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Programming Arrangement to Set Priorities Among Devices

IP.com Disclosure Number: IPCOM000063514D
Original Publication Date: 1985-Mar-01
Included in the Prior Art Database: 2005-Feb-18

Publishing Venue

IBM

Related People

Authors:
Shaughnessy, JP [+details]

Abstract

An arrangement is described in which the priority of a number of related devices may be set by programming. Assume, for example, that the environment allows adapter cards in any of eight card slots in a system board. Each card is assigned a default priority based on the card slot number 0 - 7, with 7 being the highest priority, as shown in the table below. (Image Omitted) The normal method of re-ordering priority is to assign a binary code to each device which is wide enough to cover all combinations. For eight devices 3 bits would be required for a total of 24 register bits. If, however, only several high priority devices are used, then the above solution is not cost effective. The new arrangement only requires one register bit per device.