| 摘要 |
A method and apparatus providing a battery backup for a dynamic random access memory (DRAM) cache system (150) that senses the Vcc level supplied through the cache controller (160) to the cache memory (200) and, if Vcc falls below a preset threshold level, the battery backup apparatus (176) switches the cache memory array (200) to a backup battery Vcc source, and a backup refresh control generator unit (177) that is also powered by the backup battery Vcc source. The cache DRAM (200), backup battery (176), and backup refresh generator (177) are physically contained in a single module that can be disconnected from the cache controller (160) and host system (100) while preserving the cache memory contents. The backup system (170) is installed in an operating host system for recovery of the cache memory contents and/or resumption of execution of the program that was running when the Vcc power failure occurred.
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