Invention Grant
- Patent Title: Multi-bit clock gating cell to reduce clock power
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Application No.: US15851134Application Date: 2017-12-21
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Publication No.: US10650112B1Publication Date: 2020-05-12
- Inventor: Harsha Krishnamurthy
- Applicant: Apple Inc.
- Applicant Address: US CA Cupertino
- Assignee: Apple Inc.
- Current Assignee: Apple Inc.
- Current Assignee Address: US CA Cupertino
- Agency: Kowert Hood Munyon Rankin and Goetzel PC
- Agent Rory D. Rankin
- Main IPC: G06F17/50
- IPC: G06F17/50 ; H03K3/037 ; H03K3/012 ; G06F1/10

Abstract:
Systems, apparatuses, and methods for efficiently implementing clock gating circuitry. A multi-bit clock gating cell is placed on the die of an integrated circuit and replaces at least two single-bit clock gating cells that were to be placed on the die. Each single-bit clock gating cell receives a single clock enable signal and generates a single gated clock signal. Each multi-bit clock gating cell receives multiple clock enable signals and generates multiple gated clock signals based on a single common received clock signal. Conditions for determining whether two or more single-bit clock gating cells are replaced by a multi-bit clock gating cell include a distance between two single-bit clock gating cells, a load driven by any one of the two single-bit clock gating cells and an activity level of a common single clock received by at least two single-bit clock gating cells is above a respective threshold.
Information query