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Memory Card Select Net Failure Isolation

IP.com Disclosure Number: IPCOM000046500D
Original Publication Date: 1983-Jul-01
Included in the Prior Art Database: 2005-Feb-07

Publishing Venue

IBM

Related People

Authors:
Schettl, MD Svercek, JC Weller, GK [+details]

Abstract

The symptoms of a failing storage card select net in a computer system vary depending on the exact failure (i.e., stuck active, stuck inactive, open interposer, open card, etc.). If several memory types are available on the system, the problem is compounded because the symptom of a failing card select net varies with the memory type. An extensive amount of diagnostic microcode is required to analyze all the symptoms to determine the failing net. The amount and complexity of the diagnostic microcode can be significantly reduced by adding a minimal amount of hardware.