Source Termination Attribute (OUTPUT_IMPEDANCE)

UltraScale Architecture SelectIO Resources User Guide (UG571)

Document ID
UG571
Release Date
2023-08-31
Revision
1.15 English

The OUTPUT_IMPEDANCE attribute provides the option of choosing the driver impedance for HSTL, SSTL, HSUL, LVDCI, HSLVDCI, and POD drivers to match the characteristic impedance of the driven line. The OUTPUT_IMPEDANCE attribute is used to define the value of source termination at the driver for both DCI and non-DCI versions of the standards supported.

Allowed values for the OUTPUT_IMPEDANCE attribute:

RDRV_40_40

RDRV_48_48

RDRV_60_60

RDRV_NONE_NONE

Note: Not all values are allowed for all applicable I/O standards and configurations.

The XDC syntax for this attribute is:

set_property OUTPUT_IMPEDANCE value [get_ports port_name ]