Libris Britannia 4/science library(b).zip/science library(b)/ELECTRON/PCB_DESI/H031A.ZIP/PADSDEMO/FILES/FILES.EXE/DEMO.TXT

Text File | 1992-01-14 | 23KB | 876 lines

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                 PADS SOFTWARE, INC.

     Welcomes you to the Evaluation Package for

                      PADS-PCB

          Personal Automated Design System
             for Printed Circuit Boards

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                 PADS-PCB

  IS THE MOST POPULAR PRINTED CIRCUIT BOARD
  DESIGN SYSTEM IN THE WORLD!

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  In this evaluation we will demonstrate the
  capability of PADS-PCB!

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This evaluation is in two parts:

PART ONE:  This part is an automatic, self-running
           demonstration. Simply relax and view
           the features of PADS-PCB.

PART TWO:  The second part is a shareware version
           of the actual software, with all of the
           features needed to design real PCB's.

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If you wish to leave this automatic demonstration
and use the shareware,  select  CTRL-X.
(While holding down the Ctrl key, press X).

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If you wish to pause during the demonstration,
select the space bar. To resume, press the space
bar again.

If you wish to move on, press any key except
the space bar.

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   PADS-PCB is the BEST PRICE/PERFORMANCE SOLUTION

PADS-PCB is the most powerful low-cost PCB design system
you can buy for your personal computer.

It provides an array of automatic and interactive tools
to design today's complex designs at a suprisingly
affordable price.

PADS-PCB is easy to learn and use -- so whether you only
occasionally design PCB's or you spend full time at it,
PADS-PCB can help you.

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         PADS-PCB DESIGN AND LAYOUT FEATURES:

* 1 mil grid resolution, metric and inch units supported

* 30 layers

* Large design capability - over 400 14 pin equivalent IC's

* Full support for ANALOG, DIGITAL, and SMD designs

* Blind and Buried Via support

* Fast Design Rules Checking to 1 mil accuracy

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           MORE FEATURES...............

 * Fast, Graphical Library Browsing

 * On-Line Part Editing

 * Automatic Plane Generation with support for
   split planes and thermal relief checking

 * Dynamic Rubberbanding of connections

 * Component Rotation to 90 degrees

 * Powerful Group Functions

     * Full Macro support

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  PADS-Logic + PADS-PCB = A TOTALLY INTEGRATED SYSTEM

PADS-Logic, our powerful low-cost schematic capture tool,
shares not only the same user interface with PADS-PCB, but
also, a common library and library database manager.

As a result, the PADS integrated design system supports
AUTOMATED ECO processing!  Full forward and backward ECO
capability including gate and pin swapping, component
rename from pcb to schematic, and, automatic add/delete
connections, parts, and routes; plus, you can rename nets
and parts from the schematic to the pcb!

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        TOTAL UPWARD MIGRATION TO PADS-2000

For those designs that may reach the limits of PADS-PCB,
PADS Software, Inc. has your solution........

.......For your most demanding designs, you can feel
confident knowing your files created in PADS-PCB will
transfer directly into PADS-2000 with NO conversions!

PADS-2000 is our high-performance DOS product.  It uses
the same library and library database manager as PADS-PCB.

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TOTAL UPWARD MIGRATION TO PADS-2000

PADS-2000 is written in 32-bit code.  As a result, you
can design boards greater than 4.5 feet square, over 4000
equivalent IC's, over 32,000 connections, all with a
database resolution of 1 micron.

PADS Software, Inc. makes it easy for you to upgrade into
PADS-2000 by offering credits for your PADS-PCB system.
You can apply these credits to your purchase of PADS-2000!

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Now, on with the PADS-PCB demonstration..............


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MACROS

PADS-PCB has full Macro support including MODELESS
COMMANDS.  Modeless commands are time savers. They
let you select commands without going through the
menu hierarchy.

For example, you can search for any item in your
database, instantly change your grid, level, or
track width.  You can highlight a named trace in
your design and instantly change your text height
and line width.

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PARTS LIBRARY

The parts library provided with PADS-PCB is an
integrated CAE/CAD library containing the electrical
properties together with the physical component
information.

Over 6,000 parts are availabe and a Part Editor is
provided so you can easily create or modify a part.
The Part Editor can be accessed ON-LINE at any time.

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            MULTIPLE USER LIBRARIES

PADS-PCB allows you to define multiple USER Libraries.

PLUS......

A Library Merge feature allows you to easily exchange
parts with other PADS designers.


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<---------- INPUT/OUTPUT MENU

This menu is used to input netlist data from schematic
capture systems.  Inputs are possible from PADS-LOGIC,
FutureNet, Orcad, Viewlogic, Capfast, Schema, and others.

Observe how quickly a job can be retreived from disk.

