System and method for USB controllers
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United States of America Patent
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-
Apr 25, 2006
Grant Date -
N/A
app pub date -
Mar 18, 2002
filing date -
Mar 19, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A USB controller is provided with multiple logic channels that share same physical address and data bus at an interface between the host system and the USB Host Controller; and dataports used by the host system to read and/or write data to the USB Host Controller. Also provided is a data packet format for transferring data, which comprises of an Endpoint Transfer Descriptor ('ETD') that includes an EndPoint Descriptor and a Transfer Descriptor, wherein the host system programs the parameters of a communication channel for a particular Endpoint. Also included is a technique for partitioning a memory storage device into a first memory buffer and a second memory buffer; wherein the size of the first and second memory buffer may be programmed by the host system and the first and/or second memory buffer may contain more than one USB packet.
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