Network Device Alignment Logic for High-Speed Data Stream Synchronization
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Solution Overview
Problem
High-speed network adapters face challenges in efficiently detecting bit patterns due to the unpredictable occurrence of alignment markers after deserialization, which hinders quick data processing and alignment lock acquisition.
Innovation Solution
The alignment logic implements a wide bus comparison within a single clock cycle to identify the starting bit position of the alignment marker by using a plurality of comparators to match against known portions of the alignment marker, allowing for efficient data reordering and processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional sequential comparison methods are used to detect alignment markers, then the detection process is simple to implement, but the detection speed is too slow for high-speed network interfaces operating at 64G or higher
Solution Approach 1:
The patent segments the alignment marker detection task by dividing the parallel data stream into multiple portions and using multiple comparators to compare different portions simultaneously. This segmentation enables parallel processing of the detection task, achieving single-clock-cycle detection speed while managing complexity through structured organization of comparison operations.
Solution Approach 2:
The patent transitions from sequential single-bit comparison to parallel multi-bit comparison by utilizing a wide bus architecture. Multiple comparators operate simultaneously on different portions of the parallel data stream, effectively adding a temporal dimension to the detection process and achieving high-speed detection compliant with 64G and higher network interface speeds.
2Loss of time
If the alignment marker detection is performed sequentially bit by bit, then the logic implementation is straightforward, but the time to acquire alignment lock is excessive and hinders quick data processing
Solution Approach 1:
The patent performs preliminary parallel comparison of multiple data portions simultaneously against known alignment marker patterns. By preparing and executing all necessary comparisons in advance within a single clock cycle, the system eliminates sequential delays and achieves rapid alignment lock acquisition, enabling immediate data processing without time loss.
3Speed
If high-speed parallel comparison is implemented to meet 64G network interface requirements, then the detection speed is sufficient, but the hardware complexity and resource requirements increase significantly
Solution Approach 1:
The patent applies local quality by having different comparators specialize in comparing specific portions of the parallel data stream. Each comparator is optimized for its local comparison task, and the results are combined to determine the complete alignment marker match. This localized approach achieves high-speed detection while managing overall system complexity through functional specialization.
Data Source
AI summary
Methods and systems for network devices are provided. One method includes receiving a serial data stream at a network interface of a network device coupled to a network link to communicate with other networked devices, the data stream including an alignment marker with a bit pattern for recovering a bit stream used by network device logic for processing the received serial data stream; using a plurality of comparators for simultaneously comparing within a single clock cycle, portions of a parallel data stream generated after converting the serial data stream by a de-serializer of the network device; detecting the bit pattern of the alignment marker in the parallel data stream by one of the plurality of comparators; storing a starting bit position of the alignment marker in the parallel data stream; and reordering the parallel data stream based on the stored starting bit position of the alignment marker.