On-Die Termination (ODT) Attribute

UltraScale Architecture SelectIO Resources User Guide (UG571)

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

The ODT attribute supports split or single termination on the inputs of the HSTL, SSTL, POD, and HSUL standards. The advantage of using ODT over discrete resistors is that signal integrity is improved by completely removing the stub at the receiver.

The ODT attribute is used to define the value of the on-die termination at the input for both DCI and non-DCI versions of the standards supported.

The V CCO of the I/O bank must be connected to the appropriate voltage level for the ODT attribute to perform as expected.

Note: For additional information, see Table: VCCO and VREF Requirements for Each Supported I/O Standard in Rules for Combining I/O Standards in the Same Bank for the V CCO levels required for I/O standards.

Allowed values for the ODT attribute:

RTT_40

RTT_48

RTT_60

RTT_120

RTT_240

RTT_NONE

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

The ODT attribute uses the following syntax in the XDC file:

set_property ODT value [get_ports port_name ]