Multi-Chip Semiconductor Clock Synchronization via Delay Control
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Solution Overview
Problem
In semiconductor devices, miniaturization leads to inconsistent timing of clock signals due to small driving current and inconsistent transistor properties, causing deviations in clock signal transfer across the chip, especially when multiple levels of buffers are connected for signal transfer to separated areas.
Innovation Solution
A semiconductor apparatus comprising a first chip with a phase locked loop and logical circuits, and a second chip with delay control and delay circuits, where the second chip generates a delay control signal to delay clock signals in multiple stages, ensuring synchronized operation with the first chip, using a low process to reduce manufacturing inconsistencies and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If multiple levels of buffers are connected to transfer clock signals to separated areas, then the clock signals can reach distant areas of the chip, but the relative timings of clock signals deviate due to manufacturing inconsistencies and small driving current
Solution Approach 1:
A delay control circuit is introduced as an intermediary component between the clock signal source and the buffers. This delay control circuit generates delay control signals that compensate for timing deviations introduced by the buffers and wiring, thereby maintaining clock signal timing consistency across the chip despite the extended signal transfer distance
Solution Approach 2:
The delay control circuit dynamically adjusts the delay amount of delay elements based on the cycle of a reference clock signal. By changing the delay parameter in response to detected clock signal characteristics, the system compensates for timing deviations and maintains synchronized operation across different chip regions
2Quantity of substance
If chip size is reduced to achieve high integration, then more devices can be integrated, but clock signal transfer timing becomes more inconsistent across the chip
Solution Approach 1:
The delay control circuit adjusts delay parameters based on the reference clock signal cycle to compensate for timing deviations. This dynamic parameter adjustment ensures that clock signals maintain consistent timing relationships across the miniaturized chip, enabling high integration while preserving timing precision
Solution Approach 2:
The delay control circuit detects the cycle of the reference clock signal and uses this information to adjust the delay amount. This feedback mechanism allows the system to automatically compensate for timing deviations caused by miniaturization effects, maintaining clock signal consistency despite reduced chip dimensions
3Manufacturing precision
If delay circuits are configured in multiple stages, then clock signal timing can be precisely controlled, but the device complexity increases
Solution Approach 1:
The delay control function is divided into multiple stages with delay elements connected in series. Each stage contributes to the total delay amount, allowing precise control of clock signal timing through the cumulative effect of individual delay stages while maintaining a modular and manageable structure
Data Source
AI summary
A semiconductor apparatus includes a first chip and a second chip mounted on the first chip. The first chip includes a first port that receives an operation clock signal, and a first circuit that operates in synchronization with the operation clock signal. The second chip includes a delay control part that generates a delay control signal indicating a delay amount based on a cycle of a reference clock signal, plural delay circuits that are connected in multiple stages and delay clock signals input to the plural delay control circuits based on the delay control signal and sequentially output the delayed clock signals to a subsequent stage, and a second port that is connected to the first port and receives the operation clock signal based on the delayed clock signals output from the plural delay circuits.