12.2.2 Input and Output Signals

The following table lists the input and output ports of Resolver interface.

Table 12-3. Inputs and Outputs of Resolver Interface
Signal Name	Direction	Description
reset_i	Input	Active low asynchronous reset signal to design
sys_clk_i	Input	System clock
clear_buffer_i	Input	When set to 1, internal speed filter buffer is cleared When set to 0, buffer is normally operated
calib_angle_i	Input	The IP enters calibration state when this signal goes high. The angle offset between the resolver zero and the motor magnetic zero is calculated in this state.
direction_config_i	Input	Specifies the direction of motor rotation
pp_ratio_i	Input	The ratio of number of motor poles to number of resolver poles expressed as exponent of 2. Example for motor poles 16, resolver poles 2, pp_ratio_i = 3; For motor poles 8, resolver poles 2, pp_ratio_i= 2; For motor poles 4, resolver poles 4, pp_ratio_i = 0.
cos_i	Input	Cosine winding input (from ADC)
sin_i	Input	Sine winding input (from ADC)
pll_pi_kp_i	Input	Proportional gain of PI controller used for PLL
pll_pi_ki_i	Input	Integral gain of PI controller used for PLL
dc_filter_factor	Input	Filter time constant of high-pass filter used to eliminate DC value from Sine and Cosine signals
ac_filter_factor	Input	Filter time constant of low-pass filter used to eliminate modulation wave frequency component for Sine and Cosine signals
theta_factor_i	Input	Theta factor constant, as calculated from EQ1
hf_sig_period_i	Input	Half the value of the high frequency square wave time period, as calculated from EQ2
hf_signal_o	Output	Square wave signal used to drive primary winding of resolver
theta_o	Output	Angle output of resolver; equivalent to motor electrical angle
speed_o	Output	Speed output of resolver IP