Browse Prior Art Database

Enhanced Streaming Data Procedure for the MICRO CHANNEL

IP.com Disclosure Number: IPCOM000106659D
Original Publication Date: 1993-Dec-01
Included in the Prior Art Database: 2005-Mar-21
Document File: 2 page(s) / 67K

Publishing Venue

IBM

Related People

Arimilli, RK: AUTHOR [+2]

Abstract

The following new encodings allow a slave to request the Enhanced Streaming Data (ESD) procedure:

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Enhanced Streaming Data Procedure for the MICRO CHANNEL

      The following new encodings allow a slave to request the
Enhanced Streaming Data (ESD) procedure:

       -SDR(0) -SDR(1)            DEFINITIONS

       1       1     Basic Transfers (200ns)

       0       1     Streaming Data Procedure (100ns)

       0       0     Enhanced Streaming Data Procedure(50ns)

       1       0     Reserved

      During ESD procedure, CONTROL information is
transferred/sampled every other streaming cycle while DATA is
transferred/sampled every streaming cycle.  This allows the CONTROL
information to remain on 100ns boundaries, while the DATA is on 50ns
boundaries.  In order to fully interlock the CONTROL information
boundaries, a master acknowledgement of ESD procedure is required by
the master.  Upon receiving an ESD request by the slave, a master
must activate the opposite the -S0,1 to indicate ESD acknowledgement.
This indicates to the slave that CONTROL is to be transferred/sampled
every other -SD STROBE falling.  The timing diagram (an ESD READ
operation) in the Figure illustrates these concepts.

      The Micro Channel* Architecture contains a high performance
data transfer  protocol called Streaming Data.  With Streaming Data
transfers, 100ns streaming data cycles are attainable.  Described is
a method which further improves the Micro Channel performance by
providing Enhanced streaming Data transfers of 50ns.  With the
Enhanced Streaming Data procedure (and 64 bit data transfers) the
peak Micro Channel bandwidth can be increased to 160 MB/sec.

      The current Streaming Data (SD) protocol r...