Four-Wire Dual Simplex Links for Low-Power Wake Signaling
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Solution Overview
Problem
Existing high-speed electronic communication protocols face challenges in efficiently transitioning between low-power and high-speed modes due to the time required for reestablishing common mode voltages and coordinating transmissions, particularly when using capacitive coupling, and they often require additional sideband wires for signaling.
Innovation Solution
A dual simplex communication protocol utilizing dual two-wire channels that switch between in-band and out-of-band signaling, allowing independent transitions between high-speed and low-power modes, with one wire used for flow control and the other for wake commands, and enabling multiple lanes to operate in parallel for high-speed communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional sideband wires are used for signaling, then signaling reliability is improved, but device complexity increases
Solution Approach 1:
The patent makes the high-speed data wires serve dual functions: transmitting data at high speeds during active mode and carrying signaling information during low-power mode. This multi-functionality eliminates the need for dedicated sideband signaling wires, reducing device complexity while maintaining signaling reliability through the use of existing wire infrastructure.
2Speed
If all channels operate in high-speed mode, then communication speed is improved, but energy consumption increases
Solution Approach 1:
The patent implements dynamic mode switching capability where communication channels can transition between high-speed mode and low-power mode based on actual data transmission needs. During active data transfer, channels operate at high speed; during idle periods, they switch to low-power mode with minimal signaling, optimizing the balance between communication speed and energy consumption.
Solution Approach 2:
The system employs periodic transitions between operational modes, alternating between high-speed data transmission periods and low-power signaling periods. This periodic action allows the system to maintain high communication performance when needed while reducing energy consumption during idle intervals through controlled mode switching.
3Adaptability or versatility
If channels switch from low-power to high-speed mode, then communication capability is improved, but transition time increases
Solution Approach 1:
The patent prepares signaling pathways and control mechanisms in advance during low-power mode, so that when high-speed transmission is needed, the transition can begin immediately without extensive setup time. Critical signaling functions are pre-configured to enable rapid mode switching.
Solution Approach 2:
The patent combines data transmission and signaling functions into the same physical infrastructure (the four wires), eliminating the need for separate signaling wire transitions. This merging allows mode switching to occur more rapidly since the same wires carry both data and control signals, reducing overall transition time.
Data Source
AI summary
A high speed but power-efficient electronic communications protocol may comprise dual simplex links, each operating in a differential high-speed mode and each capable of a low-speed signaling mode. When both links operate in high speed mode, signaling is performed in-band, with signals embedded as metadata attached to transmitted packets. When one of the links is put into a low-power mode, the return-path signaling may be performed on the two wires previously used for high-speed transmissions. One wire may be used for flow control or other signaling, while the other wire may be used for a wake command, which may initiate the low-power mode to be elevated to a high-speed mode. Multiple lanes may be organized to operate in parallel for each link, allowing for a very high speed communications protocol that may be easily switched into and out of a low-power state without additional sideband wiring.