Multi-Level Loopback for Automated USB4 Controller Testing
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Solution Overview
Problem
The manual testing of USB4 host and device controllers is time-consuming and labor-intensive, especially at commercial volumes, requiring connection between both controllers, which increases costs and time.
Innovation Solution
A method and system for automated testing of standalone USB4 controllers using multi-level loopback, where a configuration register sets data to pass through components of the controller, allowing data to loop back and compare for integrity, eliminating the need for connection to another controller during testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If manual testing method is used to test USB4 controllers, then testing can be performed with basic equipment, but testing time and labor cost increase significantly
Solution Approach 1:
The USB4 controller is configured to perform self-testing through loopback mechanisms where the controller tests itself by transmitting test packets through its own internal components and comparing received packets with original packets. This eliminates the need for external testing equipment and manual operations, resolving the contradiction between testing simplicity and testing time.
Solution Approach 2:
The testing method implements feedback by having the USB4 controller transmit test packets through its internal components and then compare the received packets with the original transmitted packets. This automated feedback mechanism enables rapid self-verification of controller functionality without manual intervention, reducing both testing time and labor cost while maintaining simplicity.
2Reliability
If connection between USB4 host controller and device controller is required for testing, then comprehensive functionality can be verified, but testing cost and complexity increase
Solution Approach 1:
The testing method segments the USB4 controller testing into multiple independent loopback levels (internal loopback, MAC layer loopback, PHY layer loopback). Each segment tests specific functional components independently, allowing comprehensive functionality verification without requiring connection to another controller, thus reducing testing system complexity while maintaining reliability.
Solution Approach 2:
The patent introduces configuration registers as intermediaries that control the loopback testing process. These registers enable the USB4 controller to route test packets through different internal paths and components, allowing comprehensive functionality verification of various controller modules without external connections, thereby reducing testing system complexity while maintaining thoroughness.
3Reliability
If connection between two controllers is established for testing, then end-to-end communication can be tested, but testing cost and setup time increase
Solution Approach 1:
The USB4 controller performs self-testing by transmitting test packets through its own internal communication paths and comparing received packets with original packets. This self-service approach verifies end-to-end communication functionality within the single controller without requiring connection to another controller, eliminating setup complexity and cost while maintaining communication verification reliability.
Solution Approach 2:
The testing method creates copies of test packets that are transmitted through the USB4 controller's internal communication paths. By comparing the copied received packets with the original transmitted packets, the system verifies communication functionality without needing a second controller, simplifying testing setup while maintaining verification reliability.
Data Source
AI summary
A method of testing a connectivity controller includes, in part, setting a configuration register disposed in the connectivity controller to a first value; causing a first data stored in a first section of a memory associated with the connectivity controller to be forwarded and pass through at least a first component of the connectivity controller and a second component of the connectivity controller, in sequence, in response to the first value; returning data received by the second component, via the first component, for storage in a second section of the memory; comparing, by a processor, the first data to the data returned and stored in the second section of the memory; and verifying the test if the first data matches the returned data.