Altera® Quartus® Prime Standard Edition Settings File Reference Manual

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

1.10.9. AUTO_C3_M9K_BIT_SKIP

Directs the fitter to skip certain bitlines in Cyclone III (including LS) M9K blocks that may be susceptible to read bit error when used in affected modes. 'Standard' setting will reserve the necessary M9K bitlines to ensure correct operation for all devices within the selected temperature range. 'Auto' setting applies the necessary bitline reservation to additional modes (x16/x18) to provide extra margin. 'Maximum' setting applies the most conservative bitline reservation required for Industrial temperature ranges regardless of the targeted device settings. Enabling any of these options can increase the number of M9K blocks required to implement the design. This global setting can be overridden for each memory instance in the Assignment Editor to customize the solution. Certain RAM modes may not be supported for Commercial temperature range devices when the 'Standard' or 'Auto' setting is applied. The fitter will issue an error for these cases. Those RAM cells can be implemented by making an instance assignment with the 'Maximum' setting, in which case additional M9K blocks may be used. Refer to the Cyclone III M9K Errata documentation for more details.

Type

Enumeration

Values

  • Auto
  • MAXIMUM
  • Off
  • Standard

Device Support

  • Cyclone III
  • Cyclone III LS

Notes

This assignment is included in the Fitter report.

Syntax


		set_global_assignment -name AUTO_C3_M9K_BIT_SKIP <value>
	

Default Value

Off