ALT_BIDIR_BUF Primitive
The ALT_BIDIR_BUF primitive allows you to make low-level assignments with the altddio_bidir Intel® FPGA IP. This primitive allows you to do the following:
- Make a location assignment
- Make an I/O standards Definition assignment
- Make a drive strength (current strength) assignment
- Make a slew rate assignment to the bidirectional pin connected to the altddio_bidir Intel® FPGA IP
- Make an on-chip termination assignment
- Enable bus hold circuitry
- Enable weak pull up resistor
This primitive is available for CycloneIII and StratixIII devices only.
The ALT_BIDIR_BUF primitive is not supported by AHDL.
Note:
- This primitive can be used only with an altddio_bidir Intel® FPGA IP.
- Trying to set other parameters not listed in the Parameters table on the ALT_BIDIR_BUF primitive results in errors.
- For information about Intel® Quartus® Prime primitive instantiation, see Using a Intel® Quartus® Prime Logic Function.