FPGA : Coregenerator Adaptive FIR Filter

Hi

I have used Coregnerator FIR filter in my desing. Initially i have used fixed coefficients, which is stored in BRAM area. and the design is working fine

Now i want to have the flexiility to change the filter coefficient in the BRAM dynamically, but how do i write to that BRAM used by that particular FIR filter ?

(i have one more FIR running in parllalel with fixed coefficients loaded to another BRAM area)

Thanks

bijoy