
7–4 Chapter 7: Interlaken PHY IP Core
Optional Port Parameters
Altera Transceiver PHY IP Core November 2012 Altera Corporation
User Guide
Optional Port Parameters
Table 7–3 describes the parameters that you can set on the Optional Ports tab.
Analog Parameters
Click on the appropriate link to specify the analog options for your device:
■ Analog Settings for Arria V GZ Devices
■ Analog Settings for Stratix V Devices
PLL type
CMU
ATX
Specifies the PLL type.
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 lane 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.
Base data rate
1 × Lane rate
2 × Lane rate
4 × Lane rate
This option allows you to specify a Base data rate to minimize the
number of PLLs required to generate the clocks necessary for
data transmission at different frequencies. Depending on the Lane
rate you specify, the default Base data rate can be either 1, 2, or 4
times the Lane rate; however, you can change this value. The
default value specified is for backwards compatibility with earlier
Quartus II software releases.
Table 7–2. Interlaken PHY General Options (Part 2 of 2)
Parameter Value Description
Table 7–3. Optional Ports
Parameter Value Description
Enable RX status
signals, (word lock,
sync lock, crc32
error) as part of
rx_parallel_data
On/Off
When you turn this option on,
rx_parallel_data[71:69]
are
included in the top-level module. These optional signals report the
status of word and synchronization locks and CRC32 errors. Refer
to Avalon-ST RX Signals for more information.
Create tx_coreclkin
port
On/Off
The
tx_coreclkin
drives the write side of TX FIFO. This clock is
required for multi-lane synchronization but is optional for single
lane Interlaken links.
If
tx_coreclkin
is deselected for single lane Interlaken links,
tx_user_clkout
drives the TX side of the write FIFO. You must
use the
tx_user_clkout
output port to drive transmit data in the
Interlaken MAC.
Create rx_coreclkin
port
On/Off
When selected
rx_coreclkin
is available as input port which
drives the read side of RX FIFO, When deselected
rx_user_clkout,
rx_clkout
for all bonded receiver lanes, is
routed internally to drive the RX read side of FIFO.
rx_user_clkout
is also available as an output port for the
Interlaken MAC.
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