Altera® Quartus® Prime Standard Edition Settings File Reference Manual

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

1.2.11. AUTO_CARRY_CHAINS

Allows the Compiler to create carry chains automatically by inserting CARRY_SUM buffers into the design. This option is also required to recognize carry chains in any design containing MAX+PLUS II-style CARRY buffers. The length of the chains is controlled with the Carry Chain Length option. If this option is turned off, CARRY buffers are ignored, but CARRY_SUM buffers are unaffected. The Auto Carry Chains option is ignored if you select 'Product Term' or 'ROM' as the setting for the Technology Mapper option.

Type

Boolean

Device Support

  • Arria 10
  • Arria GX
  • Arria II GX
  • Arria II GZ
  • Arria V
  • Arria V GZ
  • Cyclone
  • Cyclone 10 LP
  • Cyclone II
  • Cyclone III
  • Cyclone III LS
  • Cyclone IV E
  • Cyclone IV GX
  • Cyclone V
  • A
  • E
  • HardCopy II
  • HardCopy III
  • HardCopy IV
  • MAX 10
  • MAX II
  • MAX V
  • Mercury
  • Stratix
  • Stratix GX
  • Stratix II
  • Stratix II GX
  • Stratix III
  • Stratix IV
  • Stratix V

Notes

This assignment is included in the Analysis & Synthesis report.

This assignment supports synthesis wildcards.

Syntax


		set_global_assignment -name AUTO_CARRY_CHAINS <value>
		set_global_assignment -name AUTO_CARRY_CHAINS -entity <entity name> <value>
		set_instance_assignment -name AUTO_CARRY_CHAINS -to <to> -entity <entity name> <value>
	

Default Value

On