Electrical computers and digital data processing systems: input/ – Intrasystem connection – Protocol
Reexamination Certificate
2007-10-09
2007-10-09
Auve, Glenn A. (Department: 2111)
Electrical computers and digital data processing systems: input/
Intrasystem connection
Protocol
C710S110000
Reexamination Certificate
active
10929779
ABSTRACT:
Methods and systems for extending the functionality of an embedded Universal Serial Bus (USB) transceiver interface to handle threshold shift of a USB 2.0 bus during high-speed chirp are presented. A method for a transceiver of a host coupled by a USB 2.0 bus to a device includes receiving a control signal, and selecting one of a first and second zero level voltage threshold according to the control signal. The first threshold is higher than the second to compensate for a shift in a zero level of the bus during high-speed chirp. In one example, the transceiver selects the first threshold when driving a reset signal, and selects the second threshold after detecting a device high-speed chirp signal. In another example, the transceiver selects the second threshold after driving a high-speed chirp sequence. In one example, the control signal includes a signal of a host controller embedded USB transceiver interface.
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Lupienski John
Turner Tony
Auve Glenn A.
Broadcom Corporation
Sterne Kessler Goldstein & Fox PLLC
Vu Trisha
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