Apparatus for granting either a CPU data bus or a memory data bu

Details Apparatus for granting either a CPU data bus or a memory data bu Apparatus for granting either a CPU data bus or a memory data bu

1996-04-08

1998-03-24

Barry, Lance Leonard

Boots, shoes, and leggings

395288, 36424292, 3642402, 3642384, G06F 1336

Patent

active

057322260

ABSTRACT:
A link system controller is interposed between a PCI bus and the data bus and memory data bus of a personal computer system to normally allow transfer of write information from the PCI bus to DRAM memories on the memory data bus. Whenever a request is made for the transfer of data to the CPU data bus, a CPU bus interface controller requests release of the system from the DRAM controller. The DRAM controller then grants permission or releases control to the CPU bus interface whenever the DRAM controller is not writing data out to the DRAM data bus. When this release is effected, the transfer of write data to the memory data bus is prevented and transfer of data to the CPU data bus is enabled. This prevents simultaneous switching of the devices on both the CPU data bus and the memory data bus, to reduce the generation of noise; so that the operation of the IC system device is not impaired.

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patent: 5392404 (1995-02-01), Thompson
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patent: 5598542 (1997-01-01), Leung

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