Twisted Wire Pair Network Interface Power Management
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Solution Overview
Problem
Current communication networks, particularly in automotive and industrial environments, face challenges in efficiently managing power consumption and synchronization of communication frames, especially in severely constrained environments where electromagnetic compatibility and temperature requirements must be met.
Innovation Solution
A method and device implementation that includes a network interface with a 1000BASE-T1 PHY processing device capable of entering a low power mode, using a counter to determine timing for powering up and exiting low power mode based on signals received over a twisted wire pair, and supporting Energy Efficient Ethernet (EEE) with finer frame resolution for quicker clock locking and synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the network interface device operates continuously to maintain communication readiness, then communication responsiveness is improved, but power consumption increases
Solution Approach 1:
The network interface device implements periodic wake-up intervals where the receiver is powered on at predetermined times to check for wake-up frames, rather than operating continuously. This allows the device to enter low-power states between intervals while still maintaining the ability to respond to communication requests.
Solution Approach 2:
The device powers up the receiver portion in advance at predetermined wake-up intervals before potential communication needs arise, allowing it to be ready to receive wake-up frames without maintaining full operational state continuously. This preliminary preparation enables quick response while minimizing power consumption.
2Reliability
If the receiver is powered up continuously to detect wake-up signals, then wake-up signal detection reliability is improved, but power consumption increases
Solution Approach 1:
The receiver is powered on periodically at predetermined wake-up intervals to detect wake-up frames, rather than operating continuously. This periodic operation maintains detection capability while significantly reducing power consumption during low-activity periods.
Solution Approach 2:
The power state of the receiver is dynamically changed between active and low-power states based on whether it is a predetermined wake-up interval. This dynamic power management allows the system to adapt its power consumption to actual communication needs.
3Speed
If the network interface device uses finer frame resolution for synchronization, then synchronization speed is improved, but device complexity increases
Solution Approach 1:
The communication frame is divided into multiple smaller sub-frames or symbols, allowing the device to achieve synchronization by detecting transitions at these finer granularity levels. This segmentation enables faster clock locking without requiring complex synchronization circuits.
Solution Approach 2:
Instead of achieving synchronization through complex time-domain processing, the patent uses frequency-domain approaches by analyzing signal transitions at finer symbol boundaries. This dimensional change in the analysis approach enables faster synchronization with simpler hardware.
Data Source
AI summary
A first device receives a block encoded communication frame from a second device via a single communication channel on a twisted wire pair. The communication frame comprises a plurality of partial frames. The first device maintains a first counter that indicates a count of partial frames corresponding to communication frames exchanged between the first device and the second device. While the first device is in a low power mode of operation: the first device uses the first counter to determine timing of a window, powers up at least a receive portion of the first network interface device, and determines, during the window, whether the second device transmitted a signal configured to prompt the first device to exit the low power mode of operation. In response to the second device transmitting the signal, the first device exits the low power mode of operation.