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Interfaces

The Altera OCT megafunction has two main interfaces:

• An input interface directly connected from the FPGA RZQ pad.

• Two 16-bit words output which will connect to I/O buffers.

Figure 5: Altera OCT Interfaces

Altera OCT

To I/O Buffers

Series

Termination

Parallel

Termination

RZQ PAD

The following table lists the signals for the interfaces.

Table 2: Signals

DescriptionSignal Name

Input connection from RZQ pad to the OCT block. RZQ

pad is connected to an external resistance.

OCT uses impedance connected to the rzqin port as a

reference to generate the calibration code.

rzqin

Output connection from the Altera OCT megafunction to

the I/O buffers.

This is a 16-bit calibration code word which will terminate

an output signal and the I/O buffer.

You must connect the series_termination port to

the seriesterminationcontrol port in the input

or output buffer.

series_termination[15:0]

Output connection from the Altera OCT megafunction to

the I/O buffers.

This is a 16-bit calibration code word which will terminate

an input signal and the I/O buffer.

You must connect the parallel_termination port

to the parallelterminationcontrol port in the

input or output buffer.

parallel_termination[15:0]

Altera OCT Megafunction User Guide

Altera Corporation

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Interfaces

2013.11.29

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Altera OCT Bedienungsanleitung Seite 6