N-way Wave Pipeline Architecture for Memory Data Transfer
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Solution Overview
Problem
Wave pipelines in memory devices face limitations due to the need for each stage to be ready for the next clock cycle, which restricts data rate and requires reducing the clock rate or increasing the data bus width, making it challenging to accommodate slower stages without compromising performance.
Innovation Solution
Implementing an N-way wave architecture where the clock signal and data signal are sent to one of the stages every Nth clock cycle, allowing the data rate of each stage to be reduced by N times, thus preventing slower stages from limiting the maximum transfer rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the clock rate is reduced or data bus width is increased to accommodate slower stages, then all stages can operate at the same clock rate, but the overall data transfer rate is limited by the slowest stage
Solution Approach 1:
The wave pipeline is divided into multiple independent ways (e.g., 2-way, 4-way segmentation), where each way can operate at different data rates. This segmentation allows faster stages to process multiple data items while slower stages process fewer items, preventing the slowest stage from bottlenecking the entire system.
Solution Approach 2:
The patent implements dynamic operation where each way in the wave pipeline can operate at its own optimal speed. The system dynamically assigns different numbers of clock cycles to each way based on its processing capability, allowing flexible adaptation to varying stage speeds without requiring uniform clock rates across all stages.
2Stability of the object's composition
If each stage must be ready for the next clock cycle, then proper timing synchronization is maintained, but the data rate is restricted to be equal to or faster than the clock rate
Solution Approach 1:
The patent employs periodic action by allowing stages to be ready periodically rather than continuously at every clock cycle. Stages can complete operations and be ready for data at specific intervals (e.g., every Nth clock cycle), which maintains timing synchronization while allowing higher overall data throughput through the pipeline.
3Productivity
If the data rate of each stage is reduced by N times in an N-way architecture, then slower stages no longer limit the maximum transfer rate, but the clock signal must be distributed to multiple ways
Solution Approach 1:
The clock signal distribution is segmented into multiple independent paths, one for each way in the wave pipeline. Each way receives its own clock signal independently, allowing simple replication of the clock distribution logic rather than complex coordinated distribution, thus managing complexity while enabling higher transfer rates.
Data Source
AI summary
A system might include a first writing device and a second writing device. The first writing device might write first data to an array of memory cells in response to a first clock cycle of a clock signal. The write of the first data exceeds one clock cycle of the clock signal. The second writing device is in parallel with the first writing device. The second writing device might write second data to the array of memory cells in response to a second clock cycle of the clock signal. The second clock cycle follows the first clock cycle and the write of the second data exceeds one clock cycle of the clock signal.