parasitic/topCapNets.tcl

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
###############################################################################
# Copyright (c) 2013-2024 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.
# =============================================================================
#   @plugin
#       Top Capacitance Nets
#   @namespace
#       TopCapNets
#   @section
#       Analyze the Loaded Database
#   @description
#       Report the top total capacitance nets in the design.
#   @configuration
#   @license
#       permit spice
#       available gv-spf
#   @files
#       parasitic/topCapNets.tcl
#   @example
#       demo/dspf/example.dspf
#   @cmdline
#       -readDSPF @example[0]
#       -userware @files[0]
#   @tag
#       parasitic dspf spf
###############################################################################


# =============================================================================
# Init - Initialize the plugin.
# =============================================================================
#
proc TopCapNets:Init {} {
    ##
    # Add the option to configure the number of reported nets.
    #
    gui plugin addConfig TopCapNets howMuch 10 number \
        "Number of Reported Top Cap Nets (0 for all)"

    ##
    # Create a menu entry to start the code.
    #
    gui menu command {"Parasitic" "Top Capacitance Nets"} \
        [list TopCapNets:Start]
}


# =============================================================================
# Finit - Finalize the plugin.
# =============================================================================
#
proc TopCapNets:Finit {} {
    ##
    # Undo modifications of the GUI.
    #
    gui menu removeEntry {"Parasitic" "Top Capacitance Nets"}
}


# =============================================================================
# Start - Create a list of the top capacitance nets.
# =============================================================================
#
proc TopCapNets:Start {} {
    ##
    # Get the database.
    #
    set db [gui database get]

    ##
    # Return if the database is empty.
    #
    if {$db == {}} {
        return
    }

    ##
    # Set the top level of the design.
    #
    set top [$db get_top_design]

    ##
    # Initialize a hash table to map netCap values to net OIDs.
    #
    array set _netCapHash {}

    ##
    # Loop over all parasitic nets.
    #
    $db foreach parasitic parasitic {
        ##
        # Ignore hierarchical parasitic net modules.
        #
        if {[$db flag $parasitic is parasiticHier]} {
            continue
        }

        ##
        # The signal of the parasitic net.
        #
        if {[catch {
            set signal [$db oid convertFromParasitic $parasitic]
        }]} {
            ##
            # skip unmatched
            #
            continue
        }

        ##
        # Get the 'netCap' attribute.
        #
        set netCap [$db attr $parasitic getValue "netCap"]

        ##
        # Show an error and skip this parasitic net if netCap is not set.
        #
        if {$netCap eq ""} {
            zmessage print ERR "NetCap not set at '$signal'"
            continue
        }

        ##
        # Add this net to the result list.
        #
        set netCap [zdb formatvalue fromspice $netCap]
        if {![info exists _netCapHash($netCap)]} {
            set _netCapHash($netCap) {}
        }
        lappend _netCapHash($netCap) $signal
    }

    ##
    # Post-process the _netCapHash to extract the configured number of top
    # capacitance net OIDs.
    #
    set topList {}
    set howMuch [gui plugin getConfigValue TopCapNets howMuch]
    foreach netCapValue [lsort -decreasing -real [array names _netCapHash]] {
        foreach net $_netCapHash($netCapValue) {
            lappend topList $net
            if {($howMuch > 0) && ([llength $topList] >= $howMuch)} {
                break
            }
        }
        if {($howMuch > 0) && ([llength $topList] >= $howMuch)} {
            break
        }
    }

    ##
    # Clear and activate the Mem Window
    #
    gui mem clear
    gui window show Mem

    ##
    # Store the result into the Mem Window.
    #
    gui mem append $topList
}


# =============================================================================
# Call the initialization procedure.
# =============================================================================
#
TopCapNets:Init