Cadence learning path (VIII) PCB placement components

1. preparation

Before placing components , Make sure your two paths are correct ：

  If you are imported from the first-party weblist （ Use Allegro Export netlist ） So pay attention to padpath and psmpath If the path is correct , If you are a third-party software （AD、 Lichuang ） Imported netlist , Then you should pay attention to devpath The path is correct .

2. Quickly place components

Place - Quickplace You can enter the following interface , My interface is Chinese ：

  Because I am. 17.4 edition , You can directly click to place , If you are a lower version Cadence, You need to draw the board and frame before placing , We talked about that before 17.2 Version import board frame , Let's introduce 17.4 Import board frame ：

3. Draw a board and frame by yourself ：

Choose to place a rectangle ,17.4 Then place it on the lower layer

 4.Cadence17.4 Import board frame

Import DXF Note that the path should not use Chinese or special characters ：

  Next, set the mapping of layers , If your DXF If the file has multiple layers, you must set the mapping , Otherwise, you cannot import , As shown in the above figure, the import button is gray

As shown in the figure below, import succeeded ：

 

5. The board and frame are changed to the corresponding layer

①Edit - change , And then in find Select... In the panel shapes Can be related to each other ,

② Set the layer you want to change ： You must tick

  Then left click your board frame to move to the corresponding layer .

6. Place components -- Precise positioning

The following figure shows the package after I rotate , But we can't accurately place it in the board and frame area in the figure

  Next, we use the center of the circle to accurately align ： First select the move button , Then right click on the center of the board frame and select the following ： choice sym origin The system selects the reference point

 

  Of course, you can also use line segment positioning , You need to choose User pick  User specified point , Select a wire of your device , Select segment vertex alignment , Then select the line of the board frame you want to align , When selecting segment vertices, select their options , It can be .

 

7. It can also be placed by coordinates , But it's more troublesome , adopt show element Know the coordinates of both , Select the device , Enter the coordinates you selected , Then enter the coordinates of where you want to go , Use the command line .

8.Capture And PCB Editor Interactive layout

First, in the Capture In software Option - preference -  Check the following options  

And only the first party netlist can interact , Import the net list again .

stay PCB Design Select move Symbol, That is, mobile devices , Interaction can be realized , Go to Capture Select device ,PCB Will highlight , Double click to move .  You can also choose the network , Or vice versa PCB-- Schematic diagram selection .

9. The display of flying line is closed

  hide GND Fly line

stay find Choose from nets The Internet , choice GND,Edit - properties Set the voltage to 0V You can hide the fly line

 

In the same way , We can hide 3V3 Flying wire of power supply

alike , We need to show , Just remove the previously set value .

10. Module reuse

Reuse the connection layout of the left figure to the right figure

  First, choose the layout mode , Select all devices on the left symbol,place replicate create

  End of choice Done, Click any point inside the module with the left mouse button as the center point , You can save .mdd file

Next, select the right device ,apply You can call .

 11. Add vias

All Layers find vias Option add via , Double click the left mouse button when routing to drill holes , Two rows of fans are recommended for punching .

12. Add differential pairs manually

Logic - Assign Differential Pair, And then in PCB Add a differential pair by selecting pins in , After the addition, they will be wired together

  You can also add... Directly in the rule manager