Dual-Ended Memory Clock Driver Layout for Contamination Delay
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Solution Overview
Problem
Memory devices with a single memory clock driver experience contamination delay, leading to timing issues and errors in high-speed applications due to the propagation delay of the memory clock signal across the word line, affecting the activation of memory cells.
Innovation Solution
Implementing a second memory clock driver at the opposite end of the memory clock line from the first driver to eliminate contamination delay by ensuring simultaneous activation of both ends of the word line, reducing propagation delay and enhancing signal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single memory clock driver is used to activate memory rows, then the device complexity is reduced, but propagation delay causes timing contamination and errors in high-speed applications
Solution Approach 1:
The memory array is divided into two segments, each served by a separate memory clock driver positioned at opposite ends. This segmentation allows simultaneous clock signal distribution to different row groups, eliminating the propagation delay contamination that occurs with a single driver while maintaining manageable device complexity through modular architecture.
2Device complexity
If a single memory clock driver is used, then the device structure is simpler, but contamination delay increases leading to timing errors
Solution Approach 1:
The memory clock driver at each end preliminarily activates its corresponding group of rows simultaneously, rather than sequentially propagating from one end. This preliminary simultaneous action eliminates contamination delay by ensuring all rows receive clock signals at the same time, preventing timing errors in high-speed memory operations.
3Device complexity
If memory clock signal propagates across the word line from a single driver, then the device configuration is simpler, but timing issues and errors occur in high-speed applications
Solution Approach 1:
The clock signal distribution transitions from a one-dimensional propagation path (single driver at one end) to a two-dimensional simultaneous distribution pattern (drivers at both ends). This dimensional change allows clock signals to reach all rows simultaneously from opposite directions, eliminating propagation delay limitations and enabling higher memory operation speeds.
Data Source
AI summary
Memory clock drivers, memories, and methods of operating memory clock drivers are provided. A memory device contains two memory clock drivers disposed opposite each other across an array of rows of memory cells. The memory clock drivers contain decoders, which decode an address corresponding to one or more rows of memory cells. The decoders are configured to decode the address to provide a plurality of word line signals to the corresponding rows of memory cells. The memory device also includes a row select circuit, which receives a row select address and activates a corresponding row of memory cells. The memory device includes control circuitry to control the arrays of memory cells at a local and a global level, as well as I/O modules to send signals to different parts of the memory device and integrate the memory device into external devices.