Reference:
https://github.com/enjoy-digital/litex/wiki/CSR-Bus
CSR is the 2nd best thing in Litex
First is the Build System. (We will talk about it later)
CSR stand for Control Staus Register
If FPGA is a function, CSR is the parameter you pass into the function.
All the CSR can be access through Wishbone Bus system.
And you can access Wishbone Bus from Host
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