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Allegro Free Viewer 15.0. Installation Download from http://www.cadence.com/products/si_pk_bd/downloads/allegroviewers/index.aspx Opening Files Allegro opens PCB files with a .brd extension Simply select File->Open and navigate to the board file that you want to look at.

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allegro free viewer 15 0
Allegro Free Viewer 15.0
  • Installation
    • Download from http://www.cadence.com/products/si_pk_bd/downloads/allegroviewers/index.aspx
  • Opening Files
    • Allegro opens PCB files with a .brd extension
    • Simply select File->Open and navigate to the board file that you want to look at
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Allegro Free Viewer 15.0
  • Setting up the view
    • Always best to start with a clean slate
    • This example sets up the board for viewing from the top side
    • Typically, start by zooming to fit the board to the window
    • Also probably want to turn off the grid dots if they are on
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Allegro Free Viewer 15.0
  • Click zoom-fit or hit F9 to see the whole board
    • Click on grid toggle, or hit Shift-F9 to toggle grid off
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Allegro Free Viewer 15.0
  • Setting up the view
    • Next, we need to clear the screen of the last-saved view settings
    • Select Display->Color/Visibility
    • Set Global Visibility to “All Invisible” and hit apply
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Allegro Free Viewer 15.0
  • Select Display->Color Visibility and set to “All Invisible”
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Allegro Free Viewer 15.0
  • Setting up the view
    • Select Group = Geometry and scroll down to check boxes next to
      • “Outline” under Board Geometry
      • “Silkscreen_Top” under Board Geometry
      • “Silkscreen_Top” under Package Geometry
      • “Assembly_Top” under Package Geometry
    • Then select “Apply”
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Allegro Free Viewer 15.0
  • Turn on the listed Geometry layers
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Allegro Free Viewer 15.0
  • Setting up the view
    • Select Group = Stack-Up and scroll down to check boxes next to
      • “Top” under Pin
      • “Top” under Via
      • “Top” under Etch
    • Then select “Apply”
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Allegro Free Viewer 15.0
  • Turn on the listed Stack-Up layers
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Allegro Free Viewer 15.0
  • Layers
    • Allegro board files consist of many “layers”
    • There are, for example, “etch” layers which are the actual copper connections
    • There are also soldermask and silkscreen layers which correspond to the green outer coating and white labeling respectively
    • And, there are other information-only layers that show dimensions, part outlines, etc.
    • You will typically be focusing on the etch layers
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Allegro Free Viewer 15.0
  • Layers
    • There is a quicker way to set visibility for etch layers
    • On the right hand side of the window there is a tab for “Visibility”
    • You can use this to turn on and off signal and plane layers and the vias and device pads for those layers
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Allegro Free Viewer 15.0
  • Finding Nets
    • You will normally want to look at a signal or set of signals, referred to in Allegro as “nets”
    • To find a net, you can highlight it
    • There are two ways to highlight
      • Show Element (Temporary)
      • Hilight (Must Dehilight to turn off)
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Allegro Free Viewer 15.0
  • Finding Nets
    • After selecting either “Show Element” or “Hilight”, select the Find tab on the right
    • Under “Find By Name” type in the name of the net and hit enter.
    • You may use * as a wildcard if you are uncertain of the full net name or if you want to highlight a group of nets
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Allegro Free Viewer 15.0
  • Finding Nets
    • Show Element will bring up an information window, zoom to the net, and highlight it
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Allegro Free Viewer 15.0
  • Finding Nets
    • Highlight will simply zoom to the net, and highlight it
    • You must use “De-highlight” to turn off the net highlighting
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Allegro Free Viewer 15.0
  • Finding a group of nets
    • As mentioned, you can find multiple nets at once using a * as a wild-card
    • For example, most clock signals include “CLK” as part of the net name.
    • To find all clocks that have “CLK” in the net name, you can type in “*clk*” in the find filter
    • This will highlight all such nets
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Allegro Free Viewer 15.0
  • Hilight Color
    • You can change either the Temporary (Show Element) or Permanent (Highlight) colors
    • Again select “Display-> Color/Visibility” then change Group to “Display”
    • Click on the color you want from the palette and select the colored box next to the appropriate highlight type
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Allegro Free Viewer 15.0
  • Finding and following long nets
    • Long nets that span a large section of the board will be hard to see when Allegro zooms to fit the net
    • After highlighting one of these nets, you will need to zoom in manually
    • Look in the lower right corner and you will see a miniature display of the board outline along with the highlighted net.
    • Click and drag a box around the net in this window to zoom in on it
    • Then click on “Zoom Points” to allow you to draw a box around the highlighted item in the main window and zoom in further
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Allegro Free Viewer 15.0
  • Finding and following long nets
    • After you have zoomed in on the net you will want to turn on all signal etch layers and shadow mode to make the net stand out
    • First, go back to the Visibility tab on the right and check the box under “Etch” and next to “Conductors”
    • Next, select “Display->Color/Visibility”, then the “Display” Group and turn Shadow mode “On”, check the box to “Dim active layer” and hit “Apply”
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Allegro Free Viewer 15.0
  • Finding and following long nets
    • To follow the net, or to pan in general, press and hold the middle mouse button and drag your cursor in the main viewing window
    • In this way you can follow the net where ever it goes
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Allegro Free Viewer 15.0
  • Finding etch length
    • If you need to know the length of a net or a part of a net, you can get that information from the window that appears when you use “Show Element”
    • If you use Show Element for a net, the window will list the entire net length
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Allegro Free Viewer 15.0
  • Finding etch length
    • If you want to find the length of a section of the net, you can get either Cline or Cline Segment lengths.
    • A Cline is any part of a net that routes on a single layer until it runs into a pin, via, or other feature.
    • A Cline segment is any part of a net that routes on a single layer until it runs into a bend, pin, via or other feature. Basically, any single straight segment.
    • This time, select Show Element, but instead, check the box for Cline or Cline Segment and the click on the segment you want to measure.