DRV8308: DRV8308 IC Speed Control with SPDMODE 0

Part Number:DRV8308

Hi,

I'm using DRV8308 and drive a motor which is THOMAS 600490F. I drive it with SPDMODE 1 and it work well but i want to drive it with SPDMODE 0 with speed control. I drive it without speed control. Which register should i change?