Pull-up, Pull-down, and Keeper

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]