Altera Quartus II Settings File - Manual (Page 58)

AUTO_SHIFT_REGISTER_RECOGNITION
Allows the Compiler to find a group of shift registers of the same length that can be replaced with the
altshift_taps megafunction. The shift registers must all use the same clock and clock enable signals, must
not have any other secondary signals, and must have equally spaced taps that are at least three registers
apart.
Type
Enumeration
Values
• Always
• Auto
• Off
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 AUTO_SHIFT_REGISTER_RECOGNITION <value>
set_global_assignment -name AUTO_SHIFT_REGISTER_RECOGNITION -entity <entity
name> <value>
set_instance_assignment -name AUTO_SHIFT_REGISTER_RECOGNITION -to <to> -
entity <entity name> <value>
Default Value
Auto
Example
set_global_assignment -name auto_shift_register_recognition off
set_instance_assignment -name auto_shift_register_recognition off -to foo
58 AUTO_SHIFT_REGISTER_RECOGNITION
MNL-Q21005
2015.05.04
Altera Corporation Quartus Settings File Reference Manual
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