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How to drive Bipolar stepper motor using MTD2006 dual H-bridge

Hi

I'm trying to drive a Bi-polar stepper motor using MTD2006 bridge which I got from old copy machine.But when I download datasheet for this IC found that input signals must fed to drive the motor (ENA A,PHY A,ENA B,PHY B ) As I understand ENA signal must be (High) always! So I'm confused how to drive this IC using Arduino?

Thanks