发明名称 |
METHOD AND CIRCUIT FOR TRIMMING AN INTERNAL OSCILLATOR OF A USB DEVICE |
摘要 |
A circuit and method for trimming an internal oscillator of a USB device that generates a clock signal as a frequency source of the USB device detect an end of packet from an input data stream to initialize a counter, identify a token packet in the data stream to detect a start of frame token packet for the counter to carry out clock counting on the clock signal to thereby obtain a count value, and compare the count value with a reference value to determine a trimming code for trimming a clock frequency of the internal oscillator.
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申请公布号 |
US2011093736(A1) |
申请公布日期 |
2011.04.21 |
申请号 |
US20100889794 |
申请日期 |
2010.09.24 |
申请人 |
ELAN MICROELECTRONICS CORPORATION |
发明人 |
CHIANG TSUNG-YIN;WANG CHUN-CHI;WU PO-HAO;TANG CHUN-AN |
分类号 |
G06F1/04 |
主分类号 |
G06F1/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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