General Information - 2021.1 English

Vivado Design Suite User Guide Programming and Debugging (UG908)

Document ID
UG908
Release Date
2021-06-16
Version
2021.1 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.