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347 | ###############################################################################
# Copyright (c) 2017-2024 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
# ESD related utility procedures.
###############################################################################
# -----------------------------------------------------------------------------
# connectedNet - Get connected net or {}
# -----------------------------------------------------------------------------
#
proc ESD:connectedNet {db pin} {
if {[$db isConnected $pin]} {
return [$db connectedNet $pin]
}
return {}
}
# -----------------------------------------------------------------------------
# isPG - Check whether given net is a power or ground net
# -----------------------------------------------------------------------------
#
proc ESD:isPG {db net} {
if {($net != {}) &&
([$db flag $net is power] || [$db flag $net is ground])
} {
return true
}
return false
}
# -----------------------------------------------------------------------------
# funcName - Get function name of given pin
# -----------------------------------------------------------------------------
#
proc ESD:funcName {db pin} {
set name {}
set orderNo [ESD:orderNo $db $pin]
if {$orderNo != {}} {
set primFunc [$db primFuncOf $pin]
switch -- $primFunc {
"NMOS" -
"PMOS" {
switch -- $orderNo {
0 {
set name "drain"
}
1 {
set name "gate"
}
2 {
set name "source"
}
default {
}
}
}
"ZDIODE" -
"DIODE" {
switch -- $orderNo {
0 {
set name "anode"
}
1 {
set name "cathode"
}
default {
}
}
}
default {
}
}
}
return $name
}
# -----------------------------------------------------------------------------
# orderNo - Get orderNo of given pin
# -----------------------------------------------------------------------------
#
proc ESD:orderNo {db pin} {
set orderNo 0
set inst [$db oid convertTo inst $pin]
$db foreach pin $inst p {
if {[$db oid isequal $pin $p]} {
return $orderNo
}
incr orderNo
}
return {}
}
# -----------------------------------------------------------------------------
# flagDevices - Utility procedure to flag devices using green.
# -----------------------------------------------------------------------------
#
proc ESD:flagDevices {db greenList} {
##
# Clear the green flag at all cells.
#
zprogress push "" 0.4
set count [$db count cell]
set i 0
$db foreach cell cell {
if {[zprogress update "" [incr i] $count]} {
break
}
$db flag $cell clear green
}
if {[zprogress pop]} {
return
}
##
# Loop over all primitives in the loaded database.
#
set count [$db count primitive]
set i 0
zprogress push "" 1.0
$db foreach primitive primitive {
if {[zprogress update "" [incr i] $count]} {
break
}
##
# Get the function of this primitive.
#
set func [$db primFuncOf $primitive]
##
# If the function is in the given list of 'green' devices then set the
# green flag at this device to identify them in the cone search.
#
if {[lsearch -exact $greenList $func] >= 0} {
$db flag $primitive set green
}
}
zprogress pop
}
# -----------------------------------------------------------------------------
# oppositePin - same as 'tdevice oppositePin' but return {} if not applicable.
# -----------------------------------------------------------------------------
#
proc ESD:oppositePin {db pin} {
if {[catch {$db tdevice oppositePin $pin} oppositePin]} {
return {}
}
return $oppositePin
}
# -----------------------------------------------------------------------------
# diode - true if given the cathode of a diode is connected with anode to p/g
# -----------------------------------------------------------------------------
#
proc ESD:diode {db pin extraListVar} {
upvar 1 $extraListVar extraList
##
# Get function of inst
#
set primFunc [$db primFuncOf $pin]
if {$primFunc ne "DIODE"} {
return false
}
##
# check connected pin
#
set pinFunc [ESD:funcName $db $pin]
if {$pinFunc eq "cathode"} {
set anodePin [$db tdevice oppositePin $pin]
set anodeNet [ESD:connectedNet $db $anodePin]
if {($anodeNet != {}) && ([$db flag $anodeNet is ground])} {
lappend extraList $anodePin
return true
}
}
return false
}
# -----------------------------------------------------------------------------
# mosDiode - return true if given pin is a MOS diode connected to power/ground
# -----------------------------------------------------------------------------
#
proc ESD:mosDiode {db pin extraListVar} {
upvar 1 $extraListVar extraList
##
# Get function of inst
#
set primFunc [$db primFuncOf $pin]
if {($primFunc ne "NMOS") && ($primFunc ne "PMOS")} {
return false
}
##
# check connected pin
#
set pinFunc [ESD:funcName $db $pin]
if {($pinFunc eq "source") || ($pinFunc eq "drain")} {
set inst [$db oid convertTo inst $pin]
set gatePin [$db getFuncPort $inst -name "gate"]
set gateNet [ESD:connectedNet $db $gatePin]
if {($gateNet != {}) && [ESD:isPG $db $gateNet]} {
set otherPin [$db tdevice oppositePin $pin]
set otherNet [ESD:connectedNet $db $otherPin]
if {($otherNet != {}) && [$db oid isequal $otherNet $gateNet]} {
lappend extraList $otherPin $gatePin
return true
}
}
}
return false
}
# -----------------------------------------------------------------------------
# series - count primitive instances connected in series to power or ground.
# starting with given pin
# -----------------------------------------------------------------------------
#
proc ESD:series {db pin wantedPinFunc wantedPG pinListVar} {
upvar 1 $pinListVar pinList
set count 0
set pins [list $pin]
array unset visited
##
# loop until stop criteria reached
#
while {true} {
##
# check pin function
#
set pinFunc [ESD:funcName $db $pin]
if {$pinFunc ne $wantedPinFunc} {
return 0 ;# $pin has not wanted pin function
}
##
# Get opposite S/D pin or Anode/Cathode pin
#
set oppositePin [ESD:oppositePin $db $pin]
if {$oppositePin == {}} {
return 0 ;# $pin has no opposite pin (e.g. bulk or toplevel port)
}
##
# count primitive
#
incr count
lappend pins $oppositePin
##
# Get connected net
#
set net [ESD:connectedNet $db $oppositePin]
if {$net == {}} {
return 0 ;# opposite pin is not connected
} elseif {[info exists visited($net)]} {
return 0 ;# opposite pin loops to already visited net
} elseif {[ESD:isPG $db $net]} {
if {[$db flag $net is $wantedPG]} {
set pinList [concat $pinList $pins]
return $count
}
return 0 ;# wrong power reached
}
##
# avoid loops
#
set visited($net) 1
##
# get next pin
#
set pin {}
$db flat foreach pin $net nextPin {
##
# Ignore start port
#
if {[$db oid isequal $nextPin $oppositePin]} {
continue
}
##
# check for multiple connections
#
if {$pin == {}} {
set pin $nextPin
lappend pins $pin
} else {
return 0 ;# too many connections
}
}
}
}
# -----------------------------------------------------------------------------
# appendResult - append result to given result list.
# -----------------------------------------------------------------------------
#
proc ESD:appendResult {resultListVar startOid otherOids descr} {
upvar 1 $resultListVar resultList
lappend resultList $startOid $otherOids $descr
}
# -----------------------------------------------------------------------------
# filterOids - try to filter path from 'pinOid' to 'portOid' or $extraPins
# -----------------------------------------------------------------------------
#
proc ESD:filterOids {db pinOid portOid extraPins} {
set path [$db cone -targetObj $portOid $pinOid]
if {$path == {}} {
return [concat $extraPins [list $pinOid]]
}
return $path
}
|