Intel® Quartus® Prime Pro Edition User Guide: Third-party Synthesis

ID 683122
Date 3/28/2022
Public

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2.9.6.3. altera_io_opendrain

Use the altera_io_opendrain attribute to specify open-drain mode I/O ports. This attribute applies a boolean data type value to outputs or bidirectional ports for devices that support open‑drain mode.