- 专利标题: Test and characterization of an embedded PLL in an SOC during startup
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申请号: US15987257申请日: 2018-05-23
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公开(公告)号: US10686450B2公开(公告)日: 2020-06-16
- 发明人: Anthony E. Grass
- 申请人: GLOBALFOUNDRIES INC.
- 申请人地址: KY Grand Cayman
- 专利权人: GLOBALFOUNDRIES INC.
- 当前专利权人: GLOBALFOUNDRIES INC.
- 当前专利权人地址: KY Grand Cayman
- 代理机构: Gibbs & Riley, LLC
- 代理商 Anthony J. Canale
- 主分类号: H03L7/081
- IPC分类号: H03L7/081 ; H03L7/093 ; G01R31/317
摘要:
Different delay counts are supplied to a counter to perform multiple frequency captures on the output of a phase-locked loop (PLL) device. A PLL frequency set signal is supplied to the counter for each of the multiple captures performed on the PLL device. The set signal causes the PLL device to transition from a relatively lower frequency state to a relatively higher target (lock) frequency state. A different time delay count is begun each time the set signal is detected at an input of the counter, and a trigger signal is output from the counter each time each of the different delay counts is complete. A frequency detector captures the frequency being output by the PLL device each time the trigger signal is received. Such forms a record of the frequency being output by the PLL device for each different time delay count.
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