What is VHDL program for FSK modulation?

VHDL (VHSIC Hardware Description Language) can be used to implement Frequency Shift Keying (FSK) modulation by creating a module that generates two distinct frequencies corresponding to binary '0' and '1'. The design typically involves a clock signal to synchronize the output and a binary input signal to determine which frequency to output. The output can be produced using a frequency generator or a phase-locked loop (PLL) that switches between the two frequencies based on the input data. Additionally, you may include a finite state machine (FSM) to manage the state transitions based on the input signal.