Invention Grant
- Patent Title: Reset extender for divided clock domains
- Patent Title (中): 为分时钟域复位扩展器
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Application No.: US13744004Application Date: 2013-01-17
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Publication No.: US08786332B1Publication Date: 2014-07-22
- Inventor: Erik P. Machnicki , David S. Warren , Shane J. Keil , Sukalpa Biswas
- Applicant: Apple Inc.
- Applicant Address: US CA Cupertino
- Assignee: Apple Inc.
- Current Assignee: Apple Inc.
- Current Assignee Address: US CA Cupertino
- Agency: Meyertons, Hood, Kivlin, Kowert & Goetzel, P.C.
- Main IPC: H03L7/00
- IPC: H03L7/00 ; G06F1/24

Abstract:
A clock divider may provide a lower speed clock to a logic block portion, but during reset, the clock divider may not operate properly, causing the logic block portion to be reset at a clock frequency greater than the frequency for which that logic was designed. However, an extended reset may be employed in which the clock divider is reset normally first before the logic block portion, allowing that logic to be reset according to the divided clock (e.g., rather than a higher speed clock). An asynchronous reset may also be employed in which one or more clock dividers first emerge from reset before being provided with a (synchronized) high speed clock signal, causing the clock dividers to be in phase with each other. This may enable communication between different areas of an IC that might not otherwise be in proper phase with each other.
Public/Granted literature
- US20140197870A1 RESET EXTENDER FOR DIVIDED CLOCK DOMAINS Public/Granted day:2014-07-17
Information query