Node Array Track Plan With Variable Wire Widths for Clock Skew
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing clock distribution methods in AI processors result in significant clock skew, leading to inefficiencies and increased design complexity, area, and power consumption, as well as suboptimal power supply quality.
Innovation Solution
A node array with a track plan that utilizes wires of varying widths and interleaved configurations to manage clock skew, ensuring fixed delays and timing offsets between neighboring nodes, allowing for mesochronous clocking with reduced skew and improved power supply quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional clock distribution methods are used in AI processors, then clock signals can be provided to all nodes, but significant clock skew occurs leading to increased design complexity, area, and power consumption
Solution Approach 1:
The patent applies local quality by making wires in different directions have different widths based on their specific timing requirements. Wires carrying signals in the clock propagation direction are made narrower, while wires carrying signals in the opposite direction are made wider. This localized differentiation allows each wire to be optimized for its specific function, reducing overall clock skew without requiring complex global redesign of the entire clock distribution network.
Solution Approach 2:
The patent changes the physical parameter of wire width to control signal propagation delay. By adjusting wire width, the patent directly modifies the electrical characteristics (resistance, capacitance) of the transmission medium, thereby controlling timing delays. This parameter change approach allows precise adjustment of signal arrival times at different nodes, reducing clock skew while maintaining simpler overall system design.
2Reliability
If traditional clock distribution methods are used, then all nodes can operate, but clock skew increases leading to increased power consumption
Solution Approach 1:
The patent reduces power consumption by applying local quality optimization to wire dimensions. Instead of uniformly increasing wire width throughout the entire clock distribution network (which would increase power consumption across all wires), the patent selectively widens only those wires that require additional delay compensation. This localized approach achieves the necessary timing adjustment while minimizing the total area and power overhead of the clock distribution network.
3Ease of manufacture
If uniform wire widths are used in the node array, then manufacturing is simpler, but clock skew cannot be effectively reduced
Solution Approach 1:
The patent resolves the contradiction between manufacturing simplicity and clock skew control by applying local quality differentiation only where timing adjustments are needed. The design maintains uniform wire widths for the majority of the clock distribution network, preserving manufacturing simplicity. selective wire width variations are introduced only in specific locations where timing compensation is required, achieving effective clock skew reduction without significantly complicating the overall manufacturing process.
4Manufacturing precision
If wire widths are varied to reduce clock skew, then timing precision improves, but device complexity increases
Solution Approach 1:
The patent achieves high timing precision while limiting device complexity by applying wire width variations only locally where needed for timing compensation. The majority of the wire network maintains uniform dimensions, keeping the overall configuration relatively simple. The selective differentiation of wire widths in specific critical paths provides the necessary timing precision without requiring complex wire configurations throughout the entire device.
Data Source
AI summary
Track plans to improve clock skew arc disclosed. In one aspect, a node array includes a plurality of nodes with clock distribution circuitry configured to distribute a clock signal to each of the nodes. The clock signal propagates in at least a first direction between adjacent nodes. The node (202) further includes a track plan comprising a plurality of wires to carry communication signals propagating between adjacent nodes. The plurality of wires include a first wire (404) configured to carry a first communication signal in a direction opposite to the first direction and a second wire (402) configured to carry a second communication signal in the first direction, where the first wire has a width that is greater than a width of the second wire.