Resources Contact Us Home
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
Integrated monitoring in problem management in service desk
Image processing unit, image processing method and program
Pre-distortion architecture for compensating non-linear effects
Profiled rail for advertising/display units
Synthetic refrigeration oil composition for HFC applications
Light emitting diode having multi-cell structure and method of manufacturing the same
Remotely provisioned wireless proxy
  Randomly Featured Patents
Integrated circuit packaging system having planar interconnect
New carbacycline, process for their production and their use as a drug
Inline handle support
Method and system for preventing fraudulent activities
Casting alloy resistant to corrosion and wear at elevated temperatures
Electric vehicle, and device and method of controlling slip thereof
Polymer compounds and a preparation method thereof
Systems and methods for reducing a signal spectrum tilt
Electrode sealing system for thermoplastic tube
Cache index coloring for virtual-address dynamic allocators