Modular Analog Transmit Interface for Multi-Standard I/O Reduction
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Solution Overview
Problem
The increasing complexity and density of integrated circuits pose challenges in managing the number of I/Os, as existing semiconductor chip interfaces require separate and complex circuitry to support multiple standards like MIPI DPHY and MIPI CPHY, leading to inefficient use of output nodes and increased form factor.
Innovation Solution
A modularized analog transmit interface is designed using single-ended transmitter circuits that can operate in both MIPI DPHY and MIPI CPHY modes, sharing output nodes and reducing complexity by utilizing fewer pads, allowing for efficient support of multiple interfaces through a few I/Os.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate circuitry is used to support multiple interface standards, then interface compatibility is improved, but device complexity and I/O count increase
Solution Approach 1:
The patent implements a universal interface circuit that can operate in multiple modes (MIPI DPHY and MIPI CPHY) using the same physical I/O pins. The circuit includes mode selection logic and configurable transmitter/receiver components that can be dynamically switched between different interface standards, allowing one circuit to perform multiple functions that would traditionally require separate dedicated circuits for each standard.
Solution Approach 2:
The interface circuit employs dynamic reconfiguration capabilities where the circuit topology and signal routing can be changed at runtime based on the selected interface mode. Switches and multiplexers allow the circuit to dynamically adapt its configuration, transforming from a static separate-circuitry approach to a dynamic shared-circuitry approach that reduces overall device complexity.
2Adaptability or versatility
If separate circuitry is used to support multiple interface standards, then interface compatibility is improved, but the number of I/Os increases
Solution Approach 1:
The patent enables the same physical I/O pins to serve multiple interface standards through mode selection circuitry. The transmitter and receiver components are designed to be reconfigurable, allowing the same pins to be used for either MIPI DPHY or MIPI CPHY operations, thereby reducing the total number of I/O pins required compared to having dedicated pins for each standard.
Solution Approach 2:
The patent merges the functionality of separate DPHY and CPHY circuits into a single integrated interface block. By combining the transmitter, receiver, and mode selection logic into one unified circuit that shares common I/O pins, the design reduces the overall I/O count while maintaining support for both interface standards through temporal or configurational multiplexing.
3Adaptability or versatility
If multiple transmit channels are implemented, then interface versatility is improved, but area and form factor increase
Solution Approach 1:
The patent implements dynamic channel sharing where the same physical transmit channel can be configured for different interface standards at different times. The circuit includes dynamic switching elements that allow a single transmit channel to be reassigned between MIPI DPHY and MIPI CPHY modes, eliminating the need for parallel static channels for each standard and thereby reducing the overall circuit area.
Solution Approach 2:
The patent transitions from a spatial dimension approach (separate physical channels for each standard) to a temporal/configuration dimension approach (single channel switched between standards). By adding the dimension of time and configurability to the channel architecture, the design achieves multiple interface capabilities without proportionally increasing the physical area occupied by transmit channels.
Data Source
AI summary
An apparatus is described having an electrical interface that supports a first specification and a second specification. The first specification specifies differentially transmitted data. The second specification specifies at least three transmitted data signals. The electrical interface includes a plurality of modular transmitter circuits where each transmitter circuit includes a single ended driver and a select circuit. The select circuit is to select either one end of a differential signal associated with the first specification or one of the at least three transmitted data signals associated with the second specification.