how to create iir filter in vhdl

[chatzstella]

hi evryone i m woking with fpga spartan 3 kit and i need to implement an iir filter with equation y=∑_(k=0)^N[a_k y(n-k)]+∑_(k=0)^M[b_k x(n-k)] but i have problem in creating of this equation in vhdl can you help me?

 

[barry]

What specifically is your problem? You should be able to create a difference equation from your H(s) transfer function, and then implement a bunch of adders and multipliers.

 

[chatzstella]

to an older post there is the iir filter in vhdl with ao,bo be constants and now i want to create an iir filter without constants but summing them in a loop.If someone has worked it i would like to see the way