get_fanouts (::quartus::sdc

Tcl Package and Version

Syntax

get_fanouts [-h | -help] [-long_help] [-asynch] [-clock] [-inverting_paths] [-no_logic] [-non_inverting_paths] [-stop_at_clocks] [-synch] [-through <names> ] <filter>

Arguments

-h | -help

Short help

-long_help

Long help with examples and possible return values

-asynch

Traverse through asynchronous edges

-clock

Traverse through clock edges

-inverting_paths

Only follow inverting combinational paths

-no_logic

Do not follow combinational paths

-non_inverting_paths

Only follow non-inverting combinational paths

-stop_at_clocks

Return clock targets as fanin/fanouts rather than traversing through them

-synch

Traverse through synchronous edges

-through <names>

Valid through nodes (string patterns are matched using Tcl string matching)

<filter>

Valid starting nodes (string patterns are matched using Tcl string matching or collection)

Description

Returns a collection of fanout ports, registers (and 
optionally clock targets) reachable from from the
<filter> in the design. When the -no_logic option is
used, get_fanouts ignores the paths that pass through
combinational logic elements other than buffers and
inverters.

When you use the -synch, -asynch, or -clock options,
get_fanouts traverses the netlist through corresponding
edges. You can specify more than one of these options.
If you do not specify any of these three
options, the command does not ignore any paths.

When the -non_inverting_paths option is used in
conjunction with the -no_logic option, get_fanouts
does not follow any paths that include an odd number
of inverters. Similarly, when the -inverting_paths
option is used in conjunction with the -no_logic
option, get_fanouts does not follow any paths that
include an even number of inverters. Both the
-non_inverting_paths and -inverting_paths options
require the -no_logic option and are mutually
exclusive.

When the -through option is used, only the fanouts
that can be reached by going through those nodes are
returned.

When -stop_at_clocks is used, combinational clock targets may 
be returned (in addition to clock or non-clock registers 
and ports), and registers or ports that can only be reached 
by traversing through a clock target will not be returned.

The filter for the collection is a Tcl list of
wildcards, and must follow standard Tcl or
Timing Analyzer-extension substitution rules. See the help
for use_timing_analyzer_style_escaping for details.

Avoid using the get_fanouts command if your design
targets a HardCopy series device or if you plan to
migrate your design to a Hardcopy series device.

Example Usage

set fanouts [get_fanouts $item]
foreach_in_collection fanout_keeper $fanouts {
	lappend fanout_keeper_list [get_node_info $fanout_keeper -name]
}

set fanouts_no_logic [get_fanouts $item -no_logic]
foreach_in_collection fanout_keeper $fanouts_no_logic {
	lappend fanout_keeper_list_no_logic [get_node_info $fanout_keeper -name]
}

# Using through option to find the fanout registers whose enable input is 
# connected to the signal while ignoring the inverting paths.
get_fanouts inst1 -no_logic -non_inverting_paths -through [get_pins -hierarchical *|ena]

Return Value

Code Name

Code

String Return

TCL_OK

0

INFO: Operation successful

Tcl Package and Version	Belongs to ::quartus::sdc_ext 1.0
Syntax	`get_fanouts [-h \| -help] [-long_help]` `[-asynch]` `[-clock]` `[-inverting_paths]` `[-no_logic]` `[-non_inverting_paths]` `[-stop_at_clocks]` `[-synch]` `[-through` <names> `]` <filter>
Arguments	`-h \| -help`		Short help
	`-long_help`		Long help with examples and possible return values
	`-asynch`		Traverse through asynchronous edges
	`-clock`		Traverse through clock edges
	`-inverting_paths`		Only follow inverting combinational paths
	`-no_logic`		Do not follow combinational paths
	`-non_inverting_paths`		Only follow non-inverting combinational paths
	`-stop_at_clocks`		Return clock targets as fanin/fanouts rather than traversing through them
	`-synch`		Traverse through synchronous edges
	`-through` <names>		Valid through nodes (string patterns are matched using Tcl string matching)
	<filter>		Valid starting nodes (string patterns are matched using Tcl string matching or collection)
Description	Returns a collection of fanout ports, registers (and optionally clock targets) reachable from from the <filter> in the design. When the -no_logic option is used, get_fanouts ignores the paths that pass through combinational logic elements other than buffers and inverters. When you use the -synch, -asynch, or -clock options, get_fanouts traverses the netlist through corresponding edges. You can specify more than one of these options. If you do not specify any of these three options, the command does not ignore any paths. When the -non_inverting_paths option is used in conjunction with the -no_logic option, get_fanouts does not follow any paths that include an odd number of inverters. Similarly, when the -inverting_paths option is used in conjunction with the -no_logic option, get_fanouts does not follow any paths that include an even number of inverters. Both the -non_inverting_paths and -inverting_paths options require the -no_logic option and are mutually exclusive. When the -through option is used, only the fanouts that can be reached by going through those nodes are returned. When -stop_at_clocks is used, combinational clock targets may be returned (in addition to clock or non-clock registers and ports), and registers or ports that can only be reached by traversing through a clock target will not be returned. The filter for the collection is a Tcl list of wildcards, and must follow standard Tcl or Timing Analyzer-extension substitution rules. See the help for use_timing_analyzer_style_escaping for details. Avoid using the get_fanouts command if your design targets a HardCopy series device or if you plan to migrate your design to a Hardcopy series device.
Example Usage	set fanouts [get_fanouts $item] foreach_in_collection fanout_keeper $fanouts { lappend fanout_keeper_list [get_node_info $fanout_keeper -name] } set fanouts_no_logic [get_fanouts $item -no_logic] foreach_in_collection fanout_keeper $fanouts_no_logic { lappend fanout_keeper_list_no_logic [get_node_info $fanout_keeper -name] } # Using through option to find the fanout registers whose enable input is # connected to the signal while ignoring the inverting paths. get_fanouts inst1 -no_logic -non_inverting_paths -through [get_pins -hierarchical *\|ena]
Return Value	Code Name	Code	String Return
TCL_OK	0	INFO: Operation successful

get_fanouts (::quartus::sdc_ext)