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Basic questions about Allegro PCB Editor

momo1982

Hi all,

 I am beginer of Allegro PCB editor, and have spent around one week's full time on it. Here are some question which have confused me. I would appreciate if you can help. The questions are based on the PCB figure in the attachment.

The 2-pin header footprint is made by myself. The procedure is following the standard one: padstack to define pads --> package symbol to define footprint. Here are questions:

(1) After I placed the 'Package Boundary' when designed the footprint, the footprint is covered by a net full of dots, as you can see in the figure. This looks really uncomfortable! Any one knows how to remove the dots in it?  I have tried through 'Color/Visibility -- Stipple Patterns', and seems no help.

(2)  As you can see, the font (size, line width) of pin number, device reference (H, HEADER) are the same, which also looks ugly. Is there any method to modify these fonts individually?

 

(3) There is a via above the footprint. It is just a 'Via' in default library without any further information. What I want to ask is: is there any method to define a via when I am layout, as is supported by all other tools? I know I can select a PRE-defined Via by padstack when layout, but is there any method to define a via just in PCB editor interface? PRE-define EVERY via I will use is terribly inconvenient, because in some complex PCB, there could be tens,even hundreds, of vias with different size. PRE-define them one by one in padstack is terrible to manage.

 (4) In the Color/Visibility menu, there are tens of layer listed. However, most tutorials only talks about few of them, and left most of other layer unclear to me. Is there any document talking about this with more information?

 I have went through the whole Allegro Layout Tutorial on the software, and I didn't get most of the information I want. Why it is called tutorial? It is not, definitely...

 Thanks you all ~~

 

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  • oldmouldy

    The "dotted" pattern indicates a static shape, as opposed to a dynamic shape, you can get a static shape to "fill solid" through Setup>User Preferences, Display, OpenGL, set Static_shapes_fill_solid.

    The Text is controlled by Text Blocks, a Text Block assigns the parameters for the text, including the size of the box that the text is drawn in. Setup>Design Parameters, Text, Setup text sizes. If the Photoplot width is 0, the text elements will be drawn with a single pixel.

     You can use Tools>Padstack>Modify .. Padstack to get the Pad Designer running from within PCB Editor. If you are not modifying an existing padsatck, you will need to use File>Save and save the new padstack to you $padpath for it to be "visible" to the design. Any padstack can be a via, you probably don't need a huge list of "core" vias, you can make Blind / Buried vias for the design, as required, from Setup>B/B Via Definitions, pick an existing via and you can define the layers the new BB via spans.

    The tutorial is an overview introduction, the lower level details are available from the Cadence Help application, this is running against the directories in the doc directory of the installation. The "algro..." directories cover specific aspects of PCB Editor, the "?coms" describe the PCB Editor commands and options by alphabetic character - acoms describes all the commands beginning with a for example - other directores cover some specific topics like "cm.." for the constraint manager; depending upon what you are looking for, you may find either the Cadence Help application, or directly looking in the doc directory more convenient. It's pretty unlikely that anyone would want, or need, to follow a tutorial that worked through every aspect of the PCB Editor tools. (By the way, the "layers" in the design are "subclasses" and grouped into "classes", the "classes" are fixed but you can add as many "subclasses" are required)

Reply
  • oldmouldy

    The "dotted" pattern indicates a static shape, as opposed to a dynamic shape, you can get a static shape to "fill solid" through Setup>User Preferences, Display, OpenGL, set Static_shapes_fill_solid.

    The Text is controlled by Text Blocks, a Text Block assigns the parameters for the text, including the size of the box that the text is drawn in. Setup>Design Parameters, Text, Setup text sizes. If the Photoplot width is 0, the text elements will be drawn with a single pixel.

     You can use Tools>Padstack>Modify .. Padstack to get the Pad Designer running from within PCB Editor. If you are not modifying an existing padsatck, you will need to use File>Save and save the new padstack to you $padpath for it to be "visible" to the design. Any padstack can be a via, you probably don't need a huge list of "core" vias, you can make Blind / Buried vias for the design, as required, from Setup>B/B Via Definitions, pick an existing via and you can define the layers the new BB via spans.

    The tutorial is an overview introduction, the lower level details are available from the Cadence Help application, this is running against the directories in the doc directory of the installation. The "algro..." directories cover specific aspects of PCB Editor, the "?coms" describe the PCB Editor commands and options by alphabetic character - acoms describes all the commands beginning with a for example - other directores cover some specific topics like "cm.." for the constraint manager; depending upon what you are looking for, you may find either the Cadence Help application, or directly looking in the doc directory more convenient. It's pretty unlikely that anyone would want, or need, to follow a tutorial that worked through every aspect of the PCB Editor tools. (By the way, the "layers" in the design are "subclasses" and grouped into "classes", the "classes" are fixed but you can add as many "subclasses" are required)

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