Programmable Clock Tree Delay Buffers for Clock Skew Alignment
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Solution Overview
Problem
Integrated circuit devices face operational inefficiencies and increased latency due to clock skew, which is introduced as clock signals travel through the clock tree, exacerbated by variations in branch length, stages, and environmental factors, making it difficult to synchronize the operation of multiple logic regions.
Innovation Solution
Incorporating a clock tree with tunable delay buffers at each juncture, which adjust the clock signal based on expected skew, and using delay measurement circuits to determine and mitigate clock skew, ensuring coordinated operation across logic regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the clock tree size and depth are increased to cover more logic regions, then the coverage and coordination capability are improved, but the clock skew and uncertainty increase
Solution Approach 1:
The clock tree is divided into multiple segments with individual delay buffers at different levels (root level, intermediate levels, and leaf levels). Each segment can be independently adjusted to compensate for skew, transforming a single large uncontrollable clock tree into multiple manageable segments that can be optimized locally while maintaining global coordination.
Solution Approach 2:
The patent implements dynamically adjustable delay buffers that can be programmed to different delay values based on measured skew conditions. The delay buffers transition from static fixed delays to dynamic adjustable delays, allowing the clock tree to adapt to varying operating conditions, temperature changes, and process variations to maintain timing accuracy.
2Adaptability or versatility
If the branch length variation in the clock tree is increased to accommodate different logic regions, then the flexibility and adaptability are improved, but the clock skew and arrival time uncertainty increase
Solution Approach 1:
Different delay buffers are configured with different delay characteristics tailored to their specific locations and requirements in the clock tree. Each delay buffer is optimized for its local conditions (branch length, loading, position), transforming a uniform clock tree into a heterogeneous structure where each component is optimized for its specific function and location.
Solution Approach 2:
The delay values of the delay buffers are programmatically adjusted based on measured skew conditions and operational requirements. The system changes the delay parameter of individual buffers to compensate for variations in branch length and loading, allowing the clock tree to maintain precision despite structural variations.
3Adaptability or versatility
If programmable logic elements are used to improve operational flexibility, then the functional adaptability is improved, but the clock skew and operational latency increase
Solution Approach 1:
The delay buffers are configured and pre-adjusted before the logic elements are activated or programmed. By establishing the correct delay compensation in advance, the system eliminates timing uncertainties that would otherwise cause latency when the logic elements begin operation, ensuring that clock signals arrive at the correct time regardless of the logic element configuration.
Data Source
AI summary
The present disclosure provides systems and methods for improving operation of integrated circuit device including a logic region, which includes a plurality of logic gates that operate based at least in part on a clock signal to facilitate providing a target function, and a clock tree, which includes a clock switch block that receives a source clock signal from a clock source and a branch communicatively coupled between the clock switch block and the logic region, in which the branch operates to provide the clock signal to the logic region based at least in part on the source clock signal and one or more tunable delay buffers, disposed at junctures of the clock network, that operate to apply a delay to the clock signal based at least in part on a clock skew expected to be introduced by the branch.