CAM Block Power Limiting via Governor Logic
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Solution Overview
Problem
Content addressable memory (CAM) devices face challenges in managing power consumption, which increases with storage density and data throughput, leading to thermal constraints and the need for a single device to meet various power consumption limits specified by different network customers.
Innovation Solution
A content search system with a CAM device incorporating governor logic that configures power consumption by selectively enabling or disabling CAM blocks based on a specified power limit, using a configuration memory to determine the maximum number of blocks that can be searched without exceeding the limit, ensuring compliance with customer-defined power constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If storage density and data throughput are increased, then performance is improved, but power consumption and heat generation increase
Solution Approach 1:
The CAM device is divided into multiple CAM blocks that can be independently enabled or disabled. The governor logic selectively activates only the necessary number of blocks based on power consumption limits, allowing the system to maintain high throughput when needed while reducing power consumption during normal operation.
Solution Approach 2:
The system dynamically adjusts the number of active CAM blocks based on real-time power consumption monitoring and limits. The governor logic continuously adapts the operational configuration of CAM blocks to meet power constraints while maintaining optimal performance for the given workload.
2Reliability
If the number of CAM blocks searched is increased, then search completeness is improved, but power consumption increases
Solution Approach 1:
Instead of always activating all CAM blocks, the system activates only the necessary number of blocks to achieve the required search completeness. The governor logic determines the minimum number of blocks needed based on power limits and workload, avoiding unnecessary power consumption from over-activating blocks.
3Adaptability or versatility
If a single CAM device is designed to meet various power consumption limits, then adaptability is improved, but device complexity increases
Solution Approach 1:
The CAM device is designed with universal adaptability through the governor logic that can configure different numbers of CAM blocks based on varying power consumption limits. A single device architecture serves multiple power constraint scenarios without requiring custom hardware designs for each application.
Solution Approach 2:
The system changes operational parameters by dynamically adjusting the number of active CAM blocks based on power limits. This parameter-based configuration allows the same hardware to comply with different power consumption requirements without physical modification, simplifying device design while maintaining versatility.
Data Source
AI summary
A content search system including a CAM device having a plurality of CAM blocks and a governor logic receives a search request and compares the number of CAM blocks required to perform the requested search to a limit number, the limit number being the maximum number of CAM blocks permitted to be used in a requested search operation. If the number of CAM blocks required to perform the requested search exceeds the maximum number of CAM blocks permitted to be used in a requested search operation, then the search operation is rejected. The governing operation can be performed on each requested search, thus limiting power dissipation. The relationship between a maximum number of CAM blocks and power dissipation can be characterized, and a corresponding block limit value can be stored into a memory accessible by governor logic.