User guide

4–4 Chapter 4: XAUI PHY IP Core
Parameter Settings
Altera Transceiver PHY IP Core March 2012 Altera Corporation
User Guide
Analog Options
The following sections explain how to specify analog options for supported device
families.
Arria II GX, Cyclone IV GX, HardCopy IV and Stratix IV Devices
Arria II GX, Cyclone IV GX, and Stratix IV devices, you specify analog options on the
Analog Options tab. Table 4–5 describes these options.
Base data rate
1 × Lane rate
2 × Lane rate
4 × Lane rate
The base data rate is the frequency of the clock input to the PLL.
Select a base data rate that minimizes the number of PLLs required
to generate all the clock s required for data transmission. By
selecting an appropriate base data rate, you can change data rates
by changing the divider used by the clock generation block. This
parameter is available for Stratix V devices.
Number of XAUI interfaces 1
Specifies the number of XAUI interfaces. Only 1 is available in the
current release.
Table 4–4. General Options (Part 2 of 2)
Name Value Description
Table 4–5. PMA Analog Options (Part 1 of 2)
Name Value Description
Transmitter termination
resistance
OCT_85_OHMS
OCT_100_OHMS
OCT_120_OHMS
OCT_150_OHMS
Indicates the value of the termination resistor for the transmitter.
Transmitter VOD control setting 0–7 Sets V
OD
for the various TX buffers.
Pre-emphasis pre-tap setting 0–7
Sets the amount of pre-emphasis on the TX buffer. Available for
Stratix IV
Invert the pre-emphasis pre-tap
polarity setting
On
Off
Determines whether or not the pre-emphasis control signal for the
pre-tap is inverted. If you turn this option on, the pre-emphasis
control signal is inverted. Available for HardCopy IV and Stratix IV
devices.
Pre-emphasis first post-tap
setting
0–15 Sets the amount of pre-emphasis for the 1st post-tap.
Pre-emphasis second post-t ap
setting
0–7
Sets the amount of pre-emphasis for the 2nd post-tap. Available
for HardCopy IV and Stratix IV devices.
Invert the pre-emphasis second
post-tap polarity
On
Off
Determines whether or not the pre-emphasis control signal for the
second post-tap is inverted. If you turn this option on, the
pre-emphasis control signa is inverted. Available for HardCopy IV
and Stratix IV devices.
Receiver common mode voltage
Tri-state
0.82V
1.1v
Specifies the RX common mode voltage.
Receiver t
ermination resistance
OCT_85_OHMS
OCT_100_OHMS
OCT_120_OHMS
OCT_150_OHMS
Indicates the value of the termination resistor for the receiver.
Cyclone IV supports 100 and 150.