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.