Switch Interconnect Power-Up Circuitry for Stable Multiplexer Initialization
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Solution Overview
Problem
Existing integrated circuit technologies face challenges in efficiently controlling multiplexers during power-up and initialization phases, leading to signal contention and metastability issues due to arbitrary bit cell states and diverse input signal polarities, which affect the proper configuration and operation of switch interconnect networks.
Innovation Solution
The implementation of low-latency switch interconnect power-up circuitry that programs and enables one-hot-bit multiplexers to a common polarity state during power-up, ensuring proper connectivity and preventing signal contention by generating power-on override and initialization signals to precondition input signals and control bit cells, thus establishing a stable data state for normal operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiplexers are controlled during power-up without special circuitry, then device complexity is reduced, but signal contention and metastability issues occur due to arbitrary bit cell states
Solution Approach 1:
The power-up circuitry performs preliminary actions by pre-setting bit cell states and establishing common polarity conditions before the multiplexers begin normal operation. This preliminary configuration prevents signal contention and metastability from occurring in the first place, rather than attempting to resolve these issues after they arise.
Solution Approach 2:
The power-up circuitry acts as an intermediary component that mediates between the power-up phase and normal operation. It temporarily controls the bit cells and multiplexer inputs during the transition period, ensuring proper state establishment before disengaging and allowing normal operation to proceed without its direct intervention.
2Reliability
If power-up circuitry preconditions all input signals to common polarity, then signal contention is prevented, but power-up latency increases due to additional programming time
Solution Approach 1:
Instead of uniformly preconditioning all input signals across the entire system, the power-up circuitry applies local quality control by targeting specific bit cells and multiplexer inputs that require state establishment. This selective approach preconditions only the necessary signals to common polarity, preventing signal contention while minimizing the overall power-up time by avoiding unnecessary programming of already-proper signals.
3Ease of manufacture
If bit cells are programmed to arbitrary states during power-up, then manufacturing simplicity is maintained, but metastability issues arise affecting proper configuration
Solution Approach 1:
The power-up circuitry implements preliminary anti-action by proactively preventing metastability conditions before they can affect configuration stability. It does this by establishing common polarity states in bit cells and controlling multiplexer inputs during the power-up transition, thereby counteracting the inherent instability that would otherwise arise from arbitrary power-up states.
Data Source
AI summary
In an integrated circuit component having a switch interconnect network and a configuration memory, a constituent multiplexer of the switch interconnect network includes a plurality of pass-gates having respective outputs coupled in common to a pass-gate output node, respective inputs that constitute respective signal inputs of the multiplexer, and control inputs coupled to receive respective pass-gate control signals having logic states according to configuration data stored within the configuration memory. Power-up control circuitry within the switch interconnect network drives the pass-gate output node of the multiplexer to a predetermined voltage level following power-up of the integrated circuit component and prior to execution of a programming operation in which one or more word-lines within the configuration memory are activated to store the configuration data within the configuration memory.