Testing solutions for USB4 - Universal Serial Bus 4
2020-08-20 | 3 min read
The USB Implementers Forum (USB-IF) announced USB4 in March 2019 and released the specification in September 2019. Based on the Thunderbolt 3 protocol, USB4 uses a Type-C connector, which enables bonding of two independent 20 Gb/s links into one logical 40 Gb/s link. USB4 supports other standards through ALT mode. The host implements USB 3.2 at 5G / 10G, USB 2.0, and DisplayPort (DP) and can tunnel USB, DP, and PCIe®. Keysight offers a suite of hardware and software tools to help you design and implement USB4.
USB4 has seen significant changes compared with USB 3.2. These are some of the testing differences in the USB4 implementation:
|return loss Tx and Rx||retimer-specific measurements|
|calibration required for transmitter equalization||cross-talk generation|
|calibration required for receiver equalization||new jitter measurements|
|doubling of PHY bit rate from 10 Gb/s to 20 Gb/s||new phase and slew rate measurements|
|signaling on all four Type-C high-speed pairs||added skew measurements|
|de-embedding of test cables||common mode interference|
|new link loss budgets for 10G / 20G||separate jitter cocktails for 10G / 20G / TP2 / TP3|
|link optimization prior to bit error ratio test||built-in error detector|
Figure 2 provides a comprehensive overview of hardware and software needed to complete transmitter and receiver tests for USB4 Type-C.
The USB4 Type-C solutions matrix uses the following tools:
- Infiniium UXR Series high-perfornance oscilloscopes
- M8020A J-BERT high-performance BERT
- E5080B ENA vector network analyzer
- D9040USBC USB4 transmitter test software
- N5991U40A USB4 receiver test software
- N7019A USB4 Type-C Active link test fixture
- D9010USBP supports
- USB4 low-speed sideband
- power delivery
- high-speed protocol
- eUSB2 protocol trigger decode
- E5080B Return Loss software.
Keysight offers a suite of testing solutions that will help you implement your USB4 design, including testing all supported technologies:
• USB power delivery
• channel characterization
• sideband testing
As described, Keysight offers instrumentation, software, and fixtures for testing and characterizing the entire USB4 Type-C ecosystem.