Method for caching data and generating only one read request to

Details Method for caching data and generating only one read request to Method for caching data and generating only one read request to

1997-07-10

1999-11-16

Lee, Thomas C.

Electrical computers and digital data processing systems: input/

Input/output data processing

Input/output addressing

710 20, 710 52, 711118, G06F 1314

Patent

active

059875305

ABSTRACT:
An apparatus and method is provided for caching data in a universal serial bus (USB) system. In one embodiment, the present invention employs a host computer coupled to an I/O device via a USB. The host computer includes a data cache for storing data retrieved from the I/O device. The data cache allows data to be returned to the host computer upon request without accessing the I/O device via a USB transaction. A cacheability look-up table and cache table are provided to ensure the integrity of data returned to the host computer. Requested data is returned from the I/O device if the cacheability look-up table indicates the requested data is noncacheable. Data is returned from the data cache if the cache table indicates the requested data is available in the cache as valid data. If the cache table indicates the requested data is not available in the cache as valid data, the requested data is returned from the I/O device along with data stored in predetermined I/O device addresses. The additional data is stored in the cache for subsequent access by the host computer. By returning data from the cache, the present invention reduces the response time and reduces the traffic over the USB between the host computer and I/O device.

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