Redriver Circuit Compliance Mode Detection
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Solution Overview
Problem
The USB 3.0 protocol lacks a mechanism to determine the compliance test mode without knowledge of data being passed to and from the USB device, leading to signal degradation and potential corruption of USB traffic due to inadequate control over de-emphasis during compliance testing.
Innovation Solution
A method for configuring a redriver circuit to detect compliance test mode by monitoring input ports for valid signal levels and disabling or enabling de-emphasis based on detected compliance patterns, allowing the redriver to intelligently manage signal conditioning during compliance testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If de-emphasis is continuously enabled during compliance testing, then signal integrity is maintained, but power consumption increases and signal corruption occurs during idle periods
Solution Approach 1:
The patent applies dynamics by making the de-emphasis function adjustable and controllable based on operational conditions. The redriver circuit includes control logic that dynamically enables or disables de-emphasis based on whether compliance testing is detected, allowing the system to adapt its signal conditioning behavior to current operational requirements rather than operating in a fixed state
Solution Approach 2:
The patent changes the de-emphasis parameter conditionally based on detected compliance testing. During compliance testing, de-emphasis is disabled to prevent signal corruption of compliance patterns, while during normal operation it remains enabled to maintain signal integrity. This parameter change is controlled by detecting the presence of remote receiver termination on both input ports
2Reliability
If IC chips are designed for worst-case compliance scenarios, then signal quality is ensured, but manufacturing cost and power consumption increase
Solution Approach 1:
The redriver circuit performs self-service by automatically detecting compliance testing modes through monitoring input ports for specific patterns and remotely received termination conditions. The circuit autonomously determines when to enable or disable de-emphasis without external control, making the system self-aware of its operational context and self-adjusting accordingly
Solution Approach 2:
The patent implements preliminary action by detecting compliance testing conditions before they affect signal integrity. The redriver monitors for the presence of remote receiver termination and specific signal patterns, and preemptively disables de-emphasis when compliance testing is detected, preventing signal corruption before it occurs
3Adaptability or versatility
If the IC is placed far from connectors to accommodate multiple ports, then device versatility is improved, but signal degradation increases
Solution Approach 1:
The redriver circuit acts as an intermediary between the IC and the connectors/devices. It receives degraded signals from distant connectors, conditions them through de-emphasis or other signal processing, and restores signal quality before passing them to the IC. This intermediary function allows the IC to be positioned optimally for versatility while maintaining signal integrity through the redriver's signal conditioning
Data Source
AI summary
Consistent with embodiments of the present disclosure, a method involves a redriver circuit with compliance test mode features. A redriver circuit is configured to process received compliance patterns for a compliance test mode. A compliance test mode is detected by a redriver circuit having a first input port and a second input port. The redriver detects the presence of a remote receiver termination on both input ports, monitors both input ports to detect received data and enters compliance test mode in response to no received data being detected on the input ports for a set period of time. Compliance patterns are tracked by monitoring for valid signal levels on the second input port. De-emphasis is controlled on at least one input port in response thereto.