Altera Quartus II Settings File - Manual (Page 440)

AUTO_C3_M9K_BIT_SKIP
Directs the fitter to skip certain bitlines in Cyclone III (including LS) M9K blocks that may be susceptible
to read bit error when used in affected modes. 'Standard' setting will reserve the necessary M9K bitlines to
ensure correct operation for all devices within the selected temperature range. 'Auto' setting applies the
necessary bitline reservation to additional modes (x16/x18) to provide extra margin. 'Maximum' setting
applies the most conservative bitline reservation required for Industrial temperature ranges regardless of
the targeted device settings. Enabling any of these options can increase the number of M9K blocks
required to implement the design. This global setting can be overridden for each memory instance in the
Assignment Editor to customize the solution. Certain RAM modes may not be supported for Commercial
temperature range devices when the 'Standard' or 'Auto' setting is applied. The fitter will issue an error for
these cases. Those RAM cells can be implemented by making an instance assignment with the 'Maximum'
setting, in which case additional M9K blocks may be used. Refer to the Cyclone III M9K Errata
documentation for more details.
Type
Enumeration
Values
• Auto
• MAXIMUM
• Off
• Standard
Device Support
This setting can be used in projects targeting any Altera device family.
Notes
This assignment is included in the Fitter report.
Syntax
set_global_assignment -name AUTO_C3_M9K_BIT_SKIP
Default Value
Off
440 AUTO_C3_M9K_BIT_SKIP
MNL-Q21005
2015.05.04
Altera Corporation Quartus Settings File Reference Manual
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