How to implement a code that uses floating-point?

Hello, How should I do to implement in VHDL, a code that calculates the following equation: u(k) = 622,5u(k-1) + 0,6279u(k-2) + 651,2e(k) + 0,000814e(k-1) - 651,2e(k-2). I am a beginner in VHDL and d...