flatfloatNodes.tcl

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###############################################################################
# Copyright (c) 2005-2024 by Altair Engineering, Inc.
# All rights reserved.
#
# Altair Engineering, Inc. makes this software available as part of the Vision
# tool platform.  As long as you are a licensee of the Vision tool platform
# you may make copies of the software and modify it to be used within the
# Vision tool platform, but you must include all of this notice on any copy.
# Redistribution without written permission to any third party, with or
# without modification, is not permitted.
# Altair Engineering, Inc. does not warrant that this software is error free
# or fit for any purpose.  Altair Engineering, Inc. disclaims any liability for
# all claims, expenses, losses, damages and costs any user may incur as a
# result of using, copying or modifying the software.
# =============================================================================
#   @plugin
#       Find Flat Floating Nodes
#   @namespace
#       FlatfloatNodes
#   @section
#       Analyze the Loaded Database
#   @description
#       Loop over all nets/signals and count the number of pins for each
#       net/signal. All nets/signals with exactly one pin are stored in the
#       Mem window.
#   @non-interactive
#   @files
#       flatfloatNodes.tcl
#   @example
#       demo/spice/amd2901.sp
#   @cmdline
#       -hspice @example[0]
#       -userware @files[0]
#   @tag
#       spice netlist
###############################################################################


# =============================================================================
# Init - Initialize the plugin.
# =============================================================================
#
proc FlatfloatNodes:Init {} {
    gui database runOrRegisterChangedCallback FlatfloatNodes:Run
}


# =============================================================================
# Finit - Finalize the plugin.
# =============================================================================
#
proc FlatfloatNodes:Finit {} {
    gui database removeChangedCallback FlatfloatNodes:Run
}


# =============================================================================
# Run -
# =============================================================================
#
proc FlatfloatNodes:Run {db} {
    ##
    # Return if the database is empty.
    #
    if {$db == {}} {
        return
    }

    set resList {}              ;# result List

    ##
    # clear the "yellow" flag (used below to skip multiple instantiations)
    #
    $db foreach module mod {
        $db foreach net $mod net {
            $db flag $net clear yellow
        }
    }

    set top [$db get_top_design]

    $db flat foreach signal $top sig {
        ##
        # skip power, ground and negpower nets
        #
        if {[$db isPgNet $sig]} {
            continue
        }

        ##
        # Skip nets with a value
        #
        set skip 0
        $db flat foreach net $sig net {
            if {[$db value $net] != ""} {
                set skip 1
                break
            }
        }
        if {$skip} {
            continue
        }

        ##
        # skip multiple instantiations of $sig
        #
        if {[$db flag $sig is yellow]} {
            continue
        }
        $db flag $sig set yellow

        set cnt 0
        $db flat foreach pin $sig pin {
            incr cnt
            if {$cnt == 2} {
                break
            }
        }
        if {$cnt == 1} {
            lappend resList $sig
        }
    }

    ##
    # Clear and activate the Mem Window
    #
    gui mem clear
    gui window show Schem
    gui window show Mem

    ##
    # Store the result into the Mem Window.
    #
    gui mem append $resList
}


# =============================================================================
# Call the initialization procedure.
# =============================================================================
#
FlatfloatNodes:Init