Methods and apparatus for signaling to switch between...

Details Methods and apparatus for signaling to switch between... Methods and apparatus for signaling to switch between...

2006-03-28

2006-03-28

Perveen, Rehana (Department: 2111)

Electrical computers and digital data processing systems: input/

Intrasystem connection

Bus expansion or extension

C710S305000, C710S062000, C710S066000

Reexamination Certificate

active

07020726

ABSTRACT:
The present invention provides an apparatus and method for selecting bus-width formats. In an exemplary preferred embodiment of the invention, the circuit includes a bus controller configured to provide a first bus-width control signal to select a first bus-width. The circuit also includes a bus controller extension circuit configured to force the first bus-width control signal to a predetermined level when the bus controller is applied to a bus with a second bus controller that is incompatible with the first bus-width. Advantages of the invention include controlling a number of data bits to be transferred between a PCI device and a data bus that does not violate PCI specifications. Other advantages include a programmability of the PCI device to adapt to legacy systems as PCI technology progresses.

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