Switching Matrix Layout for Multi-Signal Selection With Less Silicon
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Solution Overview
Problem
Conventional multiplexers in microcontrollers and system on chip devices face increased complexity and silicon real estate challenges when selecting multiple signals from a large group, limiting the number of possible combinations and requiring significant resources.
Innovation Solution
A switching matrix with multiple n-to-1 multiplexers is used, allowing for flexible assignment modes where overlapping input sets are assigned to multiple multiplexers, enabling the selection of multiple signals from a larger pool with reduced resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional multiplexers are used to select multiple signals from a large group, then signal selection capability is improved, but device complexity and silicon real estate requirements increase substantially
Solution Approach 1:
The patent divides a large group of input signals into multiple smaller subsets, with each subset assigned to a separate multiplexer. For example, 16 input signals are divided into four subsets of 4 signals each, and each subset is handled by a dedicated multiplexer. This segmentation reduces the complexity of individual multiplexers while maintaining the overall signal selection capability.
Solution Approach 2:
The patent introduces a second dimension of selection by assigning multiple multiplexers to handle different subsets of the same input signals. Instead of using a single complex multiplexer to select from all 16 signals, the system uses multiple simpler multiplexers, each selecting from a subset, thereby adding a dimensional layer to the selection process.
2Quantity of substance
If the number of multiplexers is reduced to minimize silicon real estate, then resource efficiency is improved, but the number of achievable signal combinations is limited
Solution Approach 1:
The patent makes each input signal subset universally accessible to multiple multiplexers. Each multiplexer can select from its assigned subset, and by strategically overlapping the subsets assigned to different multiplexers, the system achieves a wide range of signal combinations using fewer multiplexers than a conventional approach would require.
Solution Approach 2:
The patent enables dynamic reconfiguration of signal assignments by allowing different multiplexers to share common input signals. This dynamic sharing of input signals across multiple multiplexers allows the system to adapt to different signal combination requirements without increasing the number of physical multiplexers.
3Measurement precision
If each signal is assigned a dedicated multiplexer from a pool of eight signals, then signal selection precision is improved, but the system cannot select more than two signals from a group of 16
Solution Approach 1:
The patent merges the input signal pools of multiple multiplexers by having them share common input signals. Instead of having completely separate 8-signal pools for each multiplexer, the system allows overlapping input signal assignments, so that multiple multiplexers can simultaneously access the same set of input signals, thereby enabling selection of more than two signals from a group of 16.
Data Source
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AI summary
An apparatus for selecting a plurality of input signals from a plurality of y signals in a device has a switching matrix with a plurality of n to 1 mulitplexers, wherein each n to 1 multiplexer is assigned to a different input set of n of the y signals wherein a subset of less than n input signals of each set of input signals of each of the n to 1 multiplexers is also a subset of input signals of another n to I multiplexer.