The ATSAME54MOTOR is an MCU card for Motor control starter kit - ATSAMxxxBDLCxxx-STK. The hardware has the SMART ARM based MCU, ATSAME54, with integrated on-board debug support. The MCU card can be directly used with the currently available ATSAMD21BLDC24V-STK, a low voltage BLDC, PMSM motor control starter kit.
The ATSAMD21BLDC24V Base board can be found here - ATSAMD21BLDC24V-STK
ATSAME54 Motor Control MCU Card