Pull-up, Pull-down, and Keeper

UltraScale Architecture SelectIO Resources User Guide (UG571)

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

I/O buffers (input, output, and bidirectional) support a user programmable option that enables a weak pull-up resistor, a weak pull-down resistor, or a weak keeper circuit.

PULLTYPE attribute has the following possible values:

NONE

PULLUP

PULLDOWN

KEEPER

These attributes use the following syntaxes in the XDC file:

set_property PULLTYPE value [get_ports port_name]