Altera Quartus II Scripting - Manual (Page 62)

2–36 Chapter 2: Command-line Executables
quartus_fit
Quartus II Scripting Reference Manual © July 2013 Altera Corporation
The following table describes level of effort values:
--fmax=<time unit>
Option to specify the fmax time value.
Fmax is the minimum acceptable clock frequency, that is, the maximum clock frequency that can be
achieved without violating internal setup and hold time requirements.
Example usage:
quartus_fit one_wire --fmax=155.55mhz
The format is "<floating point time value><time unit>". In this example, "155.55" is the <floating point
time value> and "mhz" is the <time unit>.
The following table displays possible time units:
--incremental_signaltap
Option to perform an incremental SignalTap ® II compilation. Use this option when only SignalTap settings
have changed since the last compilation.
This option cannot be used with most of the other quartus_fit options.
--inner_num=<value>
Option to specify a value for the loop multiplier "inner_num" used during placement. Analysis &
Synthesis (quartus_map) must be run successfully before you use this option. Use of a higher value
increases compilation time, but may increase the quality of placement.
Value Description
standard Directs the Fitter not to decrease effort. Preserves fmax but does not decrease
compilation time.
fast Directs the Fitter to decrease effort. Decreases compilation time by up to 50%, with a
possible reduction in fmax.
auto Directs the Fitter to reduce effort after meeting timing requirements. Decreases
compilation time only when timing and fitting requirements can be met.
Time Unit Description
s second(s)
ms millisecond(s)
us microsecond(s)
ns nanosecond(s)
ps picosecond(s)
fs femtosecond(s)
hz hertz
khz kilohertz
mhz megahertz
ghz gigahertz