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AR# 66954

2016.1 Vivado Hardware Manager - Intermittent configuration failures can occur when the FPGA is power cycled and the programming cable is connected.


The following behavior is new to the Vivado 2016.1 Hardware Manager: When a board is powered off or a cable is disconnected, Vivado will close the hardware target in Hardware Manager.

When the board is powered back on or the cable is reconnected, Vivado will now automatically attempt to re-open the hardware target in Hardware Manager.

In addition to reopening the hardware target, Hardware Manager will attempt to refresh all device registers including reading configuration status registers.

Due to this new behavior it is possible to see intermittent configuration failure occur if all of the following are true:

  • Any configuration interface other than JTAG is used
  • Vivado Hardware Manager is open with a programming cable connected
  • Board is power cycled or powered on

If any configuration interface (except JTAG) is used and the JTAG cable is also connected, it is possible that the configuration will be interrupted by the JTAG chain auto detection and/or register reads and will not complete configuration at power up or power cycle.

Please Refer to (UG908) for additional details.


The issue could occur under three conditions:

  1. Device power on or power cycle. Pulsing PROGRAM_B does not result in this issue because the Vivado Hardware Manager does not see a cable disconnection and perform the cable auto detection.
  2. User issues "refresh_hw_devices" command
  3. User plugs in the JTAG cable

Potential Work-arounds include the following:

1) Set the following parameter to disable the power up detection

set_param labtools.auto_update_hardware 0

2) Unplug the cable prior to power up or power cycle.

3) Slow down occurrence of the polling.

For example to poll once an hour, launch hw_server with the following option:

hw_server -e "set jtag-poll-delay 3600000000"

4) Close and reopen the target in JTAG mode as follows to prevent any polling from happening, then restore back to normal mode:

a) Close and reopen the target in JTAG mode:

set tmp_target [ get_hw_targets -filter { IS_OPENED == 1 }]
close_hw_target $tmp_target
open_hw_target -jtag_mode on $tmp_target
set_property LOCK true [get_property  HW_JTAG $tmp_target]

b) Restore back to normal mode once the part has booted:

set_property LOCK false [get_property  HW_JTAG $tmp_target
close_hw_target $tmp_target
open_hw_target $tmp_target
AR# 66954
Date 06/30/2016
Status Active
Type General Article
  • Vivado Design Suite