Nibble De-Skew Clock Phase Control for High-Speed Memory I/O
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Solution Overview
Problem
Input/output (I/O) circuits in memory devices face challenges in supporting the increasing speeds of memory devices due to phase skew between data signals and clock signals, which existing methods struggle to manage effectively.
Innovation Solution
The implementation of nibble de-skew control circuits and delay line and interpolator circuits to determine appropriate clock phases for I/O nibble interface circuits, allowing for de-skew correction on a nibble-by-nibble basis, thereby minimizing skew and enhancing performance while balancing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If de-skewing is performed on a nibble-by-nibble basis using control circuits and delay lines, then timing precision and performance are improved, but device complexity and power consumption increase
Solution Approach 1:
The patent divides the de-skewing operation into nibble-level segments rather than treating all bits uniformly. Each nibble (4 bits) has its own de-skew control circuit and delay line, allowing independent timing adjustment. This segmentation provides finer timing control precision while keeping each individual nibble's control logic manageable, resolving the contradiction between precision and complexity.
Solution Approach 2:
The patent applies different de-skewing parameters and control mechanisms to different nibbles based on their specific timing characteristics. Each nibble can have customized delay values and control circuit configurations tailored to its particular skew conditions, rather than applying a uniform de-skewing approach to all data bits.
2Measurement precision
If de-skewing is performed on a nibble-by-nibble basis using control circuits and delay lines, then timing precision and performance are improved, but power consumption increases
Solution Approach 1:
The patent implements de-skewing for only 4 bits (one nibble) at a time rather than all data bits simultaneously. This partial action approach achieves sufficient timing precision for the critical nibble while avoiding the excessive power consumption that would result from full-width de-skewing circuits operating at maximum capacity.
3Device complexity
If traditional de-skewing methods are used, then device complexity is reduced, but timing precision and performance suffer at higher speeds
Solution Approach 1:
By segmenting the data bus into nibbles and providing dedicated de-skew control for each, the patent achieves high timing precision necessary for fast memory operations without requiring overly complex global de-skewing circuits. The segmented approach scales better with speed increases.
Solution Approach 2:
The patent employs dynamic delay adjustment where the delay line and control circuits can adaptively modify timing parameters based on detected skew conditions. This dynamic capability allows the system to maintain optimal timing precision across varying operating conditions and speeds without requiring excessive static complexity.
Data Source
AI summary
De-skew is performed on a nibble-by-nibble basis where a nibble is not limited to four bits.