Altera Quartus II Settings File - Manual (Page 131)

MERCURY_CARRY_CHAIN_LENGTH
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.)
Old Name
Carry Chain Length -- Mercury
Type
Integer
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 MERCURY_CARRY_CHAIN_LENGTH <value>
set_global_assignment -name MERCURY_CARRY_CHAIN_LENGTH -entity <entity
name> <value>
set_instance_assignment -name MERCURY_CARRY_CHAIN_LENGTH -to <to> -entity
<entity name> <value>
Default Value
48
MNL-Q21005
2015.05.04
MERCURY_CARRY_CHAIN_LENGTH 131
Quartus Settings File Reference Manual Altera Corporation
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