Systems, circuits and methods for mixed voltages and programmable voltage rails on integrated circuits
First Claim
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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Accused Products
Abstract
An integrated circuit (110) includes, on a single chip, distinct supply voltage terminals and internal on-chip supply conductors connected respectively thereto, including a ground terminal (GND) and terminals for first and second supply voltages (VCC3, VCC5), and a terminal for a selectable supply voltage (VCCDK) and also has a power-good terminal (PWRGOOD5). A plurality of peripheral control circuits (910, 938, 932) are connected by an on-chip internal bus (904). The peripheral control circuits (910, 938, 932) connect to different ones of the internal on-chip supply conductors for operation on the first and second supply voltages (VCC3, VCC5), and the selectable supply voltage (VCCDK). Reset circuitry (2390) is provided for at least one of the peripheral control circuits. A control latch (PMU-- CNTRL) has a bit (VCCDRV5V) to which the reset circuitry (2390) is responsive. The reset circuitry (2390) provides resets for the at least one of the peripheral control circuits (IDERST, FDDRST) as a function of a voltage at the power-good terminal (PWRGOOD5). Other devices, systems and methods are also disclosed.
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Citations
18 Claims
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1. A computer system comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A personal computer comprising:
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an input device; a memory; a display; a power supply having a ground, and first and second supply voltage conductors, and having a power good output; a first integrated circuit having a microprocessor coupled to said input device, said memory, and said display; and a second integrated circuit coupled to said microprocessor, said second integrated circuit 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. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. An electronic wiring board article of manufacture comprising:
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a printed wiring board having a substantially insulative planar board element and conductors in or on said board element; a power supply attached to said printed wiring board having a ground, and first and second supply voltage conductors, and having a power good output; a first integrated circuit attached to said printed wiring board and having a microprocessor; a second integrated circuit coupled to said microprocessor and attached to said printed wiring board said second integrated circuit having; 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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18. An electronic circuit comprising:
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a power supply having a ground, and first and second supply voltage conductors, and having a power good output; first circuitry having a microprocessor; second circuitry, coupled to said microprocessor, having; 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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Specification