Clock Load Alignment for Integrated Circuit Layout Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Integrated circuits face significant clock skew issues due to varying wire lengths, which lead to unnecessary delays and hinder data processing capabilities, as traditional placement and routing engines often result in unorganized clock load placements and inefficient wire connections.
Innovation Solution
A method involving initial cell optimization, alignment of clock loads into columns, and re-optimization of the integrated circuit layout using aligned clock loads to minimize wire length and reduce clock skew, where clock loads are grouped and connected with orthogonal straps to efficiently connect to a clock buffer, thereby reducing latency and skew.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional placement and routing engines are used for integrated circuit layout, then the layout can be generated with basic functionality, but clock skew increases and wire length increases
Solution Approach 1:
The patent applies preliminary action by performing a first optimization pass to establish initial clock load placements before final routing is completed. This preliminary placement ensures that clock loads are positioned optimally relative to each other and to clock buffers, preventing excessive wire length from being introduced later in the design process.
Solution Approach 2:
The patent introduces a hierarchical dimension to clock load placement by organizing clock loads into multiple levels (first-level clock buffers and second-level clock buffers). This dimensional organization allows for systematic optimization of wire connections at different scales, reducing overall wire length while maintaining placement precision.
2Manufacturing precision
If traditional placement and routing engines are used for integrated circuit layout, then the layout can be generated with basic functionality, but clock skew increases
Solution Approach 1:
The patent performs preliminary optimization of clock load placements before final routing, ensuring that clock loads are pre-positioned to minimize skew. This early intervention allows the placement engine to account for clock distribution requirements, preventing excessive skew from developing later.
Solution Approach 2:
The patent segments the clock distribution network into hierarchical levels with multiple clock buffers serving different regions. This segmentation allows each segment to be optimized independently for minimal skew, while the overall system maintains synchronized clock distribution across the entire chip.
3Adaptability or versatility
If clock loads are placed without alignment, then placement flexibility is maintained, but wire length increases and routability decreases
Solution Approach 1:
The patent performs preliminary alignment of clock loads into organized patterns before final routing decisions are made. This preliminary organization establishes a structured framework that guides subsequent routing operations, improving routability while maintaining adaptability through the two-pass optimization approach.
Solution Approach 2:
The patent introduces organizational structure by arranging clock loads in aligned patterns and hierarchical levels. This dimensional organization creates regularity that improves routability, while the hierarchical clock buffer structure maintains adaptability for different design configurations.
4Reliability
If unnecessary delay is introduced to account for worst case clock skew, then clock signal synchronization is ensured, but data processing speed decreases
Solution Approach 1:
The patent changes the parameters of clock load placement to minimize actual wire length and skew. By optimizing placement parameters through two-pass optimization and alignment, the system reduces the worst-case delay margin that would otherwise be needed, thereby improving data processing speed while maintaining synchronization.
Solution Approach 2:
The patent performs preliminary optimization to achieve better clock distribution characteristics before timing closure. This early optimization reduces the actual skew, allowing the design to use smaller timing margins and achieve higher performance without sacrificing synchronization reliability.
Data Source
AI summary
A computing device may include a memory to store instructions and a processor. The processor may execute the instructions to conduct an initial cell optimization for an integrated circuit layout; designate clock loads associated with a first-level clock buffer; receive, after the initial standard-cell optimization, a set of initial placement locations; align the clock loads according to the set of placement locations; conduct, using the aligned clock loads, a re-optimization of the integrated circuit layout; and store, in the memory, a circuit layout based on the re-optimization.