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Data Transfer Validity Check for Data Streaming Channels

IP.com Disclosure Number: IPCOM000053697D
Original Publication Date: 1981-Oct-01
Included in the Prior Art Database: 2005-Feb-12

Publishing Venue

IBM

Related People

Authors:
Hopko, RM Lowdermilk, DJ Mitchell, MJ [+details]

Abstract

Data streaming, as implemented in the newest crop of processing systems having a high speed interface architecture, permits data transfers on I/O channels to take place at much higher rates than was previously possible. The DATA IN/OUT tags are used in alternation with SERVICE IN/SERVICE OUT tags, respectively, and the data transfer speed is determined by the rate at which an attached control unit issues, SERVICE IN or DATA IN requests to the channel. In contrast to the normal interlocked mode of data transfer, there is no requirement in data streaming that the control unit wait for the channel to respond with SERVICE OUT or DATA OUT, before raising the next DATA IN or SERVICE IN request.