Verdin Development Board Errata
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Errata #11:
HAR-8833 – The carrier board turns off or resets when a cable is
connected to the USB-C FTDI debug connector
Affected Version:
Verdin Development Board V1.0B
Verdin Development Board V1.1A
Verdin Development Board V1.1B
Fixed in:
Verdin Development Board V1.1C
11.1
Customer impact
The module may reset or turn off, or the carrier board may turn off when a cable is being
connected to the USB-C connector of the FTDI debug port while the board is turned on.
11.2
Description
Due to a race condition between the pull-up voltage at the gates of the transistor level shifters, the
DBG_PWR_BTN#, DBG_FORCE_OFF#, DBG_RESET#, DBG_RECOVERY#, and the
FTDI_JTAG_TRST# signals can get unintentionally triggered when connecting a cable to the USB-C
connector of the FTDI debug port. This may reset or shut down the module or shut down the power
rails of the carrier board.
11.3
Workaround
Connect the cable to the USB-C connector of the FTDI debug port before powering on the carrier
board.
As an alternative solution, the resistors R165, R168, R172, R175, and R319 can be replaced with
resistors having a resistance of 1MOhm. This slows down the transistor level shifter circuits and
makes sure that the power control signals are not triggered when connecting the cable to the USB-
C connector of the FTDI debug port. The same improvement is going to be implemented in future
versions of the product.
