Visible to Intel only — GUID: fjl1489537745167
Ixiasoft
Visible to Intel only — GUID: fjl1489537745167
Ixiasoft
1.2.142. SYNCHRONIZATION_REGISTER_CHAIN_LENGTH
This setting specifies the maximum number of registers in a row to be considered as a synchronization chain. Synchronization chains are sequences of registers with the same clock, no fanout in between, such that the first register is fed by a pin, or by logic in another clock domain. These registers will be considered for metastability analysis (available for some families), and are also protected from optimizations such as retiming. When gate-level retiming is turned on, these registers will not be moved. The default length is device-specific.
Old Name
ADV_NETLIST_OPT_METASTABLE_REGS
Type
Integer
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
- HardCopy II
- HardCopy III
- HardCopy IV
- MAX 10
- MAX II
- MAX V
- 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 SYNCHRONIZATION_REGISTER_CHAIN_LENGTH <value>
set_global_assignment -name SYNCHRONIZATION_REGISTER_CHAIN_LENGTH -entity <entity name> <value>
set_instance_assignment -name SYNCHRONIZATION_REGISTER_CHAIN_LENGTH -to <to> -entity <entity name> <value>