IO File
[Hardware resources]

Modules
group	General IO port
group	SREG port
group	SP port
group	RAMPX port
group	RAMPY port
group	RAMPZ port
group	RAMPD port
group	EIND port
group	Peripherals

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Detailed Description

The IO File is composed of a set of discrete registers, that are grouped into a memory-like entity. The IO File has a general write/read port that is byte-oriented, and separate read and write ports for each register in the IO File.

Each IO File register is assigned a unique address in the IO space. That address is defined in the in the constants definition file (`pavr-constants.vhd').
The IO space is placed in the Unified Memory just above the RF, that is, starting with address 32.
The IO addressing space range is 0...63 (Unified Memory addresses 32...95).
Undefined IO registers will read an undefined value.

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