USB host protocol

Details USB host protocol USB host protocol

2004-05-19

2009-02-17

Flynn, Nathan J (Department: 2443)

Electrical computers and digital processing systems: multicomput

Computer-to-computer protocol implementing

Computer-to-computer data transfer regulating

C370S231000, C370S278000, C370S412000, C709S233000

Reexamination Certificate

active

07493408

ABSTRACT:
A method of transferring bulk and control data from a first device to a second device over a USB bus comprises storing transfer descriptors, each including a transfer descriptor header and payload data, in a buffer memory in the first device. The data is read in packets for transfer to the second device, with packets being read from the transfer descriptors cyclically. When the first and second transfer descriptor headers, in first and second transfer descriptors respectively, define a common endpoint, data packets are read from only the first transfer descriptor, until such time as it is detected that all data packets from the first transfer descriptor have been transmitted, and thereafter data packets are read from the second transfer descriptor.

REFERENCES:
patent: 7315515 (2008-01-01), Pazos
patent: 2004/0073697 (2004-04-01), Saito et al.

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