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ON-THE-FLY

The ON-THE-FLY commands let you design your board
without starting from a net list or schematic
input.

Let's assume you already know the circuit
contents even without a schematic.  Simply call
up the parts using the Library Browse routine,
place the parts, then connect and route your
traces.  Let's watch how easily this is done
with PADS.

Incidentally, no other CAD System has a
comparable feature!


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THE SETUP ROUTINE:

The Setup routine is used to "Setup the Software"
for your particular wishes, (for example, to select
the colors used to distinguish layers at the CRT),
set the number of layers on the board, set the size
and shapes of PADS and Tracks, and other criteria.

In the next CRT sequence you will see how SETUP is
used to change the display from a blue background
to a black background, to change the items on
Layer One from a green color to a yellow color,
and change Layer Two from a blue color to a
red color.

Let's watch..........

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THE CREATE ROUTINE:

The Create Routine is used to create free text
on the board, create 2-D dimensional lines,
areas of copper, and component decals.  In the
next CRT sequence, you will first see an area
of copper and text being created.

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COMPONENT PLACEMENT:

Correct Component Placement is one of the most
important phases in the layout of a board.
One must have good Component Placement in order
that the board can be routed.

PADS-PCB has more Placement aids, both manual
and automatic than does any other CAD system.
Among these Placement aids are Move, Rotate,
Opposite Side, Connection Length Minimization,
Automatic Placement, Auto Gate Swap, Auto Pin
Swap, Step and Repeat, and many other aids,
as you will see.

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MOVING PARTS:

You use the mouse cursor to pick
a part and move it anywhere on the
board. Notice how the connections
rubber band with the part as it
is moved.

Very useful in evaluating  one location
over another, in real time.

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ROTATING PARTS

You can rotate parts 90 degrees.........

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ALTERNATE PARTS:

The ability to change the configuration of the
part after it has already been placed on the
board is very valuable. The following two
examples will illustrate:

First suppose you are designing a very dense
analog board and you find yourself running out
of room. To make more room wouldn't it be nice
if you could stand parts "On End" rather than
laying them flat.

With PADS-PCB you can! Let's Watch!

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SECOND EXAMPLE:

You are designing a board using DIP parts and
you have completed the board placement. You find
you must switch from DIP packaging to Surface
Mount Device (SMD) packaging but you do not want
to replace the parts on the board.  During
conversion to SMD parts you want to place
some SMD parts on both the Top layer and the
bottom layer.

Again, easy to do with PADS!

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LENGTH MINIMIZATION:

The ability to minimize the total length of the
connections on the board is an essential feature
to any CAD system.

Let's watch Length Minimization in action on a
single net. First you see the connections
of a single net as they might appear when the
parts are initially placed on the board. Then
you will see the connection pattern of the net
after Length Minimization resequenced the
order of the nodes to shorten the length
of the net.

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Get the idea of Length Minimization?

Let's now see how Length Minimization works on
an entire board where the parts have been placed
but the connection length has not yet been
minimized.  Typically, the length is reduced
by, in the order of 30-35 percent.

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VIEWING OF THE CONNECTION PATTERN

While placing parts, you should be able to view
the ratsnest of the connection pattern as it
evolves. With PADS-PCB you can can see a single
net of your choice such as the CLOCK net.

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- - - or you can view only Power or Ground.

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---- or you can see all the connections on the board.

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AUTO PLACE:

The Parts Placement features you have seen up
to this point are interactive (Manual). You make
the decision and the system implements your
decisions.

PADS-PCB also automatically places the parts,
without assistance from you. It is especially
useful for placement of components on Digital
boards.  In the next sequence observe
AUTO PLACE, a PADS-PCB option, automatically
placing the components on the board, without
any assistance from the designer.

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The sequence you will observe is a follows:

First, the matrix on which the system places
the parts, is displayed for your information.

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<---- Next, you will see the first AUTO-PLACE
      Algorithm move the parts from their initial
      location, onto the board and locate them
      on the matrix. This placement is a preliminary
      placement only.

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<---- Next, you will see a second AUTO-PLACE
      Algorithm refine and complete the initial
      placement of the ICs.

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Next, the decoupling caps are AUTO-PLACED.

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AUTOMATIC GATE/PIN SWAP:

With PADS-PCB you can either automatically
or interactively swap Gates and Pins.
A Batch Change Order file is created that
automatically (hands off) updates your
PADS-LOGIC schematic originally used to
create the board database.

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GOODNESS OF PLACEMENT EVALUATION:

"Goodness of Placement" evaluators literally
lead you to a good placement.  These
"Goodness of Placement" evaluators, together
with your good judgment and the PADS-PCB
Component Placement routines, will
quickly permit you to make a good placement
of the parts on your board, even if you are
not an experienced Board designer.

