set_timing_derate (::quartus::sdc

Tcl Package and Version

Syntax

set_timing_derate [-h | -help] [-long_help] [-cell_delay] [-early] [-late] [-net_delay] [-operating_conditions <operating_conditions> ] <derate_value> [ <cells> ]

Arguments

-h | -help

Short help

-long_help

Long help with examples and possible return values

-cell_delay

Specifies that derating factors are only to apply to cell delays

-early

Specifies the minimum derating factor. This factor specifies how early the signal can arrive

-late

Specifies the maximum derating factor. This factor specifies how late the signal can arrive

-net_delay

Specifies that derating factors are only to apply to net delays

-operating_conditions <operating_conditions>

Operating conditions Tcl object

<derate_value>

Timing derate value

<cells>

List of cell type objects

Description

This command can suppress timing failures and should only be used when advised by Intel Premier Support.

Sets the global derate factors for the current
design. The maxmimum and minimum delays of all timing
arcs in the design are multiplied by the factors
specified with the -late and -early options
respectively.  Only positive derate factors are
allowed. If neither the -cell_delay nor -net_delay
option is used, the derating factors apply to both
cell and net delays. For net delay derates, the derate
factor is applied to nets driven by matching cells.

Specifying a derate value of less than 1.0 for the
-late option or a derate value of greater than 1.0 for
the -early option reduces delay pessimisim, which
might lead to optimistic results from timing analysis.

The effect of set_timing_derate command is deferred
until the next time update_timing_netlist is
called. To reset derate factors to original values,
use the reset_timing_derate command.

This assignment is for timing analysis only, and is
not considered during timing-driven compilation.

Example Usage

set_timing_derate -early 0.9 [get_cells *]
set_timing_derate -late 1.1 [get_cells *]

Return Value

Code Name

Code

String Return

TCL_OK

0

INFO: Operation successful

TCL_ERROR

1

ERROR: Option -<string> has illegal value: <string>. Specify a legal option value.

TCL_ERROR

1

ERROR: Timing netlist does not exist. Use create_timing_netlist to create a timing netlist.

Tcl Package and Version	Belongs to ::quartus::sdc_ext 1.0
Syntax	`set_timing_derate [-h \| -help] [-long_help]` `[-cell_delay]` `[-early]` `[-late]` `[-net_delay]` `[-operating_conditions` <operating_conditions> `]` <derate_value> `[` <cells> `]`
Arguments	`-h \| -help`		Short help
	`-long_help`		Long help with examples and possible return values
	`-cell_delay`		Specifies that derating factors are only to apply to cell delays
	`-early`		Specifies the minimum derating factor. This factor specifies how early the signal can arrive
	`-late`		Specifies the maximum derating factor. This factor specifies how late the signal can arrive
	`-net_delay`		Specifies that derating factors are only to apply to net delays
	`-operating_conditions` <operating_conditions>		Operating conditions Tcl object
	<derate_value>		Timing derate value
	<cells>		List of cell type objects
Description	This command can suppress timing failures and should only be used when advised by Intel Premier Support. Sets the global derate factors for the current design. The maxmimum and minimum delays of all timing arcs in the design are multiplied by the factors specified with the -late and -early options respectively. Only positive derate factors are allowed. If neither the -cell_delay nor -net_delay option is used, the derating factors apply to both cell and net delays. For net delay derates, the derate factor is applied to nets driven by matching cells. Specifying a derate value of less than 1.0 for the -late option or a derate value of greater than 1.0 for the -early option reduces delay pessimisim, which might lead to optimistic results from timing analysis. The effect of set_timing_derate command is deferred until the next time update_timing_netlist is called. To reset derate factors to original values, use the reset_timing_derate command. This assignment is for timing analysis only, and is not considered during timing-driven compilation.
Example Usage	set_timing_derate -early 0.9 [get_cells ] set_timing_derate -late 1.1 [get_cells ]
Return Value	Code Name	Code	String Return
	TCL_OK	0	INFO: Operation successful
	TCL_ERROR	1	ERROR: Option -<string> has illegal value: <string>. Specify a legal option value.
	TCL_ERROR	1	ERROR: Timing netlist does not exist. Use create_timing_netlist to create a timing netlist.

set_timing_derate (::quartus::sdc_ext)