Differential Strobe Signal Tuning to Prevent DQS Reversal
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Solution Overview
Problem
In semiconductor systems, particularly in synchronous semiconductor systems, a skew between data and system clock signals occurs due to differences in loading and trace characteristics, which can lead to data transmission errors during write and read operations.
Innovation Solution
The semiconductor device adjusts the level and swing width of strobe signals, such as DQS and DQSB, using test signals TM<1:4> to synchronize data transmission with the system clock, ensuring that the strobe signals have the same loading and trace characteristics as the data, thereby minimizing potential differences and preventing signal reversal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data is outputted from chipset to memory using system clock signal, then synchronization is achieved, but skew occurs due to different loading and trace characteristics
Solution Approach 1:
The patent introduces a data strobe signal (DQS) as an intermediary between the system clock signal and the data signal. This DQS signal is generated from the data signal itself through sampling and delay circuits, allowing it to share the same loading and trace characteristics as the data. By using DQS as a mediator for strobing operations, the patent eliminates skew between clock and data signals while maintaining reliable data transmission.
2Manufacturing precision
If data strobe signal DQS is used for strobing, then skew is minimized, but potential difference reversal occurs between differential strobe signals
Solution Approach 1:
The patent implements dynamic level adjustment of the data strobe signal DQS based on the actual data signal characteristics. By continuously adapting the DQS signal level to match the data signal's loading and trace conditions, the system maintains accurate timing synchronization while preventing potential difference reversal between differential strobe signals during strobing operations.
Data Source
AI summary
A semiconductor device may be provided. The semiconductor device may be configured to adjust a level of a first strobe signal to a predetermined level during a first time period. The semiconductor device may be configured to adjust a swing width of the first strobe signal during a second time period.