【vivado】XDC约束

# ----------------------------------------------------------------------------
# IOSTANDARD Constraints
#
# Note that these IOSTANDARD constraints are applied to all IOs currently
# assigned within an I/O bank. If these IOSTANDARD constraints are
# evaluated prior to other PACKAGE_PIN constraints being applied, then
# the IOSTANDARD specified will likely not be applied properly to those
# pins. Therefore, bank wide IOSTANDARD constraints should be placed
# within the XDC file in a location that is evaluated AFTER all
# PACKAGE_PIN constraints within the target bank have been evaluated.
#
# Un-comment one or more of the following IOSTANDARD constraints according to
# the bank pin assignments that are required within a design.
# ----------------------------------------------------------------------------

# Note that the bank voltage for IO Bank 33 is fixed to 3.3V on ZedBoard.
set_property IOSTANDARD LVCMOS33 [get_ports -of_objects [get_iobanks 33]];

# Set the bank voltage for IO Bank 34 to 1.8V by default.
# set_property IOSTANDARD LVCMOS33 [get_ports -of_objects [get_iobanks 34]];
# set_property IOSTANDARD LVCMOS25 [get_ports -of_objects [get_iobanks 34]];
set_property IOSTANDARD LVCMOS18 [get_ports -of_objects [get_iobanks 34]];

# Set the bank voltage for IO Bank 35 to 1.8V by default.
# set_property IOSTANDARD LVCMOS33 [get_ports -of_objects [get_iobanks 35]];
# set_property IOSTANDARD LVCMOS25 [get_ports -of_objects [get_iobanks 35]];
set_property IOSTANDARD LVCMOS18 [get_ports -of_objects [get_iobanks 35]];

# Note that the bank voltage for IO Bank 13 is fixed to 3.3V on ZedBoard.
set_property IOSTANDARD LVCMOS33 [get_ports -of_objects [get_iobanks 13]];

请注意，IOSTANDARD语段一定要放在PACKAGE_PIN语段之后，否则会error。