Altera® Quartus® Prime Standard Edition Settings File Reference Manual

ID 683084
Date 5/08/2017
Public
Document Table of Contents

1.10.155. GUARANTEE_MIN_DELAY_CORNER_IO_ZERO_HOLD_TIME

Controls whether the fitter tries to achieve a zero hold time for I/O pins that feed globally clocked registers at the fast corner and in stringent operating conditions even if a design does not contain timing assignments. When this option is set to On, the fitter preserves zero hold time for I/O pins feeding globally clocked registers at the fast corner and in stringent operating conditions. This setting may cause violations of tSU or tPD timing constraints. When this option is set to Off, the fitter optimizes a design to meet user timing assignments only. When this option is set to 'When Tsu and Tpd Constraints Permit', the fitter preserves zero hold time for I/O pins feeding globally clocked registers at the fast corner and in stringent operating conditions only if this can be done without violating tSU or tPD timing constraints. This option is useful for automatically meeting I/O hold time requirements in the fast corner without specifying any extra timing constraints.

Type

Enumeration

Values

  • Off
  • On
  • When Tsu and Tpd Constraints Permit

Device Support

  • MAX II
  • MAX V

Notes

This assignment is included in the Fitter report.

Syntax


		set_global_assignment -name GUARANTEE_MIN_DELAY_CORNER_IO_ZERO_HOLD_TIME <value>
	

Default Value

On