The advanced differential termination (DIFF_TERM_ADV) property is intended for use with UltraScale architecture only, and is used to enable or disable the built-in, 100Ω, differential termination for inputs or bidirectional ports. DIFF_TERM_ADV indicates a differential termination method should be used on differential input and bidirectional port buffers, and that the Vivado Design Suite should add on-chip termination to the port.
DIFF_TERM_ADV is only available for inputs and bidirectional ports and can only be used with the appropriate VCCO voltage. The VCCO of the I/O bank must be connected to 1.8V for HP I/O banks, and 2.5V for HR I/O banks to provide 100Ω of effective differential termination. Refer to the UltraScale Architecture SelectIO Resources User Guide (UG571) for more information.
- Architecture Support
- UltraScale devices.
- Applicable Objects
- Ports (get_ports)
- Input or bidirectional ports connected to a differential input buffer
- Applicable to objects using one of the following
- LVDS, LVDS_25, MINI_LVDS_25, SUB_LVDS
- SLVS_400_25, and SLVS_400_18
- Ports (get_ports)
- Utilize the 100Ω on-chip differential termination.
- Do not utilize the on-chip differential
termination (default).Note: The TERM_NONE value is the default value when the DIFF_TERM_ADV property is valid, such as for supported IOSTANDARDs and voltage levels. However, where it is not supported, it should not be specified and DIFF_TERM_ADV=TERM_NONE can result in a DRC violation. In these cases you can set the property to a NULL value using one of the following commands:
reset_proeprty DIFF_TERM_ADV [get_ports <port_name>] -or- set_property DIFF_TERM_ADV "" [get_ports <port_name>]
- Verilog Syntax
- VHDL Syntax
- XDC Syntax
set_property DIFF_TERM_ADV TERM_100 [get_ports <port_name>]
set_propertyDIFF_TERM_ADV can be assigned to input or bidirectional ports.
port_nameis an input or bidirectional port connected to a differential buffer.
XDC Syntax Example:
# Enables differential termination on port named CLK_p set_property DIFF_TERM_ADV TERM_100 [get_ports CLK_p]
- I/O Planning