Q: Where can I find the pin-out of the Digilent Motor / Gearbox (MT-MOTOR) 6-pin connector?
Digilent Motor / Gearbox (MT-MOTOR) pin's
http://www.digilentinc.com/Products/Detail.cfm?NavPath=2,403,625&Prod=MT-MOTOR
are designed to map directly onto Digilent PmodHB5:
http://www.digilentinc.com/Products/Detail.cfm?NavPath=2,401,503&Prod=PMOD-HB5
Further information on the motor can be found in the document for that Pmod.
The pins are Motor Power +, Motor Power -, Gnd, Vcc (3.3v), and two feedback lines from the motor.