Transceiver Alignment Detector Circuit for RCCS Deskew
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Solution Overview
Problem
In high-speed multi-channel systems, receiver channel-to-channel skew (RCCS) adversely affects performance by causing timing differences between signal transitions, which is not effectively addressed by existing transceiver circuitry.
Innovation Solution
The implementation of transceiver circuitry with a storage element, alignment detector circuit, and registers that detect predefined patterns in input streams to generate asserted ready signals, allowing deskew and phase compensation FIFOs to align signals across bonded channels, ensuring synchronized data transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple transceiver channels are bonded together in a high-speed multi-channel system, then data rate and communication capability are improved, but receiver channel-to-channel skew (RCCS) adversely affects system performance
Solution Approach 1:
The alignment detector circuit detects predefined patterns (such as comma sequences in LVDS protocols) in advance to determine the relative timing offsets between channels. This preliminary detection allows the system to establish alignment information before data transfer begins, enabling subsequent synchronization of multiple bonded channels to compensate for RCCS and ensure reliable high-speed communication
2Adaptability or versatility
If receiver channel-to-channel skew (RCCS) is present in bonded channels, then channel bonding is achievable, but timing differences between signal transitions degrade performance
Solution Approach 1:
The alignment detector circuit continuously monitors the received signals on each bonded channel and detects predefined patterns to measure timing offsets. This feedback information about relative channel delays is used to dynamically adjust the timing of individual channels, ensuring that all channels are properly synchronized despite manufacturing variations and RCCS, thereby maintaining both channel bonding capability and timing precision
Data Source
AI summary
Transceiver circuitry may include a storage element that receives data signals from an external element, an alignment detector circuit, and a register. The storage element has a write clock terminal that receives a channel clock signal and a read clock terminal that receives another channel clock signal. The alignment detector circuit is adapted to generate an asserted ready signal when a predefined pattern is detected in the received data signals. The register receives an output signal from the storage element and outputs the output signal based on the asserted ready signal that is generated by the alignment detector circuit. The register may be clocked by the same channel clock signal that is received at the read clock terminal of the storage element.