get_fanouts (::quartus::sdc_ext)
The following table displays information for the get_fanouts Tcl command:
Tcl Package and Version |
Belongs to ::quartus::sdc_ext 1.0 |
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Syntax | get_fanouts [-h | -help] [-long_help] [-inverting_paths] [-no_logic] [-non_inverting_paths] [-stop_at_clocks] [-through <names> ] <filter> | |||
Arguments | -h | -help | Short help | ||
-long_help | Long help with examples and possible return values | |||
-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 | |||
-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 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. |
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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] |
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Return Value | Code Name | Code | String Return | |
TCL_OK | 0 | INFO: Operation successful |