Foreword
This article will detail the record allegro netlist been imported, imported components, and the problems often encountered in import and analysis.
Previous article: Cadence Allegro Schematics DRC, generates a netlist and import the PCB .
View and rendering components to be placed and frame
First, take a look at what components are to be arranged which, by the way is not a final check netlist import good.
As shown in the figure below, click on the placement -> manual, the following pop-up window, you can see all the components of the numbers.
Then draw a picture and frame to define a boundary, preferably in the options board geometry in the active class and subclass right. Then presses the selection screen shown in FIG rectangle tool to block out a rectangle, when the temporary boundary. Such components will be arranged in turn in the rim when introduced components, convenient.
Import PCB library
Previous article mentioned before, allegro need to import the package library into the match and netlist component package name.
Click setup -> user preferences editor:
Click paths -> library. Window as shown below, where the need to add the library path, and are padpath psmpath.
allegro inside the package file editor is .dra, but applied to the pcb file must be generated is derived from the document .dra .psm and .pad file. Allegro package on those things, the future will be carefully studied + the article. Digging .
Generally, we will .dra, .psm, .pad files are placed in a folder inside the package as a library, so you need to set these two paths are generally the same.
After setting up the path to apply about, and start device is arranged.
Rapid deployment components
Click on placement -> quickplace.
Following pop-up window, as shown by the check, the click will start automatically arranged palce components.
Rapid results as shown arrangement, the visible components are arranged sequentially to the edge and frame.
AD have that feeling, then import it not go wrong? All components are imported successfully yet?
Error query and analysis solution
Unlike when introduced allegro AD panels are introduced to check the problem arise. Considerable extent need to "manual positioning."
The first step mentioned above can go to view the unplaced components, we first need to thoroughly understand what the components are not imported.
Placement -> Manual .
You can see, there are four components for various reasons, can not be successfully imported into the pcb.
Navigate to no success "transit robbery" components are, the next step is to find ways to put them through.
Capacitor C1
Capacitance / resistance / inductance of things, is a two-terminal passive device schematics but was not found impossible to incorrectly drawn; but the simplest such package and is unlikely to be wrong. This time in relation to suspect, is not accidentally package name wrong.
Back to schematics, find c1, double-click on the pop-up the following components of the Properties window, you can clearly see the package name wrong.
After the modified c0603, remember to regenerate the netlist; introducing new netlist to PCB .
Because the package names are netlist, the netlist data as long as an update, it is necessary to regenerate and import.
After introducing a new netlist is completed, the manual check inside the window C1, c1 can be moved out of the place, and after have been placed close to the bottom of the manual clicking widget.
It is already become.
Open the manual window again, you can see a good placement of the device has been removed from the list.
Power supply terminal J6
Such terminals are components of large error. Terminals in the schematic and package pins are nothing but add some things a simple frame, so the probability is great pins do not match. In AD was often called pinmap do not match.
First locate, find J6.
Open the package at a glance, are the legs of the power supply terminal. Schematic painted on the tripod.
Back to the schematic, right-click the device, select edit part into the schematic interface.
Painting a painting, into the legs. Then pressing operation shown in FIG updated in real time to the schematic.
Then modify the encapsulation of the principle according to FIG:
more new netlist, the netlist guide. Component according placed on the step of the operation.
View, determine the placement has been completed.
Key K1
In general, the key is often a schematic two-terminal structure (similar to a switch). But the real key in the pin structure than many get away with only two pins, so here is the first suspect package.
The two-terminal device into a package.
Because nothing to do with the package itself netlist, after it has been saved directly to the pcb editor k1 is placed inside out on it.
Power chip U11
AMS1117 structure is very simple power chip, so the schematic is generally not a problem.
So you can go directly to view the package:
According to the diagram shown in the modification is completed and then added to the pcb. You can see the finished components have been added.
