Parallel-to-Serial Lane Synchronization for Skew Reduction
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Solution Overview
Problem
High-speed serial data transmission between multiple lanes experiences skew due to differences in wiring capacity and processing delay, leading to synchronization issues and potential data errors.
Innovation Solution
A parallel-to-serial conversion circuit with a synchronization signal interface between ½ divider circuits allows for synchronized clock signal generation and distribution, reducing skew by using a master/slave switching signal to adjust clock signal timings across lanes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If parallel-to-serial conversion circuits are provided for multiple lanes to improve transmission capacity and speed, then data transmission efficiency is improved, but skew occurs between output data of different lanes due to differences in wiring capacity and processing delay
Solution Approach 1:
The invention divides the clock signal distribution into separate segments for each lane, with each parallel-to-serial conversion circuit having its own clock signal input. This allows independent timing adjustment for each lane while maintaining overall synchronization, resolving the skew issue caused by shared clock distribution.
Solution Approach 2:
The invention changes the timing parameters of clock signals for different lanes to compensate for skew. By adjusting the phase and timing of clock signals individually for each lane, the output data from all lanes can be synchronized despite differences in wiring capacity and processing delay.
2Stability of the object's composition
If the same clock signal is used for synchronization across multiple lanes, then initial synchronization is achieved, but differences in wiring capacity and processing delay cause timing skew between lanes
Solution Approach 1:
The invention performs preliminary timing adjustment of clock signals for each lane before they reach the parallel-to-serial conversion circuits. By pre-compensating for expected delays in each lane's wiring and processing, the system achieves synchronized output without requiring complex real-time correction mechanisms.
3Manufacturing precision
If complex reset signal distribution circuits are used to synchronize lanes, then skew can be reduced, but device complexity increases
Solution Approach 1:
The invention extracts the timing adjustment function from complex reset signal distribution circuits and implements it directly within each parallel-to-serial conversion circuit through independent clock signal inputs. This simplifies the overall system architecture by eliminating the need for complex external synchronization circuits.
Data Source
AI summary
A parallel-to-serial conversion circuit includes a plurality of parallel-to-serial conversion units, each being configured to include a dividing circuit configured to divide a clock signal having a second clock cycle to generate a clock signal having a first clock cycle, a parallel input circuit configured to input a signal having a plurality of bits parallel to one another in the first clock cycle, and a serial output circuit configured to serially output the signal having the plurality of bits input to the parallel input circuit bit-by-bit in the second clock cycle, wherein, among the plurality of parallel-to-serial conversion units, one of the dividing circuits has a synchronization signal interface that causes an output clock signal to synchronize with a clock signal output from the other dividing circuit in another parallel-to-serial conversion unit.