Clock Gating Circuit Using CPM for Voltage Drop Response
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Solution Overview
Problem
As semiconductor devices increase in integration and complexity, voltage drops lead to increased power consumption, which can cause temperature rises, slow operation, and potential damage or reduced lifetime, necessitating effective clock gating to manage power consumption.
Innovation Solution
A semiconductor device with a critical path monitor (CPM) and clock gating circuit that dynamically adjusts clock signals based on power voltage fluctuations, using a digital code comparison to suspend clock signals during voltage drops, thereby reducing power consumption and preventing malfunctions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If clock gating is performed to reduce power consumption, then power consumption decreases, but response time to voltage drops increases
Solution Approach 1:
The CPM continuously monitors the critical path operation speed in advance and generates an enable signal before voltage drops cause malfunctions. This preliminary monitoring and early signal generation allow the clock gating circuit to respond quickly when voltage drops occur, resolving the contradiction between reducing power consumption through clock gating and maintaining fast response time to voltage drops.
2Speed
If operation speed increases, then processing capability improves, but power consumption increases
Solution Approach 1:
The clock gating circuit dynamically adjusts the clock signal based on real-time voltage conditions monitored by the CPM. When voltage drops are detected, the clock signal is suspended to reduce power consumption; when voltage is stable, full operation speed is maintained. This dynamic adjustment resolves the contradiction between maintaining high operation speed and reducing power consumption.
Solution Approach 2:
The system changes the clock frequency parameter dynamically based on voltage conditions. The CPM monitors voltage stability and controls the clock gating circuit to adjust the clock frequency, thereby changing the operation speed parameter to balance performance and power consumption according to real-time electrical conditions.
3Adaptability or versatility
If integration degree increases, then functionality improves, but power consumption increases
Solution Approach 1:
The semiconductor device is segmented into functional blocks with a dedicated CPM monitoring the critical path and a clock gating circuit controlling clock distribution. This segmentation allows selective clock gating in specific regions based on local voltage conditions, enabling high integration度 with reduced overall power consumption by only suspending clocks where voltage drops are detected.
Data Source
AI summary
A semiconductor device includes an intellectual property (IP) block configured to operate based on a first clock signal and a power voltage, a clock gating circuit configured to operate based on the power voltage, and generate the first clock signal by selectively performing clock gating on a second clock signal based on an enable signal, and a critical path monitor (CPM) configured to generate a digital code having a value, which varies according to a voltage drop of the power voltage, and activate the enable signal based on a comparison of the value of the digital code with a reference value.