Metal-Configurable I/O Structure With Shared Calibration and ESD
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Solution Overview
Problem
Integrated circuit design faces challenges in providing input/output (I/O) functionality that meets multiple standards, leading to increased design time, power usage, and performance degradation due to the need for unique power structures, electrostatic discharge (ESD) configurations, and calibration circuitry for each I/O slot, which complicates chip design and increases area and power requirements.
Innovation Solution
A configurable I/O block with a plurality of subcells and a metal layer that couples selected subcells to meet specific I/O requirements, along with a calibration block and reference voltage block to adjust I/O signals and voltage levels, allowing for flexible interfacing with various I/O standards using a common base template and shared calibration and ESD structures across the die.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple I/O slots are used to meet different I/O standards, then adaptability to various standards is improved, but device complexity and design time increase
Solution Approach 1:
The patent implements a universal I/O slot design where a single slot can be configured to support multiple I/O standards (LVCMOS, HSTL, SSTL, CML, etc.) through programmable logic and configurable circuit elements. This eliminates the need for separate dedicated slots for each standard, reducing overall device complexity while maintaining adaptability across different I/O requirements
Solution Approach 2:
The I/O slot incorporates dynamic reconfiguration capabilities through programmable logic devices and configurable circuit parameters that can be adjusted during operation or initialization. This allows the same physical slot to adapt its electrical characteristics, timing parameters, and signal levels to match different I/O standards, providing flexibility without requiring multiple static slot designs
2Reliability
If unique power structures and ESD structures are provided for each I/O slot, then reliability for each standard is improved, but area and power usage increase
Solution Approach 1:
The patent consolidates power structures and ESD protection circuits into shared resources that serve multiple I/O slots. Instead of dedicating separate power domains and ESD structures to each slot, the design implements common power rails with dynamic power management and shared ESD protection networks that can protect multiple slots simultaneously, thereby reducing the total area required for these support structures
3Measurement precision
If calibration circuitry is duplicated for each I/O slot, then measurement precision for each slot is improved, but device complexity and area increase
Solution Approach 1:
The patent introduces a centralized calibration controller that acts as an intermediary between the calibration circuits and multiple I/O slots. This controller can sequentially or selectively apply calibration sequences to different slots as needed, rather than requiring each slot to have independent calibration hardware. The calibration controller manages the calibration process dynamically, providing precise calibration capability across all slots while using a single shared calibration circuit implementation
4Adaptability or versatility
If I/O slots are designed independently from different IP vendors, then adaptability to different requirements is improved, but integration complexity and design time increase
Solution Approach 1:
The patent employs a modular I/O slot architecture where each slot is designed as an independent functional unit with standardized interfaces and configuration mechanisms. This segmentation allows different I/O slot implementations from various IP vendors to be integrated into the system through uniform connection protocols and configuration procedures, reducing the overall integration complexity while preserving the adaptability benefits of having slots designed by multiple specialized vendors
Data Source
AI summary
A metal configurable I/O structure for an integrated circuit is disclosed. The metal configurable I/O structure may be configured for one of any of a plurality of I/O specifications. Preferably a common voltage reference and a common current reference is generated for provision to a plurality of I/O structures.