Memory IO Timing Regulation via Programmable VCO Control
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Solution Overview
Problem
Current digital memory systems face challenges in achieving precise timing control while minimizing power consumption and tolerating design process variations, leading to excessive power usage in faster process corners.
Innovation Solution
Implementing a memory clocking scheme that uses independently controlled voltage-controlled oscillators (VCOs) and programmable oscillators, allowing each memory device to be adjusted to a target bitrate through feedback, enabling precise timing control and power optimization by tuning voltage and frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional overdesign of logic gates is used to ensure timing specification, then reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic timing adjustment by allowing memory devices to operate at different clock rates based on their actual performance characteristics. Instead of static overdesign, the system dynamically adapts the operating frequency to match each device's capabilities, ensuring timing specifications are met while avoiding excessive power consumption from uniform overdesign across all devices.
Solution Approach 2:
The patent changes the operating parameter (clock rate) of memory devices based on their individual performance. By measuring actual timing characteristics and adjusting the clock frequency accordingly, the system achieves reliable operation at optimized power levels rather than using fixed overdesign parameters for all devices.
2Manufacturing precision
If phase-locked loop circuitry is used to achieve exact timing alignment, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent employs feedback mechanisms where the memory controller measures the actual timing performance of memory devices and adjusts operating parameters accordingly. This feedback-based approach replaces complex phase-locked loop circuitry with a simpler system that achieves precise timing alignment through measurement and adjustment rather than complex hardware synchronization.
3Reliability
If sophisticated circuitry is employed to achieve timing control, then reliability is improved, but power consumption increases
Solution Approach 1:
The patent enables memory devices to self-adjust their operating frequency based on their inherent performance characteristics. Each device operates at its natural optimal frequency without requiring sophisticated external control circuitry, thereby achieving reliable timing control with minimal power consumption from control mechanisms.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach simplifies memory device design, reduces power consumption, and allows for the seamless utilization of devices across various process corners, achieving precise timing and minimizing average power usage.
Implementation Method 1
Implementing a memory clocking scheme that uses independently controlled voltage-controlled oscillators (VCOs) and programmable oscillators
Data Source
AI summary
This disclosure provides for adjustment of memory IO timing using a voltage controlled oscillator (VCO) and a register that generates a VCO control voltage directly used to vary memory IO timing. The register may be externally programmable by a controller and may be located on a memory device (IC, module or other device) or on an external voltage generator, which then provides an adjustable voltage to the memory device. This structure may be used to adjust memory timing so as to achieve a minimum target bitrate and thus minimize frequency of operation to minimize power. In one embodiment, each of several memory devices may be independently adjusted in this way to achieve a mesochronous memory system; in another embodiment, memory devices may be have their timing adjusted in parallel, with all memory devices equal to or greater than a target bitrate. Teachings presented herein provide a way to relax overdesign requirements and “tune” fast-fast and slow-slow devices to effectively operate as typical devices.