Quartus II Settings File Reference Manual - Altera

6–186 Chapter 6: Fitter Assignments
IO_STANDARD
IO_STANDARD
Type
Specifies the I/O standard of a pin. Different device families support different I/O
standards, and restrictions apply to placing pins with different I/O standards
together. For more information, refer to the respective device family data sheet. This
option is ignored if it is applied to anything other than a pin or a top-level design
entity.
This option specifies an I/O standard of a pin. If a pin does not have this option, the
Quartus II software automatically assigns an I/O standard to the pin, based on the
global device option STRATIX_DEVICE_IO_STANDARD (or its device value), or
derived from the netlist (for example, using differential output buffer implies that
differential I/O standard is used). You should specify this option explicitly because
I/O standard affects placement, timing and power. This option also implies what
other I/O options are supported such as current strength, slew rate, termination, preemphasis
and VOD. This option is always honored.
String
Device Support
This setting can be used in projects targeting the following device families:
■ Arria GX
■ Arria II GX
■ Arria II GZ
■ Arria V
■ Cyclone
■ Cyclone II
■ Cyclone III
■ Cyclone III LS
■ Cyclone IV E
■ Cyclone IV GX
■ Cyclone V
■ HardCopy II
■ HardCopy III
■ HardCopy IV
■ MAX II
■ MAX V
■ MAX7000B
■ Stratix
■ Stratix GX
Quartus Settings File June 2012 Altera Corporation
Reference Manual