SPECIALIZED HARDWARE AND SOFTWARE TO TEST SIMM'S MANUFACTURED USING NON COMPLIANT MEMORY CHIPS

摘要

SPECIALIZED HARWARE AND SOFTWARE TO TEST SIMM'S MANUFACTURED USING NON COMPLIANTMEMORY CHIPSA test system for SIMM memory modules assembled by use of failing memorychips, characterized in that, for ascertaining the failure rate and the related addresses, a circuitry is provided which comprises, for a reference write phase, a pattern register ( 10) having a 32 bit input from the data bus and a 48 bit output to a pattern inverter ( 11 ) also having a 48 bit output (Do",) and, for a comparison write phase, a pattern inverter (13) having a 48 bit input (Din) connected to a data comparator (14) and, through said comparator, to an error coder, having a 32 bit output to the data bus.Figure 1