SLVSE89C August 2017 – June 2020 DRV10987
If software current limit and AVS are enabled, the PWM duty cycle output (read back at spdCmdBuffer) may not always match the input command (read back at SpeedCmd) shown in Figure 44. See Anti-Voltage Surge Function and Current Limits.
By reading the value of spdCmdBuffer, the user can observe buffered speed command (output PWM duty cycle) to the motor.
Equation 15 shows how the buffered speed is calculated.