Bitline Precharge Circuitry for Low-Power Memory Banks
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Solution Overview
Problem
Conventional memory cell architectures suffer from excessive static and dynamic power consumption due to bitline leakage and precharging, particularly in high-performance Systems-on-Chip (SoC), which is exacerbated by technology scaling.
Innovation Solution
Implementing a novel bitline precharge scheme that selectively precharges bitlines during active modes, uses flexible and non-flexible bitlines, and adjusts precharge signal width with an extra margin adjustment, preventing precharge during standby modes to reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If bitlines are precharged in traditional memory cell architecture, then data access is enabled, but static and dynamic power consumption increases significantly
Solution Approach 1:
The patent applies local quality by differentiating between accessed and unaccessed banks, applying precharge operations only where needed (accessed banks) rather than uniformly across all banks. This selective approach reduces unnecessary power consumption in unaccessed banks while maintaining data access capability in accessed banks.
Solution Approach 2:
The patent implements dynamic precharge control where the precharge operation is conditionally applied based on bank access status. The system dynamically adjusts precharge behavior - enabling it for accessed banks and disabling it for unaccessed banks - rather than using a static precharge-all approach, thereby reducing overall power consumption.
2Speed
If technology scaling is advanced to increase performance, then processing speed improves, but leakage power consumption becomes comparable to dynamic power consumption
Solution Approach 1:
The patent segments the memory system into multiple independently controllable banks. This segmentation allows selective precharge operations on individual banks based on access patterns, preventing unnecessary leakage power consumption in unaccessed banks while maintaining high-speed access capability in accessed banks. The segmentation enables fine-grained power control that scales efficiently with technology advancement.
3Area of stationary object
If lengthy routed bitlines are used to connect bitcells, then memory array coverage increases, but capacitive load and dynamic power consumption increase
Solution Approach 1:
The patent divides the memory array into multiple banks with localized bitline precharge control. This segmentation reduces the effective capacitive load that must be charged during precharge operations compared to a monolithic array, as precharge is applied only to accessed bank regions rather than the entire array. This enables better coverage while reducing dynamic power consumption proportional to the actual accessed area.
Data Source
AI summary
Various implementations described herein are directed to a device having memory circuitry with bitlines coupled to an array of bitcells. The device may include precharge circuitry that precharges the bitlines during modes of operation including a standby mode of operation and an active mode of operation. In some instances, the precharge circuitry may include a low power mode of operation that prevents precharge of the bitlines during the standby mode of operation.