Altera Quartus II Settings File - Manual (Page 41)

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
This setting can be used in projects targeting any Altera device family.
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
MNL-Q21005
2015.05.04
AUTO_CARRY_CHAINS 41
Quartus Settings File Reference Manual Altera Corporation
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