General Information - 2023.2 English

Vivado Design Suite User Guide: Programming and Debugging (UG908)

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2023.2 English

The scan_dr_hw_jtag command specifies a scan pattern to be scanned into the JTAG interface target data register. The command targets a hw_jtag object which is created when the hw_target is opened in JTAG mode through the use of the open_hw_target -jtag_mode command. When targeting the hw_jtag object prior to shifting the scan pattern specified in the scan_dr_hw_jtag command, the last defined header property (HDR) is pre-pended to the beginning of the specified data pattern. The last defined trailer property (TDR) is appended to the end of the data pattern.

The scan_dr_hw_jtag command returns a hex array containing captured TDO data from the hw_jtag, or returns an error if it fails.