Quartus® Prime Pro Edition Settings File Reference Manual

ID 683296
Date 4/01/2024
Public
Document Table of Contents

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

  • Intel Agilex® 5
  • Intel Agilex® 7
  • Arria® 10
  • Cyclone® 10 GX
  • Stratix® 10

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>