Window minimum step size
| STEPDN | After receiving 2 consecutive good packets the reference window is gradually decremented by step down size until it reaches window minimum. The unit is in microseconds |
| STEPUP | If packets are missed, the reference window is gradually increased by step up size, until it receives 2 consecutive good packets. The unit is in microseconds |
| WINDOW_MIN_FW | Minimum window interval value programmed by firmware. While the slave receive window is decremented, the windows_min_fw sets the lowest value of the window widen value to ensure packets are not missed. The unit is in microseconds. |