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Method and device for generating a local clock using universal serial bus (USB) downstream received signals DP and DM
Method and device for generating a local clock using universal serial bus (USB) downstream received signals DP and DM
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机译:使用通用串行总线(usb)下游接收信号dp和dm产生本地时钟的方法和装置
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摘要
A method and device is disclosed for generating a local clock signal CLK1X (172) from Universal Synchronous Bus downstream-received differential signals DM and DP carrying the downstream received bit-serial signal. The method and device does not require the use of a crystal or resonator. Counters (312, 310, 305, 301) are used to determine a number of periods of a free-running high frequency clock signal (164) contained within in a known number of bit periods of the downstream received bit-serial signal (146). The counter values are divided by the known number of bit periods of the received bit-serial signal (146) to determine a bit period of the received bit-serial signal (146). The local clock signal (172) may be phase-locked with the received bit serial signal (146). The local clock period is updated on an ongoing manner by downstream known received traffic.
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