Information processing apparatus capable of holding storage cont

Details Information processing apparatus capable of holding storage cont Information processing apparatus capable of holding storage cont

1995-05-09

1996-12-17

Robertson, David L.

Static information storage and retrieval

Magnetic bubbles

Guide structure

365222, G06F 1300

Patent

active

055862870

ABSTRACT:
The invention provides an information processing apparatus which is equipped with PSRAM (pseudo static random access memory) having a self-refresh mode and which is capable of holding storage contents of the PSRAM even when a CPU system clock generator comes to an abnormal halt. The information processing apparatus has a self-refresh setter which produces an output signal of a high or low specific level when the system clock generator is oscillating, and which, when the system clock generator stops oscillation, inverts the level of the output signal after a certain time elapse since the stop of oscillation. The information processing apparatus further has logic circuits for holding a chip-enable signal at a level representing that the PSRAM is not accessed, and holding a refresh signal at a level representing that the PSRAM is refreshed, respectively, after a certain time elapse since the system clock generator stops oscillation, based on an output of the self-refresh setter.

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patent: 5206830 (1993-04-01), Isobe et al.
patent: 5379400 (1995-01-01), Barakat et al.
patent: 5418920 (1995-05-01), Kuddes
patent: 5473770 (1995-12-01), Vrba

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