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SEGGER - The Embedded Experts - J-Link Debug Probes - Isolators - USB Isolator Page 2 of 2 Target side isolation vs. Host side isolation Host side isolation forces the Host to set the USB Link to Full Speed (12MBit) when connecting to J-Link. This is typically fully sufficient and does not or not significantly reduce the debug and flash programming speed. With host side isolation, both J-Link and the target are isolated from the host, whereas target side isolation isolates the target from both Host and J-Link. This can be desirable in metering applications, as it introduces the least amount of noise from the debug probe to potentially sensitive ADC readings. Host side isolation works with all supported types of debug interfaces, JTAG, SWD (with or w/o SWO), FINE, C2, UART, ... Target side isolation allows High-Speed USB connection (480MBit) with all J-Link models supporting it, but typically limits the maximum speed on the debug interface (target side). Target side isolation options for J-Link are: • JTAG Isolator • SWD Isolator Using USB Isolators from other vendors with J-Link The full J-Link family is designed to work with the J-Link USB Isolator, but may also be used with USB Isolators from other vendors. However; this use is done outside of SEGGER support and done at your own risk! © 2017, www.segger.com, All rights reserved. https://www.segger.com/jlink-usb-isolator.html 4/13/2017