PADS-PLACE has two "Goodness of Placement"
evaluators.

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CONNECTIONS HISTOGRAM:

A "Connection Histogram" provides a graph
in both the X and Y axis depicting
the ratio of connections per routing
channel in X or Y. Peaks in the Histogram
indicate potential problem channels during
routing.

DENSITY MAP INDICATOR:

The Connection Density Map Evaluator is
a color map of the relative density of
connections over the board.

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RENAMING PARTS:

PADS-PLACE also includes a routine to
automatically rename the components on
the board from the random fashion that
exists after placement, to a sequence of
your choice.

In the next CRT presentation, you will
see all the components renamed so that
the Reference Designations start in the
upper left hand corner and complete in
the lower right hand corner. Notice the
speed of automatic renaming.

A Change Order File is being
automatically generated that is
used to update the schematic with
the new Reference Designations.

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STEP AND REPEAT:

A group of parts and tracks can be "grouped"
and moved, rotated, or stepped and repeated.

When Stepped and Repeated, the new groups
have new Reference Designations automatically
assigned! - You don't need to keep track of
and name the parts.

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We want to step and repeat a group of parts
and tracks two additional times.

There is not enough room on the board, so
watch while we quickly modify the board
outline with BOARD MODIFY.

We then "Step and Repeat" the circuit two
additional times.  SIMPLE!

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This now completes the evaluation of PARTS-PLACEMENT.
As you have seen the PADS-PLACE features are second
to none, including the $100,000 Engineering
workstations.

Let's now examine Connection Routing.

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CONNECTIONS ROUTING

The routing of connections is the act of turning
Connections into Routes or Tracks.

Fully 70% of the total time used in designing
a board is spent in the conversion of connections
into tracks; therefore, selecting a system that
has easy and rapid routing capability is, without
doubt, the most important criteria in your
evaluation process.

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Rapid routing is one of the major strong points
of PADS-PCB.

PADS has two methods of connection routing. The
first is Interactive (or Manual) routing wherein,
you the designer, route the connections. The
second is an option called "PADS-ROUTE", an
automatic router.

In the CRT sequences which follow, you will be
shown both Interactive and Automatic routing.

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INTERACTIVE ROUTING:

In interactive routing one uses the mouse to
select the connection to be routed, add corners
to the tracks, change from one layer to the
other as required, and finally, to complete
the connection to the correct pin.

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When a connection is selected, the track
starts from the "beginning" pin and
follows the mouse cursor as it is moved,
laying down the track at it's correct
width behind the cursor. The unrouted
connection in front of the cursor guides you
to the "finishing" pin.

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Corners can be put in the track
at a 90 degree angle...

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...A corner can be put in the track
at a 45 degree angle...

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Finally corners can be put at any
angle, in one degree increments....

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As a track is transfered to another layer,
an automatically inserted Via transfers
the track to the other layer.

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CORRECT CONNECTIVITY:

With PADS-PCB tracks always automatically
finish to the correct "terminating" pin.
This feature is called "Maintaining
Connectivity" and guarantees that
tracks cannot be connected to pins
that are not in the net.

A most important feature!

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Watch now as the designer interactively routes
some connections.

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TRACK NECK DOWN:

Tracks can be "necked down" so as to
route between IC pins or Surface Mount
Pads, without spacing violations.
Similarly, Power and Ground tracks can be
thickened up for increased current
carrying capacity.

Let's watch.....

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MODIFY ROUTE:

It is very important to have a rapid method of
modifying routed tracks . The PADS-PCB Modify
Routine is especially powerful and easy to use.

With Modify Route, one can delete a corner, add
a corner, move a track, move a segment, cut a
segment, and transfer segments from one layer to
the other with the Vias either automatically
inserted or removed, as the case may be.

Observe the ease with which routed tracks can
be modified.

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...Move a segment...

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...Move a track from one layer to another....

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...Cut a segment...

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... Insert a corner.....

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AUTOMATIC ROUTING:

PADS-ROUTE has an Automatic router option
that contains three different automatic
routers.

1) A Power/Ground connection Heuristic router
2) A Memory connection Heuristic router
3) A Lee's maze search router

All Routers observe the correct track width,
spacing, and pad sizes and shapes, and routes
"correct by construction;" thus, there are no
spacing violations.

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PADS-ROUTE SUMMARY:

The PADS-ROUTE auto-router is an excellent low
priced, high performance Auto-router. On boards
of average density of about 0.6 square inches
per IC, it will achieve in the order of 90-95%
completion, after which the remaining unrouted
connections are routed interactively by the designer.

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THE PADS SUPERROUTER:

PADS Software offers an alternative, very high
performance router called, "PADS SUPERROUTER."
The PADS SUPERROUTER "Rips-Up and Re-routes"
until 100% of the connections on the most
difficult boards, are routed. If 100% is not
achieved, rip-up and re-route of the routed
tracks continues until 100% or near 100%
completion is achieved.

