Patent ID: 8176227
Filing Date: 2012-05-08
Classification: G06F

Abstract:
1. A method for high-speed detection handshake between a first transceiver and a second transceiver connected with a USB bus, the USB bus comprising a first data line (DP) and a second data line (DM), the method comprising: asserting a reset signaling at the USB bus that drives the first and second data lines to a first voltage level for a predefined time interval at the first transceiver; activating a dual-mode squelch detector in each of the first transceiver and the second transceiver in a first mode of operation, wherein the dual-mode squelch detectors in the first mode of operation generate a squelch signal based on a differential signal received from the USB bus, wherein the squelch signal is in a first predefined state when the differential signal is below a first threshold voltage level and in a second predefined state when the differential signal exceeds a second threshold voltage level; initiating a chirp signaling between the first transceiver and the second transceiver; enabling a high-speed communication mode in the first and the second transceivers based on successful completion of the chirp signaling; and activating the dual-mode squelch detectors in each of the first and second transceivers in a second mode of operation, wherein the dual-mode squelch detectors in the second mode of operation generate a squelch signal based on the differential signal received from the USB bus, wherein the squelch signal is in the first predefined state when the differential signal is below a third threshold voltage level, and in the second predefined state when the differential signal exceeds a fourth threshold voltage level.