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Browse Prior Art Database

Extended Bus Transport Mechanism Request Response Control Block for High Performance I/O Processors

IP.com Disclosure Number: IPCOM000099567D
Original Publication Date: 1990-Feb-01
Included in the Prior Art Database: 2005-Mar-15
Document File: 3 page(s) / 96K

Publishing Venue

IBM

Related People

Huss, FL: AUTHOR [+3]

Abstract

An extended bus transport mechanism (BTM) request response control block (RRCB) architecture improves the performance of future I/O processors (IOPs) by optimizing the usage of hardware direct memory access (DMA) resources and by reducing required microcode intervention.

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This is the abbreviated version, containing approximately 52% of the total text.

Extended Bus Transport Mechanism Request Response Control Block for High Performance I/O Processors

       An extended bus transport mechanism (BTM) request
response control block (RRCB) architecture improves the performance
of future I/O processors (IOPs) by optimizing the usage of hardware
direct memory access (DMA) resources and by reducing required
microcode intervention.

      A System Product Division (SPD) BTM provides a transport
mechanism to be used by the Inter-Process Communication Facility to
transport data across the IBM SPD I/O bus.  The SPD BTM defines the
set of bus unit messages and data structures for moving data across
the SPD I/O Bus between requestor's and server's that reside in
different processors on the bus.  A processor may be either a bus
control unit or another bus unit on the SPD I/O bus.  Bus error
recovery procedures are also defined.

      The SPD BTM is unaware of the format and content of any device
specific or I/O processor specific data that is moved between the
requestor and the server.  The SPD BTM provides communication
capability between bus units if one has master DMA capability and the
other has slave DMA capability.

      The BTMs in two different I/O processors' communicate on the
SPD I/O bus via bus unit messages and RRCBs.  A bus unit message
initiates all communications between bus units on the SPD I/O bus.
The bus unit message provides the basic information for further
communication that may require using DMA facilities. ...