Computer memory system with a low power down mode

  • US 6,243,315 B1
  • Filed: 12/31/1999
  • Issued: 06/05/2001
  • Est. Priority Date: 12/31/1999
  • Status: Expired due to Term
First Claim
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1. A memory system for use in a computer system, said memory system comprising:

  • a plurality of volatile solid state memory devices that retain information when an electrical power source is applied to said memory devices within a predetermined voltage range and capable of being placed in a self refresh mode;

    said memory devices having address lines and control lines;

    a control device for selectively electrically isolating said memory devices from respective address lines and respective control lines so that when said memory devices are electrically isolated, any signals received on said respective address lines and respective control lines do not reach said memory devices; and

    a memory access enable control device coupled to said control device and to said control lines for determining when said memory system is not being accessed and for initiating a low power mode for said memory system wherein said control device electrically isolates said memory devices and places said memory devices in said self refresh mode, thereby reducing the amount of electrical energy being drawn from an electrical power supply for said computer system.

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