You can view and change the BSCAN user scan chain index of the debug core hub by selecting the dbg_hub in the Debug window, selecting the Debug Core Options view in the Properties window, changing the value of the C_USER_SCAN_CHAIN property (see the following figure).
Important: The default values for C_USER_SCAN_CHAIN is 1 for the debug hub core. If
using a scan chain value other than 1 for the debug hub core, you must manually change
them on the device in the Hardware Manager. Refer to Programming the Hardware Device for
more details.
Important: If you plan to use the
Microprocessor Debug Module (MDM) or other IP that uses the BSCAN primitive with the Vivado logic debug cores, you need to set the C_USER_SCAN_CHAIN property of the
dbg_hub to a user scan chain that does not conflict
with the other IPs Boundary Scan Chain setting. Failure to do so results in errors later in
the implementation flow.
Figure 1. Changing the User Scan Chain Property of the Debug Core Hub
