IC Binning Methodology for Signal Shielding and Power Distribution
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Solution Overview
Problem
Existing routing tools for integrated circuits are inadequate in predicting cross-coupling noise, propagation delays, and power distribution, often requiring iterative design adjustments and failing to efficiently incorporate decoupling capacitors and power grids.
Innovation Solution
A binning methodology that defines specific widths and spacings for signal and shield wires, with a layout post-processing flow that includes tools for shield insertion, decoupling capacitor placement, and via drop, ensuring predictable noise shielding, timing, and power distribution, allowing for correct-by-construction design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If arbitrary routing is used to connect components, then routing flexibility is improved, but prediction of cross-coupling noise and propagation delays deteriorates
Solution Approach 1:
The routing space is segmented into predefined bins with specific width and spacing characteristics. Each bin is characterized in advance for its noise and timing properties, allowing the router to select bins that meet performance requirements while maintaining routing flexibility.
Solution Approach 2:
The bin characteristics including noise and timing properties are calculated and stored in advance before routing occurs. This preliminary characterization enables the router to make informed decisions about bin selection without requiring iterative post-routing analysis.
2Reliability
If iterative routing adjustment is performed to address noise and timing issues, then noise and timing quality is improved, but design turnaround time increases
Solution Approach 1:
All bin characteristics including noise and timing metrics are pre-calculated and stored in a database before routing begins. The router directly selects bins that satisfy design requirements, eliminating the need for iterative post-routing analysis and adjustment.
Solution Approach 2:
The bin structure inherently provides noise shielding and timing characteristics through its predefined geometry. The router automatically selects appropriate bins based on design requirements, with the bin characteristics themselves providing the noise and timing protection without requiring additional iterative corrections.
3Object-affected harmful factors
If shield wires are added to shield signal wires from aggressors, then cross-coupling noise is reduced, but device complexity increases
Solution Approach 1:
The signal wire routing and noise shielding functions are merged into a single bin structure. The bin geometry inherently provides both signal transmission and noise protection, eliminating the need for separate shield wire routing and reducing overall structure complexity.
Solution Approach 2:
The bin structure itself provides noise shielding through its predefined geometry and spacing characteristics. The same structural elements that carry signals also provide the noise protection, with the bin characteristics automatically providing shielding without requiring additional dedicated shield structures.
4Power
If routing tools leave space for power grid, then power distribution capability is improved, but routing density deteriorates
Solution Approach 1:
The bin structure serves multiple functions simultaneously: it provides signal routing, noise shielding, and power distribution capabilities. The same geometric parameters that define signal path characteristics also define power grid characteristics, eliminating the need for separate space allocation.
Solution Approach 2:
The signal routing and power distribution functions are merged into the same bin structure. The bin geometry and spacing parameters simultaneously determine both signal integrity and power delivery characteristics, allowing both functions to coexist without competing for separate space.
5Area of stationary object
If routing tools create dense routing regions, then routing area utilization is improved, but room for power grid and decoupling capacitors deteriorates
Solution Approach 1:
The bin structure provides multiple functions including signal routing, noise shielding, power distribution, and decoupling capacitor placement. The predefined bin geometry inherently accommodates all these functions simultaneously, allowing dense routing while maintaining power grid and capacitor insertion capability.
Data Source
AI summary
A method for binning and layout of an integrated circuit design which includes providing a table setting forth predefined widths of signal wires and corresponding spacing to shield wires, characterizing effects on timing, noise, and power distribution based on predefined widths and spacing combinations as functions of the length of the signal wire, and laying out the integrated circuit design based upon the predefined widths of signal wires and corresponding spacing to shield wires. The shield wires are adjacent and on both sides of the routed signal wire.