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Modelling External ADC Interface and control system in simulink for Implementing in FPGA

I am developing a control system in simulink that takes in the data from external ADC and executes the control model based on the data. My goal is to use FPGA and the project consists of 2 blocks, 1) ADC acquisition block and 2) Control algorithm block. I completed the control algorithm (fixed point) and everything works fine in simulation. Now in real world, i need to interface to external ADC (AD7606 simultaneous sample), collect 4 channels of data and then feed the control algorithm to get the desired output. Control algorithm runs at 20KHz.