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Systems, circuits and methods for mixed voltages and programmable voltage rails on integrated circuits

  • US 5,734,919 A
  • Filed: 08/29/1996
  • Issued: 03/31/1998
  • Est. Priority Date: 12/22/1994
  • Status: Expired due to Term
First Claim
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1. A computer system comprising:

  • a power supply having a ground, and first and second supply voltage conductors, and having a power good output; and

    a peripheral control chip including;

    distinct supply voltage terminals and internal on-chip supply conductors coupled respectively thereto, including a ground terminal coupled to said power supply ground and terminals for first and second supply voltages coupled to said power supply first and second supply voltage conductors, and a terminal for a selectable supply voltage coupled to said power supply;

    a power-good terminal coupled to said power supply power-good output;

    a plurality of peripheral control circuits and an on-chip internal bus coupling said plurality of peripheral control circuits, said peripheral control circuits coupled to different ones of said internal on-chip supply conductors for operation on said first and second supply voltages, and said selectable supply voltage wherein a selectable voltage is provided to peripherals coupled to said peripheral control circuits that are coupled to said selectable supply voltage;

    reset circuitry for at least one of said peripheral control circuits; and

    a control latch having a bit to which said reset circuitry is responsive, said reset circuitry providing resets for said at least one of said peripheral control circuits as a function of a voltage at said power-good terminal.

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