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THE PADS SUPERROUTER:

In benchmarks, the PADS SUPERROUTER has
exceeded the performance of every
Auto-Router on the market, including    the
famous CALAY system,  the MAXROUTE router,
and others, yet, PADS SUPERROUTER cost
only a fraction of their cost.

If you plan on routing large complex boards,
you should consider the PADS SUPERROUTER.
It is the best investment you can make!

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ENGINEERING CHANGE ORDER:

The incorporation of engineering change
orders (ECO) to both the Schematic and PC
Board is very important.

In PADS-PCB, changes to the board, such
as Gate and Pin Swapping and Component
Rename, automatically update the schematic.
Similarly, changes in the schematic
automaticaly update the board.

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CHECKING:

When evaluating different CAD Packages,
ensure the Systems have the ability to
check for space or air gap violations.
Some of the lower priced CAD Systems on
the market do not have this capability!
In these instances, you will need to make
a plot of each layer of artwork and
laboriously check over each pad and track
to ensure compliance with your air gap
spacing.

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SPACE CHECK, CON'T:

PADS-PCB has a very fast space check capability.
The check is made to +/- one mil.  Any violations
of the established air gap are depicted at the
location and on the layer where the violation has
been made.

In the next CRT sequence, we will deliberately
create some space violations by the use of the
Modify Route. We first create a short circuit
on Layer Two; we will then move a track too
close to another track, and finally we will move
a track too close to a pad. Space Check will
then be run and you will see errors indicated.

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  Seven errors are reported.

PADS-PCB protects you from making
spacing errors.

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COMPUTER-AIDED-MANUFACTURING (CAM):

PADS-PCB provides complete post-processing for
Computer Aided Manufacturing. Outputs are
available to Matrix Printers, Wet Ink Plotters,
Gerber and Laser Photo Plotters, and Drill Tapes.

Outputs include Assembly Drawings, Artwork for
all layers, Ground and Power planes, Solder
masks, SMD masks and Drill Drawings.

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COMPUTER-AIDED-MANUFACTURING (CON'T):

PADS Post-processing is very User friendly.
The approach used is a series of CRT
screens which have been pre-programmed
for various outputs. You simply respond
in the affirmative and  proceed to the
next screen. Should you wish to change a
pre-programmed output, you make the
change and then proceed to the next
CRT screen.

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Watch now as a Gerber file is created for
the Layer one artwork of the board.

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PADS-PCB has the capability of single
layer, 2 layer, and multi-layer designs.
Both Analog, Digital, and SMD designs can
be handled.

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LARGE BOARD CAPABILITIES:

Many of the Personnal Computer based CAD
systems on the market today are limited to
the design of small boards.

PADS has the capability of designing
boards of over 400 14 pin equivalent ICs.

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SMD BOARDS

PADS-PCB has complete SMD design capability
including SMD decals, top and bottom layer
placement, routing to correct layer, thru vias,
blind vias, buried vias, regular size vias,
micro size vias, track thinning, Part Decals
with built in Exit pads, etc.

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POST SALE SUPPORT:

Support, after you have purchased your CAD System,
is also very important.....

PADS Software, Inc.'s post sale Support has earned
a reputation of the "Best Buy" in the industry,
and for good reasons.  Our support provides the
following:

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1. Hot line Telephone Support that can instantly
   resolve 90% of all problems.

2. An analysis of any of your board files with
   problems.

3. "No cost" updates of Software to correct bugs
   reported either by yourself or any PADS-PCB
   User around the world.

4. "No cost" enhancements to the Software to
   improve capabilities and performance.

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THE LOW COST OF PADS-PCB:

We keep your costs to a minimum by configuring
the system to your specific needs. You don't
need to purchase options you will not be using,
instead you select only those features you
actually need!

With our unique "Try Before Buy" plan you can
try the system before you actually purchase it.
That's how confident we are about PADS-PCB.

Finally, if you currently have a PCB CAD system
and you are not satisfied with it's performance
or high annual maintenance upkeep, we will even
purchase that system from you, when you purchase
your new PADS-PCB system.

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EVALUATION CONCLUSION:

This concludes Part One of our
Evaluation Package. We thank you for
your interest in PADS-PCB and we trust
that this evaluation, together with
Part Two, contained herein, will serve
the purpose of demonstrating the many
and advanced features of PADS to you.

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PADS is available from your local
Authorized PADS Dealer or from PADS
Software, Littleton, Massachusetts.
1-508-486-9521

This Evaluation provided by:

     PADS Software, Inc.
     119 Russell Street
     Littleton, Ma. 01460
     1-800-255-7814

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