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Getting Started with Layout Compiled by Ryan Johnson May 1, 2002 Open Orcad Capture under Engineering Software Under FILE, choose NEW, PROJECT The following box should appear… To create a the circuit for your PCB, choose PC Board Wizard. Choose where you will save it and
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Compiled by Ryan Johnson
May 1, 2002
Open Orcad Capture under Engineering
Under FILE, choose NEW, PROJECT
The following box should appear…
To create a the circuit for your PCB,
choose PC Board Wizard.
Choose where you will save it and
what you will call it.
enable project simulation or not.
libraries to include in the design. If
you do not choose the right ones now,
they always can be added from the
This is where you will draw your schematic that your PCB will be modeled after.
Draw your circuit and simulate it to make sure it does what you want it to.
The next step requires that the design file be
Still with the design file highlighted select the following:
(Allegro is not installed on the computer at Calvin)
This completes everything that Layout will need to implement your circuit onto a PCB.
You can also create a bill of materials to see each part and how many you will need to construct the circuit.
You can check View Output File to see it.
Next you need to load your netlist that you created with your circuit in Cadence. This can be found where ever you saved your circuit. Find it and select it.
Next, layout will link your circuit to the PCB. Sometimes, your component footprints (the size, shape, and hole size for the component) will not be recognized or found. If this is the case the following warning will appear followed by several options:
The following window will appear where you can
select from various libraries, the component shape
that you want the component
to look like.
You can also create your own footprints by selecting Create or modify footprint library…
Next you need to choose which layers you will have on your board. If you are making this board at Calvin, you will probably only be using one side for traces. These means that all other layers need to be removed.
(Errors on the PCB will be circled)
Once you have your board outline or boundary defined, you are ready to place parts.
design rules after each modification
to the board.)
If you are not satisfied with the board placement or need to change the placement for any reason, you need to go to Options, choose Placement Strategy.
This will bring up a spreadsheet showing which passes have been completed.
The DONE needs to be changed in order to replace the board. To do this, highlight the passes that you want to redo, right click and choose Properties.
In the window that pops up, click off DONE, click OK.Next, under Auto, choose Unplace, Board. Now you are ready to re-place the board.
Sometimes it is desirable to get a certain look to your board. You can create groups of components that will be placed next to each other.
In the window that appears, enter a Group number. Then, re-place your board. These components will be placed next to each other.
If at anytime, you want to only view certain layers of the board, you have to make the layers that you don’t want to see invisible. To do this, choose the layer that you don’t want to see in the toolbar:
Then, under View, choose Visible<>Invisible. You will not be able to see this layer anymore.
Once you have placed the board, you are ready to route the board. You can manually route the board by selecting the Add/Edit Route Mode button on the tool bar:
Also, make sure that the Reconnect button is not selected (this allows you to see the routing.)
Auto routing is usually much easier and faster. It can also be modified if you are not happy with the results. To auto route the board, under Auto, choose Autoroute, Board.
Once you have the board how you want it to be, you need to create drill files.
PCB board manufacturers will use the Gerber file.
This is not needed for boards made at Calvin.
To change the Post Processor settings, under Options,
Choose Post Processor Settings.
Other reports that need to be generated include: a drill file that tells what size each hole needs to be and file that shows the coordinates of each component hole on the board.
are many reports that Layout
will produce. The two that are
vital to making boards
at Calvin include:
Cross References and Drills.
Select those and whether you
want to save to a disk or if you
want to view them (they will be
saved where you saved your