Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Computer system having a bridge between two buses with a direct memory access controller and an alternative memory access controller










Image Number 3 for United States Patent #5621902.

A computer system having a peripheral controller interconnect (PCI) bus and an industry standard architecture (ISA), with ISA compatible devices coupled to the ISA bus, is provided with a first bridge coupled between the PCI and ISA buses. The first bridge has a first direct memory access (DMA) control circuit for controlling DMA transfers with the ISA devices. In order to achieve expanded compatibility with other types of devices, the system is also provided with an expansion bus, such as a Microchannel bus, with Microchannel compatible devices coupled to the Microchannel bus. A second bridge is coupled between the PCI and the Microchannel buses. This second bridge has a second DMA control circuit that controls DMA transfers with the ISA devices and with the Microchannel devices. Software disables the first DMA control circuit such that only the second DMA control circuit controls DMA transfers within the computer system.








 
 
  Recently Added Patents
Mobile browser context switching
Hybrid fin field-effect transistor structures and related methods
Error detection and recovery tool for logical volume management in a data storage system
Method for computer-based determination of a position in a map, navigation device and mobile radio telephone
Chair
Techniques for image segment accumulation in document rendering
Monitoring system
  Randomly Featured Patents
Combined storing, transporting, exposing and processing apparatus for camera
Method and system for load balancing for determining a sales forecast by selecting a synchronous or asynchronous process based on a type of event affecting the sales forecast
Sprinkler
Twin-cell flash memory structure and method
Driver's arousal level estimating apparatus for vehicle and method of estimating arousal level
IC package with dual heat spreaders
Process and device for the reduction of energy consumption in the operation of spinning elements
Toner cartridge
Image reading apparatus utilizing three color channel circuitry to capture four color channels of image data
Automatic reading tutoring with parallel polarized language modeling