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lvx - Online in the Cloud

Run lvx in OnWorks free hosting provider over Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

This is the command lvx that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

PROGRAM:

NAME


lvx - Logical Versus eXtracted net-list comparator

SYNOPSIS


lvx format1 format2 filename1 filename2 [ -a ] [ -u ] [ -o ] [ -f ]

DESCRIPTION


lvx compares two gate-level or block level net-list. The goal is to compare a
specification net-list (logical net-list), the input to a place and route tool, with the
physical net-list (extracted net-list) obtained by the cougar(1) extractor.
The net-list 1 is considered as the logical net-list and net-list 2 as the extracted net-
list.
lvx is an one-level hierarchical tool:

The two net-list are flattened, if the -f option is present, to the cells contained
in the catalog file. The path to the catalog file is indicated in the
MBK_CATA_LIB(1) variable for the cell library, and in the MBK_WORK_LIB(1) variable
with the name MBK_CATAL_NAME(1) for user blocks ( catal(5) ) that are not to be
flattened.

For both net-list, the instances are considered as black-boxes.

The two net-list must have the same external connectors names.

The two net-list must have the same instances names.

The two net-list must have the same signals names for unconnected signals.

The two net-list cannot directly contain transistors.

Comparison is performed in three steps:

Compare terminals.

Compare instances.

Compare connections.

Compare unconnected signals.

If an error occurs during first or second step, a message is immediately displayed and the
third step will not start: lvx cannot compare connections (signals) if terminals or
instances are not equivalent.
The -o option allows to order connectors if the steps described before have been reached
successfully. Extracted_netlist is then saved on disk. The file get the name filename2
suffixed by the value of MBK_OUT_LO(1) variable.
Routers add automatically empty feed-through cells. These cells must not be taken into
account in the comparison. A cell that have the F attribute in the catalog file ( catal
(5) ) is considered as feed-through cell, and are deleted, in memory, from the net-list
where it appears.

OPTIONS


-a Some routers generate layout with several physical connectors for power and ground
( VDD or VSS ). If those connectors are not internally connected, they will have
different indexed names ( VDD1 , VDD2 etc...) in the extracted net-list. It is
possible to perform reduction on those power and ground connectors before
comparison, using the -a option. After reduction, each instance contains only one
VDD connector and one VSS connector, as the main figure.

-o In this case, lvx produces a modified net-list (saved with the name filename2 ),
which is a copy of net-list 2 with ordered connectors. Terminals and instance
connectors are relisted in the order of the models in net-list 1. The saved net-
list is done with the MBK_OUT_LO(1) format, so user has to set this variable before
running lvx . If he does not, default value is used, and net-list 1 could be lost
if filename are identical and input format same as output format.
If -a option is used, then the saved net-list is the reduced net-list with only one
VDD and one VSS .

-u This option force lvx to check the consistency of unassigned signals between the
two netlists.

-f The two net-lists are flattened to the leaf cells contained in the catalog file.
Usually the extracted net-list is a flatten net-list, while the logical one can be
a hierarchical net-list.

EXAMPLES


With logical_netlist named amd2901.vst and the corresponding extracted_netlist as
amd2901.al containing multiple power connectors, the command line is :

lvx vst al amd2901 amd2901 -a

OUTPUT FILES


filename2.xx Netlist view saved when the -o option is present. The suffixe depend
on the MBK_OUT_LO(1) environment variable.

ENVIRONMENT VARIABLES


MBK_CATA_LIB contains the directories where the cell librtaries are. MBK_WORK_LIB
contains the directory path of the working directory, usually set to .
(dot).

MBK_OUT_LO contains the expected format of the netlist output.

MBK_CATAL_NAME contains the name of the user cell catalog.

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