Invention Grant
- Patent Title: Test and characterization of an embedded PLL in an SOC during startup
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Application No.: US15987257Application Date: 2018-05-23
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Publication No.: US10686450B2Publication Date: 2020-06-16
- Inventor: Anthony E. Grass
- Applicant: GLOBALFOUNDRIES INC.
- Applicant Address: KY Grand Cayman
- Assignee: GLOBALFOUNDRIES INC.
- Current Assignee: GLOBALFOUNDRIES INC.
- Current Assignee Address: KY Grand Cayman
- Agency: Gibbs & Riley, LLC
- Agent Anthony J. Canale
- Main IPC: H03L7/081
- IPC: H03L7/081 ; H03L7/093 ; G01R31/317

Abstract:
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.
Public/Granted literature
- US20190363719A1 TEST AND CHARACTERIZATION OF AN EMBEDDED PLL IN AN SOC DURING STARTUP Public/Granted day:2019-11-28
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