Clock Data Recovery Null Frame Signal Path Settling
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Solution Overview
Problem
As data transmission frequencies increase in computer systems, the precision of clock and data recovery (CDR) techniques becomes inadequate due to narrowing data eyes, leading to potential data integrity loss and inaccurate recovery, especially when clock and data signals originate from different sources.
Innovation Solution
Transmitting null frames prior to sync frames along a signal path to mitigate jitter effects, allowing the signal wire to settle and ensuring accurate alignment of data sampling with the data eyes, thereby improving CDR behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data transmission frequency is increased, then productivity is improved, but measurement precision of clock and data recovery deteriorates due to narrowing data eyes
Solution Approach 1:
The patent applies preliminary action by transmitting null frames before sync frames to allow the signal wire to settle and stabilize before actual data transmission begins. This preliminary null frame transmission period enables the receiving component to properly align its data sampling timing with the incoming data eyes, ensuring accurate recovery even at higher transmission frequencies where data eyes are narrower.
2Productivity
If data transmission frequency is increased, then productivity is improved, but reliability of data integrity deteriorates due to jitter effects
Solution Approach 1:
The patent uses preliminary action by inserting null frames before sync frames to create a settling period that allows jitter to stabilize before data transmission. This ensures that when data frames are transmitted, the receiving component can accurately sample the data within the data eyes without being affected by transient jitter, thereby maintaining data integrity at higher transmission frequencies.
Solution Approach 2:
The patent implements feedback through the transmission of sync frames that provide timing information to the receiving component. The receiving component uses this feedback to adjust and maintain accurate data sampling timing, ensuring reliable data recovery even in the presence of jitter at high transmission frequencies.
3Adaptability or versatility
If clock and data signals originate from different sources, then adaptability is improved, but measurement precision of data recovery deteriorates
Solution Approach 1:
The patent applies preliminary action by transmitting null frames before sync frames to allow the signal wire to settle and stabilize. This creates a controlled transition period that enables the receiving component to synchronize its data sampling timing with the incoming data signal, even when the clock and data signals originate from different sources, thereby maintaining precise data recovery while preserving source flexibility.
Data Source
AI summary
Improved clock and data recovery involves transmitting one or more null frames prior to transmitting a sync frame. A receiving component detects for the sync frame to lock to a data signal sent on a signal path by a transmitting component. The one or more null frames transmitted prior to the sync frame results in a settling of the signal path prior to reception of the sync frame, thereby lessening or removing the effects of previously sent data on the sync frame.