Invention Grant
US09564898B2 Power switch ramp rate control using selectable daisy-chained connection of enable to power switches or daisy-chained flops providing enables
有权
电源开关斜坡率控制使用可选的菊花链连接启用电源开关或菊花链触发器提供启用
- Patent Title: Power switch ramp rate control using selectable daisy-chained connection of enable to power switches or daisy-chained flops providing enables
- Patent Title (中): 电源开关斜坡率控制使用可选的菊花链连接启用电源开关或菊花链触发器提供启用
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Application No.: US14622111Application Date: 2015-02-13
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Publication No.: US09564898B2Publication Date: 2017-02-07
- Inventor: Shingo Suzuki , Harsha Krishnamurthy , Edvin Catovic , Rajat Goel , Manoj Gopalan
- 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.
- Agent Lawrence J. Merkel
- Main IPC: H03K19/003
- IPC: H03K19/003 ; H03K19/00

Abstract:
In an embodiment, an integrated circuit may include one or more power gated blocks and a power manager circuit. The power manager circuit may be configured to generate a block enable for each power gated block and a block enable clock. The power gated block may generate local block enables to various power switch segments in the power gated block. In particular, the power gated block may include a set of series-connected flops that receive the block enable from the power manager circuit. The power gated block may include a set of multiplexors (muxes) that provide the local block enables for each power switch segment. One input of the muxes is coupled to the block enable, and the other input is coupled to another enable propagated through one of the other power switch segments. Accordingly, the muxes may be controlled to select the propagated enables or the input block enable.
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