Quartus II Settings File Reference Manual - Altera

Chapter 4: Analysis & Synthesis Assignments 4–165
STRATIX_CARRY_CHAIN_LENGTH
STRATIX_CARRY_CHAIN_LENGTH
Type
Specifies the maximum allowable length of a chain of both user-entered and
Compiler-synthesized CARRY_SUM buffers. Carry chains that exceed this length are
broken into separate chains. This option also applies to MAX+PLUS II-style CARRY
buffers.
Integer
Device Support
This setting can be used in projects targeting the following device families:
■ Cyclone
■ Cyclone II
■ Cyclone III
■ Cyclone III LS
■ Cyclone IV E
■ Cyclone IV GX
■ MAX II
■ MAX V
■ Stratix
■ Stratix GX
Notes
This assignment is included in the Analysis & Synthesis report.
Syntax
set_global_assignment -name STRATIX_CARRY_CHAIN_LENGTH
set_global_assignment -name STRATIX_CARRY_CHAIN_LENGTH -entity
set_instance_assignment -name STRATIX_CARRY_CHAIN_LENGTH -to -entity
Default Value
70
Old Names
This variable also has the following name(s) in some earlier versions of the Quartus II
software:
Carry Chain Length -- Stratix/Stratix GX/Cyclone/MAX II/Cyclone II/Cyclone III
June 2012 Altera Corporation Quartus Settings File
Reference Manual