1.8.2. Delay Elements - The Quartus Prime software does not automatically set delay elements to maximize slack in the I/O timing analysis. To close the timing or maximize slack, set the delay elements manually in the Quartus Prime settings file ( .qsf ). - 2025-12-18

GPIO IP User Guide Arria 10 and Cyclone 10 GX Devices

Version: 25.3

The Quartus^® Prime software does not automatically set delay elements to maximize slack in the I/O timing analysis. To close the timing or maximize slack, set the delay elements manually in the Quartus^® Prime settings file (.qsf).

Table 13. Delay Elements .qsf AssignmentsSpecify these assignments in the .qsf to access the delay elements.
Delay Element	.qsf Assignment
Input Delay Element	`set_instance_assignment –to <PIN> -name INPUT_DELAY_CHAIN <0..63>`
Output Delay Element	`set_instance_assignment –to <PIN> -name OUTPUT_DELAY_CHAIN <0..15>`
Output Enable Delay Element	`set_instance_assignment –to <PIN> -name OE_DELAY_CHAIN <0..15>`