Dual-Purpose Pins Page (Device and Pin Options Dialog Box)
Specifies whether the associated dual-purpose pin,
nCSO, or other active parallel pins, including,
RDY, is reserved, and the purpose for which it is reserved, as
indicated with the following options:
- Use as regular I/O—The dual-purpose pin is not reserved; instead, it is used as an I/O pin in user mode.
- Use as
nCEOpin can be used as a dedicated programming pin. This option is available only for CycloneIII, and CycloneIV family devices.
- As input tri-stated—Thedual-purpose pin is reserved as an input pin.
- As output driving ground—The dual-purpose pin is reserved as an output pin and drives the ground signal.
- As output driving an unspecified signal—The dual-purpose pin is reserved as an output pin and drives any signal.
- Compiler configured—The Compiler automatically selects the best reserve setting for the dual-purpose pin, considering the configuration scheme specified on the Configuration page, and if the pins are only used for configuration. If your design uses the Active Parallel configuration scheme and the Programmer does not communicate directly with the parallel flash device in user mode, you should reserve all dual-purpose pins connected to the parallel flash device as Compiler configured.
ASDOpin is also controlled by the
reserve_data1_after_configurationkeyword for Cyclone III and Cyclone IV devices.