Vlsi Technology, Inc.

Rishi Nalubola

Franklyn H Story

Scott E Harrow

Gary A Walker

James J Jirgal

The present invention relates to a system and method for supporting DMA I/O devices. A PCI-PCI bridge is provided to support DMA I/O devices on the PCI bus. Through the use of two signal lines and a serial link, DMA transfers may be accomplished over the PCI bus. A PCI-ISA dock bridge is also provided to allow the system to support DMA I/O devices and ISA masters (i.e., any device including DMA I/O devices on the ISA bus that generates ISA cycles) on the ISA bus.

System for supporting DMA I/O device using PCI bus and PCI-PCI bridge

A digital power management system for an analog-to-digital converter operates to cause the sample rate of the analog-to-digital converter to function at an original desired frequency so long as changing input signals are present. Whenever activity at the input of the analog-to-digital converter ceases to change, the system automatically decreases the clock signal sampling rate to a slower clock frequency, or shuts down the application of clock signals. This conserves power until a change in the analog input is detected, whereupon the system automatically increases the sample clock frequency back to the original frequency.

Digital power management system

An interrupt based positioning system for a joystick. A potentiometer is coupled to the joystick for supplying a voltage signal representative of a current position of the joystick. An analog-to-digital converter changes the voltage signal to a digital voltage signal which is then stored in a register. Interrupt generation logic monitors the output of the register and generates a position interrupt signal when the digital voltage signal stored in the register indicates a change in the axial position of the joystick.

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Phoenix, AZ, United States of America

Rishi Nalubola