Browse Prior Art Database

Micro Channel Slave Interface Chip Burst Termination Method

IP.com Disclosure Number: IPCOM000101049D
Original Publication Date: 1990-Jun-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 1 page(s) / 29K

Publishing Venue

IBM

Related People

Casavant, PC: AUTHOR [+5]

Abstract

By properly terminating a burst transfer cycle while isolating adapter logic from the MICRO CHANNEL* bus, designers are freed from consideration of timing protocol involving recovery of BURST signal lines before a COMMAND signal is sent.

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This is the abbreviated version, containing approximately 100% of the total text.

Micro Channel Slave Interface Chip Burst Termination Method

       By properly terminating a burst transfer cycle while
isolating adapter logic from the MICRO CHANNEL* bus, designers are
freed from consideration of timing protocol involving recovery of
BURST signal lines before a COMMAND signal is sent.

      A MICRO CHANNEL slave interface chip isolates an adapter
circuit which provides I/O WRITE and READ signals (occurring after
ACTIVE status on the MICRO CHANNEL) from MICRO CHANNEL bus signals
and timing requirements.  By requiring the adapter to release its
"Local Bus Request" during the next to last required transfer, BURST
release is performed after ACTIVE status for the last transfer.
Thus, a designer is assured of sufficient time between BURST and
COMMAND signals for complete line recovery.

      The adapter deactivates its "Local Bus Request" signal with one
more transfer to be made.  When an active PREEMPT signal forces the
adapter to give up the MICRO CHANNEL bus at this time, a MICRO
CHANNEL slave interface chip senses the condition and performs the
last transfer without further assistance from the adapter logic.
*Trademark of IBM Corp.