Memory map?

Hi,

What is memory mapping. If i memory mapped registers in my pheipheral,.
The value written to them is teh value written to memory or it will be
written on physical registers in Pheripheral. Let me explain you cauz i
know my description is bit confusing.....

I have FPGA with a processor. Now i want to connect this processor with
Custom IP (on FPGA) using Processor Local Bus. I know custom IP has
bunch of registers which will recive the data and send the data. These
register i will create and to my understanding they are in pheripheral.
My question is ......

Are these registers really physically there or they are just the map.
SO when Processor will want to write to one of them it will write to
the memory and Pheripheral will knwo something is written to it?

.

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