Apparatus and method for handling universal serial bus control transfers
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United States of America Patent
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Mar 20, 2001
Grant Date -
N/A
app pub date -
Jan 7, 1998
filing date -
Jan 7, 1998
priority date (Note) -
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Abstract
A method and apparatus for performing a control transfer on a Universal Serial Bus (USB) device. A USB device includes a memory space for reading and writing data transmitted over a USB network. The memory space is shared between a plurality of endpoints. A host initiates a control transfer by transmitting a SETUP token to a first endpoint. The endpoint must accept the SETUP token. If the first endpoint does not expect the SETUP token, or if another endpoint is active, the device stores the token until a buffer is allocated and the first endpoint is made active.
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