Browse Prior Art Database

Variable Packets for Bus Control Unit

IP.com Disclosure Number: IPCOM000036517D
Original Publication Date: 1989-Oct-01
Included in the Prior Art Database: 2005-Jan-29

Publishing Venue

IBM

Related People

Authors:
Leung, WL [+details]

Abstract

A variable size packet allocation scheme is disclosed for a Bus Control Unit (BCU). In a BCU that controls an I/O bus with a queued interface which has many I/O bus units (IOBUs) or I/O processors (IOPs), the BCU is attached to a variety of IOPs with different attributes (i.e., work- stations, communication, DASD, etc). These different IOPs could (Image Omitted) present to the BCU a different packet size for data transfer on each bus operation. For example, it is possible to have a system which could support a packet size of 256 bytes in the future coexisting on the same I/O bus with IOPs that support 16-byte packets. (Image Omitted)