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233 | ###############################################################################
# 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 Protection with NMOS and Resistor
#
# Algorithm
# 1. Identify all inputMOS device gates connected to IO ports.
# 2. Check for ESD resistor between gates and I/O port.
# 3. Check that resistor has a minimum value of 100 Ohm.
# 4. Check for a diode connected NMOS device.
# 5. Add nets with improper ESD protection to the result list.
#
# Example
# demo/api/esd/testcase05.sp
###############################################################################
# -----------------------------------------------------------------------------
# countMosPins - count mos gate pins, s/d pin connected with gate to pg
# (as diode) and for connected resistors return the opposite
# pin.
# -----------------------------------------------------------------------------
#
proc ESD:countMosPins {db port gatePinsVar diodePinsVar resistorPinsVar \
extraPinsVar} {
upvar 1 $gatePinsVar gatePins
upvar 1 $diodePinsVar diodePins
upvar 1 $resistorPinsVar resistorPins
upvar 1 $extraPinsVar extraPins
##
# Init results
#
set gatePins {}
set diodePins {}
set resistorPins {}
set extraPins {}
##
# get connected net
#
set net [ESD:connectedNet $db $port]
if {$net == {}} {
return
}
##
# loop over all connected pins
#
$db flat foreach pin -addHier $net pin {
##
# Ignore start
#
if {[$db oid isequal $pin $port]} {
continue
}
##
# store hierPins
#
if {[$db oid type $pin] == "port"} {
lappend extraPins $pin
continue
}
##
# Check different function.
#
set pinFunc [ESD:funcName $db $pin]
if {$pinFunc eq "gate"} {
lappend gatePins $pin
} elseif {[ESD:mosDiode $db $pin extraPins]} {
lappend diodePins $pin
} else {
set primFunc [$db primFuncOf $pin]
if {$primFunc eq "RES"} {
##
# Get opposite resistor pin
#
set resistorPin [ESD:oppositePin $db $pin]
if {$resistorPin != {}} {
lappend resistorPins $resistorPin
lappend extraPins $pin
}
} else {
lappend extraPins $pin
}
}
}
}
# -----------------------------------------------------------------------------
# check05Port - Check whether port is connected to minimum 200 ohm resistor.
# -----------------------------------------------------------------------------
#
proc ESD:check05Port {db port resultListVar} {
upvar 1 $resultListVar resultList
##
# Get connected gate pins
#
set gatePins {}
set diodePins {}
set resistorPins {}
set extraPins {}
ESD:countMosPins $db $port gatePins diodePins resistorPins extraPins
##
# Gate pins direct connected to port are invalid
#
if {[llength $gatePins] > 0} {
foreach gatePin $gatePins {
set msg "direct gate '[$db oid print $gatePin]' connection"
set oids [ESD:filterOids $db $gatePin $port $extraPins]
ESD:appendResult resultList $port $oids $msg
}
return
}
##
#
# Check for invalid gates connected via resistor
#
foreach resistorPin $resistorPins {
##
# Look for gates, diodes
#
set gatePins {}
set morePins {}
ESD:countMosPins $db $resistorPin gatePins diodePins notNeeded morePins
##
# Check resistor value for gate pins connected via resistor.
#
if {[llength $gatePins] > 0} {
##
# Get instance of pin
#
set inst [$db oid convertTo inst $resistorPin]
##
# set oid list
#
set oids [concat $gatePins $diodePins $morePins $extraPins]
lappend oids $resistorPin
##
# Get resistor value
#
set resValue [$db attr $inst getValue "R"]
##
# Gate pins connected via too small resistor is invalid
#
if {$resValue < 100} {
set msg "resistor '[$db oid print $inst]' value $resValue"
append msg " too small"
ESD:appendResult resultList $port $oids $msg
return
}
##
# Check for missing diode MOS device
#
if {[llength $diodePins] == 0} {
ESD:appendResult resultList $port $oids "no mos diode"
return
}
##
# gate ok
#
ESD:appendResult resultList $port $oids ""
}
}
}
# =============================================================================
# Check05 - I/O Port Protection with NMOS and Resistor
# =============================================================================
#
proc ESD:Check05 {db} {
##
# Initialize the result list.
#
set resultList {}
##
# Get top module.
#
set top [$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:check05Port $db $port resultList
if {[zprogress pop]} {
break
}
}
##
# Return the calculated result.
#
return $resultList
}
|