Altera SDC and TimeQuest API Manuale Utente Scaricare il pdf (Pagina 41)

Chapter 2: SDC and TimeQuest API Package and Commands 2–31

sdc

The -setup and -hold options allow the false path to only be applied to the corresponding setup/recovery

or hold/removal checks. The default if neither value is specified is to apply the false path to both -setup

and -hold.

The values of the -from, -to, -through, and other similar options are either collections or a Tcl list of

wildcards used to create collections of appropriate types. The values used must follow standard Tcl or

TimeQuest-extension substitution rules. See help for the use_timequest_style_escaping command for

details.

See help for the set_clock_groups command for information.

Example

# Set a false-path between two unrelated clocks

# See also set_clock_groups

set_false_path -from [get_clocks clkA] -to [get_clocks clkB]

# Set a false-path for a specific path

set_false_path -from [get_pins regA|clk] -to [get_pins regB|aclr]

# Set a false-path from a node to a falling clock

set_false_path -from [get_pins regA|clk] -fall_to [get_clocks clkB]

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Altera SDC and TimeQuest API Manuale Utente Pagina 41