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You have to make a OPB wrapper for making a custom peripheral which will communicate with microblaze. XPS has a tool for generating this wrapper. It will give you an interface for your peripheral.
I have not really worked on any of such projects. But to my understanding, you can create your own peripheral using the interface (port-map) provided by the OPB wrapper. You will get clock, din, dout, address etc. signals in that wrapper. Your peripheral will occupy some memory spaces in the OPB address map. You can access your peripheral using the memory assigned to your peripheral from the C-code in microblaze.
If you are using microblaze and OPB wrapper for the first time, u can start with some LED blinking code in your peripheral. It will help you to understand the OPB wrapper and the interface. Once you are capable of establishing communication between microblaze and the peripheral using OPB bus, that too from C-code on microblaze, you can go ahead with more complex functionality in your peripheral.
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