Altera LVDS SERDES Transmitter / Receiver - Manual (Page 19)

Option Description
Use shared PLL(s) for receivers and
transmitters
When you turn on this option, your LVDS receivers and
transmitters can share the same PLL.
Turn on this option when the LVDS receivers and transmitters
use the same input clock frequency, deserialization factor, and
data rates.
Use 'pll_areset' input port Turn on this option to control the asynchronous reset port of
the PLL that the IP core uses with this function.
When other ALTLVDS blocks share the PLL with the receiver
and use the
pll_areset
port, you must use this port in all IP
core instantiations and tie the signals together in the design file.
If you use the
pll_areset
port only in one IP core instance,
the PLLs are not shared, and a warning appears during
compilation.
The PLL must be reset to set the output clock phase relation‐
ships correctly when the PLL loses lock, or if the PLL input
reference clock is not stable when the device completes the
configuration process.
Use 'rx_pll_enable' input port Turn on this option to control the enable port of the fast PLL
that the IP core uses with this function.
If the receiver shares the PLL with other ALTLVDS blocks, and
uses the
rx_pll_enable
port, you must use this port in all IP
core instances and tie the signal together in the design file. If
you use the
rx_pll_enable
port only in one IP core instance,
the PLLs are not shared and a warning appears during compila‐
tion.
Use 'rx_locked' output port Turn on this option to monitor the lock status of the PLL. The
status of the lock port is identical for the transmitter and the
receiver when the IP cores use shared PLLs. In this case,
monitor the lock output from the receiver IP core.
What is the clock resource used for 'rx_
outclock'?
Specifies the clock resource type fed from the
rx_outclock
port. Legal values are Auto selection (the Compiler determines
the type), Global clock, and Regional clock.
The default value is Auto selection.
What is the phase alignment of 'rx_in'
with respect to 'rx_inclock'?
Determines the phase alignment of the data that the receiver
core receives with respect to the rx_inclock signal.
Available values are 0.00, 22.50, 45.00, 67.50, 90.00, 112.50,
135.00, 157.50, 180.00, 202.50, 225.00, 247.50, 270.00, 292.50,
315.00, and 337.50.
The values for this option are device dependent.
This option is only available if you turn off the DPA mode.
UG-MF9504
2014.12.15
ALTLVDS_RX Parameter Settings 19
LVDS SERDES Transmitter/Receiver IP Cores User Guide Altera Corporation
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