cCoupling.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
#       Coupling Capacitors
#   @namespace
#       CCoupling
#   @section
#       Analyze the Loaded Database
#   @description
#       Report coupling Cs in the Mem window.
#   @non-interactive
#   @files
#       cCoupling.tcl
#   @example
#       demo/spice/amd2901.sp
#       demo/spice/csim90/gm19.sp
#   @cmdline
#       -hspice @example[0]
#       -userware @files[0]
#   @tag
#       spice parasitic dspf spf
###############################################################################


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


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


# =============================================================================
# Run - The cCoupling procedure loops over all Cs and checks if they
#       connect neither to power nor to ground - that means they couple
#       two data wires.  The coupling Cs are reported to the Mem window.
# =============================================================================
#
proc CCoupling:Run {db} {
    ##
    # Return if the database is empty.
    #
    if {$db == {}} {
        return
    }

    set resList {}              ;# result List

    ##
    # loop over all instances in all modules
    #
    $db foreach module mod {
        $db foreach inst $mod inst {
            ##
            # skip everything except Cs
            #
            if {[$db isModule $inst]} {
                continue
            }
            if {[$db primFuncOf $inst] != "CAP"} {
                continue
            }

            ##
            # check both connected nets, if either one connects to power or
            # ground, then set ok=1 (don't report).
            #
            set ok 0
            $db foreach pin $inst pin {
                if {[$db isConnected $pin]} {
                    set net [$db connectedNet $pin]
                    if {[$db isPgNet $net]} {
                        set ok 1
                    }
                }
            }
            if {!$ok} {
                lappend resList $inst
            }
        }
    }

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

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


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