Serial Transceiver Delay Synchronization for Loop Back Testing
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Solution Overview
Problem
In serial transceivers, the variable delay times during loop back tests lead to misjudgment and increased production costs due to the need for complex external circuit checks, which are prone to errors.
Innovation Solution
A serial transceiver with a controlling module that generates a delay time signal based on target, transmitting, and receiving time signals to synchronize package delivery to the data link layer, reducing external circuit influence and ensuring accurate testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If packages are transmitted through external circuits during loop back test, then the serial transceiver can perform testing, but the variable delay times cause misjudgment and reduced test accuracy
Solution Approach 1:
The patent applies preliminary action by introducing a delay adjustment module that pre-calculates and applies compensation for external circuit delay times before the loop back test is performed. This ensures that packages are delayed by a fixed, predetermined amount to compensate for the variable delays introduced by external circuits, thereby achieving consistent and accurate test results without requiring complex real-time adjustments during testing.
2Reliability
If complex external circuit checks are used to verify package transmission, then the serial transceiver can detect transmission status, but the checking mechanism becomes more complex and prone to errors
Solution Approach 1:
The patent extracts the delay compensation function from the complex external circuit checking mechanism and implements it through a dedicated delay adjustment module. This module independently calculates and applies the necessary delays based on predetermined external circuit characteristics, separating the compensation function from the detection function and simplifying the overall system while improving reliability.
3Productivity
If packages are transmitted at different times through multiple channels, then the serial transceiver can handle multiple data streams, but the variable delay times make it difficult to ensure simultaneous arrival at the data link layer
Solution Approach 1:
The patent applies local quality by implementing channel-specific delay adjustment for each transmission channel. Each channel has its own delay adjustment mechanism that tailors the delay compensation to that specific channel's external circuit characteristics. This allows multiple channels to transmit packages simultaneously while ensuring that each channel's packages arrive at the data link layer at the correct synchronized time, maintaining both high productivity and arrival synchronization.
Data Source
AI summary
A serial transceiver transmits at least one package of a data link layer and includes at least one channel including at least one transmitting module and at least one receiving module, a generating module and a controlling module. The channel is for transmitting the corresponding package. The transmitting module transmits the corresponding package and generates a transmitting time signal. The receiving module receives the package transmitted from the corresponding transmitting module and generates a receiving time signal. The generating module generates a target delay time signal. The controlling module receives the target delay time signal, transmitting time signals and receiving time signals, and generates a delay time signal for the corresponding receiving module according to the target delay time signal, the transmitting time signal and the receiving time signal. The receiving module receives the corresponding delay time signal and delays the transmission of the package according to the delay time signal such that the data link layer receives each package at the same time.