Cadence (x) wiring skills and precautions

Catalog

1. It is forbidden to connect power line and ground line

 2. You can select multiple networks to run together ：

 3. Precautions for punching

4. Show the power supply you have forbidden and GND The Internet

5. Copper laying in power supply area

6. We can also use shape - Edit Boundary To trim the copper border . 

7. paving

8. Last , We make use of shape - dellete island Delete Island copper

1. It is forbidden to connect power line and ground line

When we first started the line , You will find many flying lines , Mainly GND There are many flying lines with the power network , therefore , In addition to the previously mentioned hidden routing, there are also settings to prohibit routing .

Click on Edit - properties, After the find The panel only checks net Options , Then you select the flying wire pin you want to prohibit , The following window will pop up ：

Set... In the above window Voltage The value of is 0 It is forbidden to route , The effect is as follows ：

So even if you show all the flying lines , This GND And VB The fly line will not show , The wiring can be well completed by cooperating with some of our display flying wires . Of course, it's easy to cancel , The previously set 0 Delete it . 

Although you have banned the above Networks , But if you want to go online, it can still go , For example, when we are processing the crystal oscillator package , Ground wire is required , You can also learn from GND Pin leads out ：

 2. You can select multiple networks to run together ：

The three lines in the figure below do not go alone , But go online together

 3. Precautions for punching

The routing of the bottom layer of the double-layer board is shown in the figure below. You can try to route multiple networks in the same direction , And I think keeping symmetry is a good habit . 

On the surface, you only need to punch a through hole , But in fact, one of these two lines is a clock line and the other is a data line , The same communication protocol belonging to the chip , Therefore, the optimal solution is to be as symmetrical as possible .

4. Show the power supply you have forbidden and GND The Internet

As we learned earlier, it is forbidden to connect power and ground networks to facilitate our wiring , After we draw other networks , It is necessary to display the power and ground network , The operation is as follows ：Edit - properties, Then select the network we want to display , Delete Voltage Options can be ：

5. Copper laying in power supply area

Copper laying in the area is the necessary connection mode of power supply , The operation is as follows ： place shape - polygon polygon

Next, set the connection of this area  

  Then select copper sheet , Right click selection Assign net, Then click the network you need to connect to complete the connection .

It can be found that he is connected by wires , How to change it to overlay connection ？

shape - global Dynamic params

6. We can also use shape - Edit Boundary To trim the copper border . 

In the process of wiring , There will be situations that make you very depressed , Is that you want to rewire , You want to delete that line , But use delete You will delete the entire corresponding network , So there is a trick , First use the line segment you want to delete Move button Move to a separate area , And then delete , Is it very practical ！

7. paving

Connect and divide GND After all wiring except , We began to pave the floor ：

The premise is that you have to set it up Router Keepin Must be at the bottom bootom, So your copper area is keepin Inside . The operation is as follows ： Select the rectangle Rectangle - Box directly , Then use assign net choice GND Network is OK

Note that after selecting the rectangle , Set the selected layer as the bottom layer , In this way, the copper is laid on the bottom .

  Then we punch all the pads ！ All of them ！

  After using us Z - copy Copy the copper sheet to the surface layer , Pay attention to the options ：

find The panel only selects shape, The parameter panel is as follows

  Click copper laying to copy , In this way, the top layer will also be covered with ground copper ！ The effect is as follows ：

Last , We Display - Status Check whether your wiring is complete , see DRC, Check the island

We can see DRC Yes 30 individual , Just display it in the color manager . 

And I appear most DRC The mistake is Place Bound coincidence , The following error will be reported ： 

We choose to move , Check... At the same time Slide etch Then the device and wiring move together .

8. Last , We make use of shape - dellete island Delete Island copper

Before you delete, you need to see whether each island copper can be deleted .

  Of course, it is not necessary to delete , It is suggested to fill the floor hole ！ The final effect is as follows ：

It's pretty pink , Study Cadence The key is to stick to it , Its strength lies in PCB, It's convenient to use it for a long time .