International Business Machines Corporation

Shinji Ohishi

Masahiko Nomura

Toshiaki Fukushima

A memory access control apparatus, which is employed for a computer system in which an expansion memory can be installed in addition to a standard memory and which controls the access to the memory by one or more signal lines, comprises an identification circuit for reading identification data of the installed expansion memory, a determination circuit for determining the optimal output current values for the signal lines based on the identification data; and a memory controller for adjusting the output current values of the signal lines based on the results obtained by the determination means. Even when multiple types of expansion memories (DIMM cards) whose memory capacities and memory chip arrangements are different are installed, the waveforms and the timings for the output signal lines (RAS, CAS, WE, and MA) of the memory controller can be dynamically compensated for.

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Yamato, Japan

Shinji Ohishi