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141 | ###############################################################################
# Copyright (c) 2012-2024 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
# Cell tie-off.
#
# Algorithm
# 1. Identify all modules with supply ports.
# 2. Check that no input connects to another supply node.
# 3. Add the devices that violate the above rule to the result list.
#
# Example
# demo/api/erc/testcase07.sp
###############################################################################
# =============================================================================
# Check07 -
# =============================================================================
#
proc ERC:Check07 {db} {
##
# Initialize the result list.
#
set resList {}
##
# Clear the used visit flag at all database objects.
#
$db flag -db clear visit
##
# Loop over all modules in the loaded design.
#
zprogress push "" 0.05
set mcount [$db count module]
set m 0
$db foreach module module {
zprogress push "" [expr {double([incr m]) / $mcount}]
##
# Loop over all ports of the current module.
#
$db foreach port $module port {
##
# Skip unconnected ports.
#
if {![$db isConnected $port]} {
continue
}
##
# Identify supply ports.
#
set net [$db connectedNet $port]
if {[$db isPgNet $net]} {
$db flag $port set visit
$db flag $module set visit
}
}
if {[zprogress pop]} {
break
}
}
if {[zprogress pop]} {
return {}
}
##
# Get the top level design of the loaded database.
#
set top [$db get_top_design]
##
# Loop over all instances of 'visit' flagged modules.
#
set count [$db report objCount -inst]
set i 0
$db flat foreach instOfCell visit $top inst {
zprogress push "" [expr {double([incr i]) / $count}]
##
# Fill a hashtable with the supply names of this instance.
#
array unset _pgOk
array set _pgOk {}
$db foreach pin $inst pin {
if {[$db flag [$db down $pin] is visit]} {
if {[$db isConnected $pin]} {
set name [$db oid oname [$db connectedNet $pin]]
} else {
set name [$db oid pname $pin]
}
set _pgOK($name) 1
}
}
##
# Loop over all input pins and check that no input connects to a
# supply node other than the ones identified above.
#
$db foreach pin $inst pin {
if {[$db directionOf $pin] ne "input"} {
continue
}
if {[$db flag [$db down $pin] is visit]} {
continue
}
if {![$db isConnected $pin]} {
continue
}
set net [$db connectedNet $pin]
if {![$db isPgNet $net]} {
continue
}
if {![info exists _pgOk([$db oid oname $net])]} {
zmessage print DBG \
" Found result: $net"
lappend resList $net
}
}
}
##
# Return the calculated result.
#
return $resList
}
|