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221 | ###############################################################################
# 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
# I/O Port Diode Protection
#
# Algorithm
# 1. Identify the connectivity of I/O ports to internal MOSFETs.
# 2. Check if up diode exists with neg pin connected to power.
# 3. Check if down diode exists with pos pin connected to ground.
# 4. Verify that perimeter of each diode is at least 300um.
# 5. Add the violating nets to the result list.
#
# Example
# demo/api/esd/testcase07.sp
###############################################################################
# -----------------------------------------------------------------------------
# check07Diode - Check diode connected to power or ground.
# -----------------------------------------------------------------------------
#
proc ESD:check07Diode {db pin what extraVar} {
upvar 1 $extraVar extra
##
# get opposite pin
#
set oppositePin [ESD:oppositePin $db $pin]
if {$oppositePin == {}} {
return false
}
##
# get connected net
#
set net [ESD:connectedNet $db $oppositePin]
if {$net == {}} {
return false
}
##
# check for power / ground
#
if {[$db flag $net is $what]} {
lappend extra $oppositePin
return true
}
return false
}
# -----------------------------------------------------------------------------
# check07Port - Check diode protection .
# -----------------------------------------------------------------------------
#
proc ESD:check07Port {db port resultListVar} {
upvar 1 $resultListVar resultList
##
# get connected net
#
set net [ESD:connectedNet $db $port]
if {$net == {}} {
return
}
##
# loop over all connected pins
#
set gatePins {}
set upDiodePins {}
set downDiodePins {}
set extraPins {}
$db flat foreach pin -addHier $net pin {
##
# Ignore start port
#
if {[$db oid isequal $pin $port]} {
continue
}
##
# store hierPins
#
if {[$db oid type $pin] == "port"} {
lappend extraPins $pin
continue
}
##
# Get pin function of inst
#
set pinFunc [ESD:funcName $db $pin]
##
# Check all allowed types
#
switch -- $pinFunc {
"anode" {
if {[ESD:check07Diode $db $pin power extraPins]} {
lappend upDiodePins $pin
}
}
"cathode" {
if {[ESD:check07Diode $db $pin ground extraPins]} {
lappend downDiodePins $pin
}
}
"gate" {
lappend gatePins $pin
}
default {
##
# all other pins (and hierpins) which might be connected
#
lappend extraPins $pin
}
}
}
##
# Check for gate connection
#
if {[llength $gatePins] > 0} {
##
# set oids, if the oid list is too large, show only path from
# first gate to port.
#
set oids [concat $gatePins $upDiodePins $downDiodePins $extraPins]
if {[llength $oids] > 5} {
set firstGate [lindex $gatePins 0]
set oids [ESD:filterOids $db $firstGate $port $oids]
}
##
# Missing diodes.
#
if {([llength $upDiodePins] == 0) && ([llength $downDiodePins]==0)} {
ESD:appendResult resultList $port $oids "no diodes"
return
}
##
# Missing up diode.
#
if {[llength $upDiodePins] == 0} {
ESD:appendResult resultList $port $oids "no up diodes"
return
}
##
# Missing down diode
#
if {[llength $downDiodePins] == 0} {
ESD:appendResult resultList $port $oids "no down diodes"
return
}
##
# ok
#
ESD:appendResult resultList $port $oids ""
}
}
# =============================================================================
# Check07 - I/O Port Diode Protection.
# =============================================================================
#
proc ESD:Check07 {db} {
##
# Initialize the result list.
#
set resultList {}
##
# Get top module.
#
set top [$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:check07Port $db $port resultList
if {[zprogress pop]} {
break
}
}
##
# Return the calculated result.
#
return $resultList
}
|