Quartus II Settings File Reference Manual - Altera

6–188 Chapter 6: Fitter Assignments
LVDS_DIRECT_LOOPBACK_MODE
LVDS_DIRECT_LOOPBACK_MODE
Type
Enable the LVDS Direct Loop Mode on a True Differential output pin. This assignment
should only apply from an input pin to an output pin and both of them should have
True Differential I/O standard. When this feature is enabled, data coming in from the
adjacent RX pair gets looped back to the TX pair. This feature can be used to verify the
Tx and Rx buffer by checking the data transmit and received. This option is ignored if
it is applied to anything other than a pin or a top-level design entity.
Boolean
Device Support
This setting can be used in projects targeting the following device families:
■ Arria V
■ Cyclone V
■ Stratix V
Notes
This assignment supports wildcards.
This assignment is included in the Fitter report.
Syntax
set_instance_assignment -name LVDS_DIRECT_LOOPBACK_MODE -from -to
-entity
Example
set_instance_assignment -name LVDS_DIRECT_LOOPBACK_MODE ON -from
true_diff_in_pin_p -to true_diff_out_pin_p
See Also
■ “IO_STANDARD” on page 6–186
Quartus Settings File June 2012 Altera Corporation
Reference Manual