13.2.2 Input and Output Signals

The following table lists the input and output ports of Sequence Controller.


Signal Name	Direction	Description
reset_i	Input	Active low asynchronous reset signal to design
sys_clk_i	Input	System clock
fault_i	Input	Active-high-level indicates fault occurrence and forces the FSM to Fault state where motor is stopped. It remains in Fault state unless cleared through fault_clear.
start_motor_i	Input	Rising edge on the signal triggers the FSM to start the motor.
stop_motor_i	Input	Active-high-level on the signal triggers the FSM to go to Stop state and the motor is stopped.
fault_clear_i	Input	Rising edge in this signal clears fault if fault_i is 0 and FSM is released from Fault state to Idle state.
calib_done_i	Input	Active-high-level triggered signal to indicate ADC offset calculation done.
pwm_midmatch_i	Input	Periodic active-high-pulse (1 clock cycle width) that are used to trigger ADC and FOC loop
foc_done_i	Input	Active-high-pulse (1 clock cycle width) indicating completion of FOC loop computations
speed_ref_i	Input	Motor speed reference input
speed_cl_i	Input	Threshold speed value above which the motor operates in closed-loop. Open-loop angle is used if speed is below threshold.
vq_i	Input	Q-axis voltage (IQ PI Output)
max_ar_i	Input	Maximum number of auto-restarts before Fault condition is asserted
config_reg_i	Input	Configuration register. config_reg_i(3): Soft Stop – When 1, enabled; When 0, disabled config_reg_i(2): Startup Mode – When 1, C/f; When 0, V/f config_reg_i(1): Sensor calibration (calibrates sensor to angle 0) config_reg_i(0): Auto restart (when rotor slips) - When 1, enabled; When 0, disabled
adc_start_o	Output	ADC Start signal (active-high-pulse)
cl_status_o	Output	Indicates if motor is in closed-loop (active-high-level) or open-loop.
en_idq_pi_o	Output	Enable signal for current PI controllers
en_pwm_o	Output	Enable signal for three-phase PWM block
motor_stopped_o	Output	Indicates motor stopped/not running (active-high-level)
soft_stop_o	Output	Soft Stop signal (active-high-level) to rate limiter block
sensor_reset_o	Output	Sensor reset signal (active-low-level) activates sensor calibration.
reset_rl_o	Output	Reset rate limiter signal (active-high-level)
state_o	Output	Debug signal indicates the FSM state of the sequence controller.