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

ID 683796
Date 9/24/2018
Document Table of Contents Preventing the Precision Synthesis Software from Adding an I/O Pad on an Individual Pin

To prevent I/O pad insertion on an individual pin when you are using a black box, such as DDR or a phase-locked loop (PLL), at the external ports of the design, perform the following steps:

  1. Compile your design.
  2. Use the Precision Synthesis GUI to select the individual pin and turn off I/O pad insertion.
Note: You also can make this assignment by attaching the nopad attribute to the port in the HDL source code.