Write Clock Pre-Leveling for Stable High-Speed Semiconductor I/O
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Solution Overview
Problem
The challenge of achieving high-speed data transfer in semiconductor systems is hindered by inter-symbol interference (ISI) due to channel reflections and distortions, which affect the stability of data input and output operations.
Innovation Solution
A semiconductor system that generates a write clock with a set level during a pre-level interval and periodically toggles during a toggle interval, based on channel characteristics, using a controller and semiconductor device configuration to stabilize data synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data transfer speed is increased to achieve high-speed communication, then productivity is improved, but inter-symbol interference increases due to channel reflections and distortions
Solution Approach 1:
The patent applies preliminary action by setting the write clock to a fixed level during a pre-level interval before the actual data transfer begins. This pre-positioning of the clock signal prepares the channel and reduces reflections that would otherwise occur during rapid toggling, thereby enabling high-speed data transfer while maintaining stability.
Solution Approach 2:
The patent segments the clock signal transmission into distinct intervals: a pre-level interval where the clock is held at a fixed level, and a toggle interval where the clock periodically switches. This segmentation allows the system to benefit from both stable clock levels (reducing interference) and active data transfer (maintaining high speed).
2Productivity
If the write clock toggles frequently to increase data throughput, then productivity is improved, but inter-symbol interference increases due to channel reflections
Solution Approach 1:
The patent applies preliminary anti-action by holding the write clock at a fixed level during the pre-level interval, which counteracts the tendency for reflections to occur when the clock suddenly starts toggling. This preliminary stabilization prevents the generation of harmful reflections before data transfer begins.
Data Source
AI summary
A semiconductor system includes a controller configured to output a command address, data, and a write clock and an inverted write clock for latching the data through a channel, configured to output the write clock and the inverted write clock having a first set level and a second set level, respectively, by incorporating information with regard to characteristics of the channel during a pre-level interval, and configured to output the write clock and the inverted write clock that periodically toggle during a toggle interval, and a semiconductor device configured to latch and store the data in synchronization with the write clock and the inverted write clock.