How nios can read and write External FPGAs

[Altera_Forum]

Hi, 

 In my project am using 4 FPGAs   1) First FPGA am using Nios II 2) I want to access/ Control Other FPGA registers  so i have created a custom protocol in slave and master side ir Nios side am planing to do it in C code?  can u tell some ideas of c application how we can start???

[Altera_Forum]

Why do you want to use a custom protocol. Why dont you model the interface as MASTER - SLAVE SPI interface and do a write cycle with address of register and read cycle with teh value of the register.

[Altera_Forum]

User want to access via UART and access all other FPGAs thats why SPI is not using 

      --- Quote Start ---  Why do you want to use a custom protocol. Why dont you model the interface as MASTER - SLAVE SPI interface and do a write cycle with address of register and read cycle with teh value of the register.  --- Quote End ---