MSR EEE (Magnetic Stripe Reader End to End Encryption) Implementation

This is a brief article about the SPI communication that I implemented, between the FPGA and the MSR EEE chip. 

3 registers were defined
·         msr_data_reg – 8 bit register
       Used to store data to be written to the device and read from the device
·         msr_control_reg - 8 bit register
       Used to store control information. Used three bits of the register .
       0^th bit – write bit
       1^st bit – read bit
       2^nd bit – chip select bit
·         msr_status_reg – 8 bit register
      Used to store the status of the device. (To check data availability) When data are available, DAV pin of
      the MSR chip goes to logic high.