9.2.2 Input and Output Signals

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

Table 9-3. Inputs and Outputs of PI Controller
Signal Name	Direction	Description
reset_i	Input	Asynchronous reset signal (default is active low)
sys_clk_i	Input	System clock
ref_input_i	Input	Reference input to be tracked
act_input_i	Input	Input from feedback measurement/quantity
start_i	Input	Start signal to trigger the FSM on the signal's rising edge; to initiate the PI Controller algorithm.
kp_i	Input	Proportional gain value input
ki_i	Input	Integral gain value input
ymin_i	Input	Input representing the minimum allowable output value
ymax_i	Input	Input representing the maximum allowable output value
init_i	Input	The initial output value when the PI Controller is not enabled
pi_en_i	Input	When set to 1, the PI Controller functionality is enabled. When set to 0, the PI Controller functionality is disabled, and the input value in the init port will be available at the output.
done_o	Output	Done signal, which is asserted for one clock cycle when computations are completed and output of PI Controller is available
output_y_o	Output	Output of the PI Controller