Data write control means

Details Data write control means Data write control means

1993-02-02

1994-09-20

Fleming, Michael R.

Static information storage and retrieval

Magnetic bubbles

Guide structure

395425, 365226, 364DIG1, 3642466, 3642469, 3642735, 3642662, G06F 1216

Patent

active

053496698

ABSTRACT:
The present invention relates to a data protection (310) for preventing data from being erroneously written in a data holding circuit (307). A data protection circuit (311) receives a data protection set release select signal Sa provided by a processor (330), thereby causing a second timer (316) to start timing. The data protection circuit (311) further detects the level of a chip select signal CS provided by a power supply monitoring circuit (320) after the second timer (316) timed the time interval T2 and provides a data protection signal DP corresponding to the signal Sa to the data holding circuit (307) only in the case that the data protection circuit (311) judged that the main power supply (305) is at normal state.

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