Browse Prior Art Database

Memory Verification in a Graphic Adapter

IP.com Disclosure Number: IPCOM000102997D
Original Publication Date: 1990-May-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 1 page(s) / 46K

Publishing Venue

IBM

Related People

Massoudian, K: AUTHOR [+2]

Abstract

Disclosed is a system that verifies the large amount of memory in a graphic adapter of a work station, with emphasis on the critical segments of the memory.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 82% of the total text.

Memory Verification in a Graphic Adapter

      Disclosed is a system that verifies the large amount of memory
in a graphic adapter of a work station, with emphasis on the critical
segments of the memory.

      In this system, memory test patterns are grouped and
prioritized.  Group 1 contains two patterns and group 2 contains four
patterns.  Group 3 contains six patterns and group 4 contains eight
patterns.  Group 1 has the highest priority and group 4 has the
lowest.  Critical memory segments, such as system stack and
initialization areas are identified.  It takes longer time to test
more patterns.  To achieve overall system efficiency, groups 1 and 2
are used in non-critical memory segments and groups 3 and 4 are used
in critical memory segments.

      The number of times that a memory segment is tested, is
determined by the frequency it is accessed.  The critical memory
segments are accessed more frequently, and therefore tested  more
times.  The non-critical memory segments are tested with a few
selected patterns, and the tests are repeated for a fewer number of
times.  The critical memory segments are tested with all desired
combination of patterns, and the tests are repeated for the desired
maximum number of times.  Although the critical memory segments may
be contiguous to the non-critical memory segments, they are tested
nonlinearly.

      A generalized subroutine is used that recognizes the following
parameters: command, pattern, start...