3.1.3. I/O AUX
The I/O AUX includes dedicated memory which stores both the calibration algorithm and calibration run-time data. The hardened Nios II processor and the dedicated memory can be used only by an external memory interface, and cannot be employed for any other use. The I/O AUX can interface with soft logic, such as the debug toolkit, via an Avalon® -MM bus.
The I/O AUX is clocked by an on-die oscillator, and therefore does not consume a PLL.
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