Command Pin Data Sampling Clock Transmission
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Solution Overview
Problem
Existing data transceiving systems face issues with phase skew and bandwidth limitations due to shared common clock signals, particularly at high speeds, and require additional clock pins in source clock schemes.
Innovation Solution
A data transceiving system where the data sampling clock signal is transmitted via the command pin, eliminating the need for an extra clock pin by integrating the clock function within the command signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a common clock signal is shared between data transmitting and receiving apparatus, then synchronization is achieved, but phase skew increases due to transmission path latency especially at high speeds
Solution Approach 1:
The patent introduces a data sampling clock signal as an intermediary that mediates between the transmitting and receiving apparatus. This clock signal is generated by the transmitting apparatus and transmitted to the receiving apparatus, where it serves as the reference for sampling data. This intermediary clock signal eliminates the phase skew problem caused by sharing a common clock signal over long transmission paths, as each apparatus generates its own clock locally based on the transmitted clock reference.
2Measurement precision
If a source clock scheme is used where the data transmitting apparatus generates the data sampling clock signal, then phase skew is reduced, but an extra clock pin is required
Solution Approach 1:
The patent makes the command pin multi-functional by having it serve both command signal transmission and data sampling clock signal transmission. The command pin, which already exists for control purposes, is now also used to carry the data sampling clock signal from the transmitting apparatus to the receiving apparatus. This eliminates the need for a separate dedicated clock pin, reducing device complexity while maintaining the benefits of the source clock scheme.
3Measurement precision
If command and data signals are transmitted separately with strict synchronization, then data accuracy is maintained, but transmission efficiency decreases due to synchronization overhead
Solution Approach 1:
The patent merges the clock signal transmission with the existing command signal transmission by using the same command pin for both purposes. The data sampling clock signal is transmitted during the same time period when command signals are being exchanged, eliminating the need for separate synchronization overhead. This combining of functions maintains data sampling accuracy while improving transmission efficiency by reducing the total number of separate signal transmissions required.
Data Source
AI summary
A data transceiving system, comprising: a data receiving apparatus, comprising a data receiving side command pin and at least one data receiving side data pin; a data transmitting apparatus, comprising a data transmitting side command pin and at least one data transmitting side data pin. The data receiving apparatus transmits a first command signal from the data receiving side command pin to the data transmitting side command pin, and the data transmitting apparatus transmits a first response signal from the data transmitting side command pin to the data receiving side command pin. The data transmitting apparatus transmits data from the data transmitting side data pin to the data receiving side data pin. The data transmitting apparatus transmits a first data sampling clock signal from the data transmitting side command pin to the data receiving side command pin, to sample the data.