on the data sheet, figure 4, it says the ENA & ENB must be externally pulled up. And that is how it's done on Pololu's motor driver board. All I've ever worked with previously is the L293D. I usually pulled the enable pin low with a 10K, and then used a 330ohm from a digital pin on my Arduino to pull it high. This would prevent the motor from running briefly at power up. Can I do this same thing with these ENA & ENB pins to keep this motor driver from running at startup?
Pololu motor driver board schematic:http://www.pololu.com/catalog/product/706/resources