ACK handshake of the message byte that has the
	parity error.  This provides an interlock so that the target can
	determine which message contained the parity error.  If the target
	receives this message under any other circumstance, it shall signal a
	catastrophic error condition by releasing the BSY signal without any
	further information transfer attempt (see 5.1.1).

		If after receiving the MESSAGE PARITY ERROR message the target
	returns to the MESSAGE IN phase before switching to some other phase,
	the target shall re-send the entire message that contained the parity
	error.