Data Link Transmitter Clock Phase Calibration for Low-Power Sync
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Solution Overview
Problem
High-performance computing applications require significant power consumption for die-to-die data communication, which is inefficient and consumes a substantial portion of the total power in AI tools, and existing technologies do not effectively address this issue.
Innovation Solution
Implement clock-forwarded data link signaling with source-side clock calibration to minimize power consumption by shutting off the clock when the link is idle, and employ phase calibration to align clock domains and lanes for efficient data transfer, using techniques like phase interpolation and flow control signaling on a reverse link to optimize power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high bandwidth data communication is implemented between dice, then data transfer rate is improved, but power consumption increases significantly
Solution Approach 1:
The patent implements periodic calibration actions at predetermined intervals to adjust phase relationships between parallel and serial clocks. This periodic maintenance enables the system to sustain high-speed data transfer rates while consuming less power by optimizing timing alignment only when necessary, rather than continuously monitoring and adjusting.
Solution Approach 2:
The patent dynamically adjusts phase parameters of clock signals to optimize the timing relationship between parallel clock domains and serial data links. By changing phase parameters adaptively, the system achieves high bandwidth communication with minimized power consumption, as proper phase alignment reduces the need for continuous high-power signal driving.
2Reliability
If phase calibration is performed continuously to maintain timing requirements, then data link reliability is improved, but power consumption increases
Solution Approach 1:
The patent performs phase calibration periodically at predetermined intervals rather than continuously. This approach maintains timing synchronization reliability by regularly adjusting phase relationships between parallel and serial clocks, while significantly reducing power consumption by avoiding continuous calibration operations.
Solution Approach 2:
The system includes phase detection circuitry that automatically monitors and detects phase relationships between clock signals, enabling self-calibration without requiring external intervention. This self-service mechanism maintains timing reliability while minimizing power consumption by only activating calibration when phase drift exceeds thresholds.
3Productivity
If parallel clock domains are used for high-speed data generation, then data transfer rate is improved, but clock skew between domains increases
Solution Approach 1:
The patent introduces a phase detection and adjustment mechanism that acts as an intermediary between parallel and serial clock domains. This intermediary component monitors phase relationships and applies corrective phase shifts to align clocks, thereby enabling high-speed parallel data generation while maintaining precise timing alignment across domains.
Solution Approach 2:
The system dynamically adjusts phase parameters of clock signals to optimize the timing relationship between parallel and serial domains. By changing phase parameters adaptively, the patent achieves high bandwidth communication with minimized power consumption, as proper phase alignment reduces the need for continuous high-power signal driving.
Data Source
AI summary
Systems and methods are disclosed for clock phase calibration between source logic and a coupled serial data link transmitter, enabling low-latency synchronization into the transmitter. In calibration mode, a phase relationship is monitored between a first clock, driving the source logic, and a second clock, tightly synchronized with a serial clock of the data link. The first clock is adjusted to a first phase at which the first and second clocks are aligned. The first clock phase is set for operation mode based on the first phase. Monitoring uses a D-type flip-flop as a phase detector. Adjustment is in steps of half the serial clock period. Variations are disclosed.