Interfaces – Altera OCT User Manual
Page 6
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
To I/O Buffers
Series
Termination
Parallel
Termination
RZQ PAD
The following table lists the signals for the interfaces.
Table 2: Signals
Description
Signal 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
ug-altera_oct
Interfaces
6
2013.11.29