Visible to Intel only — GUID: yyu1489537692698
Ixiasoft
Visible to Intel only — GUID: yyu1489537692698
Ixiasoft
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