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EMIF Asynchronous read and write

 

I'm working with EVM5515 / DSP 5504 and I need to implemented the read and write function to NOR external flash via EMIF

For Read I have to set the address in EM_A[20:0] pins and for write I need to set the address in  EM_A[20:0] pins and  the data in EM_D[0:15] pins

I'm using CCS3 . how can I get access to those pins . is there any registers that I need to set the data into insted of writing directly into those I/Os?