eUSB Repeater Detector Circuit for Low Power Start Signaling
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Solution Overview
Problem
USB ports in devices often remain inactive and unused, leading to unnecessary power consumption, as they lack efficient mechanisms to quickly detect new connections and resume data communication without significant power usage.
Innovation Solution
A signal detector circuit is implemented in an eUSB repeater that operates on low power to quickly wake from suspend states, detecting start signals on the bus and generating wake signals to resume data communication efficiently, supporting low power states defined by USB standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If USB ports remain in active state continuously, then data communication can be immediately resumed, but power consumption increases unnecessarily
Solution Approach 1:
The USB port system is divided into multiple functional components with different power states: the detector circuit remains active to monitor for connections, while the repeater logic enters low-power suspend states. This segmentation allows the system to maintain basic awareness capability without consuming full power for all functions.
Solution Approach 2:
The detector circuit performs preliminary detection of connection events and generates wake signals before the full repeater logic needs to activate. This preliminary action enables the system to prepare for data communication resumption by alerting the repeater logic in advance, reducing the time to full operation.
2Use of energy by moving object
If USB ports enter low power state completely, then power consumption decreases, but detection speed for new connections slows down
Solution Approach 1:
The system separates detection functionality into a dedicated detector circuit that maintains operational status independent of the repeater logic's power state. This segmentation ensures that connection detection continues at full speed even when the main processing logic is in low-power mode.
Solution Approach 2:
The detector circuit acts as an intermediary between the physical USB bus and the repeater logic. It continuously monitors the bus conditions and translates connection events into wake signals that can trigger the repeater logic to activate, enabling fast detection without requiring the logic to be continuously active.
3Speed
If detector circuit remains always active, then connection detection is fast, but power consumption increases
Solution Approach 1:
The detector circuit performs preliminary monitoring and signal generation activities continuously at low power, preparing wake signals in advance. When a connection is detected, the circuit has already generated the appropriate wake signal, enabling the repeater logic to activate quickly without requiring the logic itself to be continuously active.
Solution Approach 2:
Different components of the USB port system have different operational characteristics: the detector circuit operates continuously at low power for fast detection, while the repeater logic operates intermittently at full power only when needed for data communication. This local differentiation of operational quality optimizes both speed and power consumption.
Data Source
AI summary
A detector circuit is described for start signaling in an eUSB repeater. In an example, a circuit includes an analog differential transceiver configured to receive a differential data signal from a differential data bus and configured to drive a differential data signal to the differential data bus, an analog single-ended transceiver configured to receive a single-ended data signal from a single-ended data bus and configured to drive a single-ended data signal to the single-ended data bus, repeater logic coupled to the analog differential transceiver and the analog single-ended transceiver to repeat data signals between the differential data bus and the single-ended data bus, the repeater logic having an active state and a low power state, and a detection circuit coupled to the analog single-ended transceiver to detect a start signal on the single-ended data bus and to generate a wake signal to the repeater logic upon detecting the start signal.