Power management unit including a programmable index register fo

Details Power management unit including a programmable index register fo Power management unit including a programmable index register fo

1994-04-06

2000-02-01

Sheikh, Ayaz R.

Electrical computers and digital processing systems: support

Computer power control

G06F 100

Patent

active

060214988

ABSTRACT:
A power management unit is provided that includes a plurality of configuration registers for storing configuration information to set various operational parameters of the power management unit. A program register is mapped within the configuration space of the computer system and is utilized to store a value which sets the I/O address of the index register. The program register is written during the initialization of the power management unit, and may be associated with a predetermined default value. Once the program register has been set with a value indicating the I/O address of the index register, accesses to the configuration registers are achieved by first writing an offset value to the index register. Subsequently, configuration data may be written into or read out of a designated configuration register by executing an appropriate cycle to the address of the configuration data register, which may be mapped one word location beyond that of the index register. As a result of the programmable index register, the addresses of the index register and the configuration data register within the I/O space of the computer system may be specified via software, thus allowing the system designer greater flexibility with respect to the selection of other peripheral devices incorporated within the computer system.

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Dubois Y.A. et al., "Portable Applications For PC-Compatible Chip Sets"; Wescon Technical Papers, Nov. 1, 1991, vol.35, pp. 471-476.

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