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The base addresses of the CTIs are not fixed, and can be different for any particular system implementation. However, the offset of any particular register from the base address is fixed.
The following locations are reserved for future possible expansion and must not be used during normal operation:
0x040-0x09C
0x0C0-0x12C.
The following applies to all registers:
reserved or unused bits of registers must be written as 0, and ignored on a read unless otherwise stated in the text
all register bits are reset to 0 unless otherwise stated in the text
all registers must be accessed as words and so are compatible with big and little endian systems.