Transceiver IC Low Power Idle Mode Refresh Signal
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Solution Overview
Problem
High power consumption in 10GBASE-T Ethernet systems due to bidirectional full duplex signaling, where transceivers operate at full speed even when no data is being transmitted, leading to energy wastage.
Innovation Solution
Implementing an end-of-data controller and power control circuit in transceiver integrated circuits to detect an end-of-data indicator, allowing for the selective deactivation of transceiver portions, either by switching them off or operating them in a low power idle mode, thereby reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transceivers operate at full speed in bidirectional full duplex mode, then data transmission capability is maintained, but power consumption increases significantly
Solution Approach 1:
The transceiver operates dynamically in two distinct states: active full-speed mode during data transmission and low-power idle mode during idle periods. The system transitions between these states based on data activity, allowing the transceiver to adapt its operational characteristics to current needs rather than maintaining a fixed high-power state
Solution Approach 2:
The system implements periodic LPI refresh signals that are transmitted at specific intervals to maintain the low-power idle state. This periodic action allows the transceiver to remain in low-power mode while still preserving the ability to quickly resume full-speed operation when data transmission is needed
2Use of energy by moving object
If transceivers are switched to low power idle mode, then power consumption is reduced, but the time to resume full-speed transmission increases
Solution Approach 1:
The system performs preliminary actions by maintaining synchronization signals and link state information even during low-power idle mode. The periodic LPI refresh signals keep the link alive and prepared, so when data transmission needs to resume, the transceiver can quickly transition back to full-speed mode without requiring complete re-initialization or link re-establishment
3Speed
If transceivers remain operational at full speed, then data transmission can resume immediately, but power is wasted when no data is being transmitted
Solution Approach 1:
The system changes key operational parameters of the transceiver based on data activity. During idle periods, parameters such as clock frequency, signal amplitude, and processing intensity are reduced to low-power settings. When data transmission resumes, these parameters are rapidly adjusted back to full-speed values, optimizing both energy efficiency and transmission performance
Data Source
AI summary
A bidirectional transceiver integrated circuit (IC) includes a transmit circuit configured to transmit during a data transfer mode of operation first data over a first bidirectional communication channel to a link partner. The transmit circuit is configured, during a low power mode of operation, to transmit an encoded refresh signal over the first bidirectional communication channel to the link partner. A receiver circuit is configured to receive during the data transfer mode of operation second data independent of the first data over the first bidirectional communication channel. An encoder is configured, during the low power mode of operation, to encode third data into a refresh signal to generate the encoded refresh signal.