User guide

Chapter 3: 10GBASE-R PHY IP Core 3–5
Parameter Settings
March 2012 Altera Corporation Altera Transceiver PHY IP Core
User Guide
Analog Options
The following sections explain how to specify analog options for Stratix IV and
Stratix V devices.
Stratix IV Devices
For Stratix IV devices, you specify analog options on the Analog Options tab.
Table 3–6 describes these options.
PLL type
CMU
ATX
You can select either the CMU or ATX PLL. The CMU PLL has a larger
frequency range than the ATX PLL. The ATX PLL is designed to
improve jitter performance and achieves lower channel-to-channel
skew; however, it supports a narrower range of data rates and
reference clock frequencies. Another advantage of the ATX PLL is
that it does not use a transceiver channel, while the CMU PLL does.
Because the CMU PLL is more versatile, it is specified as the default
setting. An informational message displays in the message pane
telling you whether the chosen settings for Data rate and Input clock
frequency are legal for the CMU PLL, or for both the CMU and ATX
PLLs.
Reference Clock Frequency
322.265625 MHz
644.53125 MHz
Stratix V devices support both frequencies. Stratix IV GX devices
only support 644.53125 MHz.
Additional Options
Use external PMA control and
reconfig
On/Off
For Stratix IV devices, if you turn this option on, the PMA controller
and reconfiguration block are external, rather than included
10GBASE-R PHY IP core, allowing you to use the same PMA
controller and reconfiguration IP cores for other protocols in the
same transceiver quad.
When you turn this option On, the
cal_blk_powerdown (0x021)
and
pma_tx_pll_is_locked (0x022) registers are available.
Enable additional control and
status pins
On/Off
If you turn this option on, the following 2 signals are brought out to
the top level of the IP core to facilitate debugging:
hi_ber and
block_lock .
Enable rx_recovered_clk pin On/Off
When you turn this option on, the RX recovered clock signal is an
output signal.
Starting channel number 0–96
For Stratix IV devices, specifies the starting channel number. Must be
0 or a multiple of 4. You only need to set this parameter if you are
using external PMA and reconfiguration modules. This option is only
necessary for Stratix IV devices.
Table 3–5. General Options (Part 2 of 2)
Name Value Description
Table 3–6. 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.