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Improved Direct Memory Access Controller Tests Utilizing Signature Analysis

IP.com Disclosure Number: IPCOM000045389D
Original Publication Date: 1983-Mar-01
Included in the Prior Art Database: 2005-Feb-06

Publishing Venue

IBM

Related People

Authors:
Barakat, EH Kindell, CN Locker, HJ O'Donnell, DA Saunders, DM [+details]

Abstract

Signature analysis is a test technique through which faulty components can be identified. The technique, however, cannot be operated successfully on feedback circuits since a direct memory access (DMA) controller utilizes handshaking techniques with both the CPU and the peripherals which are attached to it. Special provisions must be taken to utilize signature analysis techniques on these controllers. This article describes a technique for breaking into the feedback loop for verification of requested acknowledge signals.