esd/check02.tcl

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###############################################################################
# Copyright (c) 2015-2024 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.
# =============================================================================
#   @script
#       Power Supply Port Protection
#
#       Algorithm
#           1. Identify all power supply ports in the design.
#           2. Check that a cell named "RC_Clamp" is connected to this port.
#           3. Add the nets without a connected "RC_Clamp" to the result list.
#
#       Example
#           demo/api/esd/testcase02.sp
###############################################################################


# -----------------------------------------------------------------------------
# check02Port - Check whether power port is connected to RC_Clamp cell.
# -----------------------------------------------------------------------------
#
proc ESD:check02Port {db port resultListVar} {
    upvar 1 $resultListVar resultList

    ##
    # Set the name of the RC clamp cell.
    #
    set rcClampCellName "RC_Clamp"

    ##
    # get connected net
    #
    set net [ESD:connectedNet $db $port]
    if {$net == {}} {
        return
    }

    ##
    # Ignore non power nets
    #
    if {![$db flag $net is power]} {
        return
    }

    ##
    # loop over all connected pins
    #
    set oids {}
    set ok false
    $db flat foreach pin -addHier $net pin {
        ##
        # Ignore start port
        #
        if {[$db oid isequal $pin $port]} {
            continue
        }

        ##
        # look for hier ports
        #
        if {[$db oid type $pin] eq "port"} {
            lappend oids $pin
            continue
        }

        ##
        # get instance
        #
        set inst [$db oid convertTo inst $pin]

        ##
        # ignore primitive pins
        #
        if {![$db isModule $inst]} {
            continue
        }

        ##
        # add hier pins
        #
        lappend oids $pin

        ##
        # Get name of referenced cell of instance pin
        #
        set name [$db oid cname $pin]

        ##
        # Check for RC_Clamp
        #
        if {$name eq $rcClampCellName} {
            set ok true
        }
    }

    if {$ok} {
        ESD:appendResult resultList $port $oids ""
    } else {
        ESD:appendResult resultList $port {} "No $rcClampCellName at power port"
    }
}


# =============================================================================
# Check02 - Power Supply Port Protection.
# =============================================================================
#
proc ESD:Check02 {db} {
    ##
    # Initialize the result list.
    #
    set resultList {}

    ##
    # Get top module.
    #
    set top [$db get_top_design]

    ##
    # Count top level ports
    #
    set count 0
    $db foreach port $top port {
        incr count
    }

    ##
    # Loop over all top level ports
    #
    set i 0
    $db foreach port $top port {
        zprogress push "" [expr {double([incr i]) / $count}]

        ESD:check02Port $db $port resultList
        if {[zprogress pop]} {
            break
        }
    }

    ##
    # Return the calculated result.
    #
    return $resultList
}