Q1: What is a part package, and what is the difference between it and the part? 
answer
(1) Part packaging refers to the appearance and solder joint position indicated when the actual part is soldered to the board.
(2) The part package is only the appearance of the part and the position of the solder joint. The pure part package is only the concept of space, so different parts can share the same part package.
On the other hand, the same kind of parts can also have different packages, such as RES2 for resistance, its package form is AXAIL0.4, AXAIL0.3, AXAIL0.6, etc., so when you use welding parts, you must not only know the parts. The name also knows the package of the part.
　　
(3) The package of the part can be specified when designing the circuit diagram, or when the network table is introduced. When designing a circuit diagram, you can specify it in the Footprint setting item in the part properties dialog box, or you can specify the part package when you introduce the network table.
Q2: What is the difference between wires, flying lines and networks?
answer
Wires, also known as copper film traces, referred to as wires, are used to connect individual solder joints and are the most important part of a printed circuit board. The printed circuit board design is all about how to arrange the wires.
Another type of wire associated with a wire is often referred to as a flying wire, also known as a pre-tensioning wire. The flying line is a connection that is generated by the system according to the rules after the introduction of the network table, and is used to guide the wiring.
Flying lines and wires are essentially different. The flying line is just a form of connection. It only shows the connection relationship between the solder joints in a form, and there is no electrical connection. The wires are arranged according to the connection relationship between the solder joints indicated by the flying wires, and the connecting lines have electrical connection meaning.
The network and the wires are different. The network also includes solder joints, so when referring to the network, not only the guide wire but also the solder joints connected to the wires.
　　
Q3: What is the difference between the inner and middle layers?
answer
The middle and inner layers are two confusing concepts. The intermediate layer refers to an intermediate layer for wiring, in which a wire is laid.
The inner layer refers to a power layer or a ground layer, which is generally not wired, and is composed of a whole copper film.
Q4: What is the internal network table and the external network table, what is the difference between the two?
answer
The network table has an external network table and an internal network table. The external network table refers to the introduced network table, that is, the schematic network table generated by Sch or other schematic design software.
The internal network table is a network table that is used by the PCB system for wiring according to the imported external network table. Strictly speaking, these two network tables are completely different concepts, but the readers do not have to be strictly distinguished.
　
Q5: What is the role of the Network Table Manager?
answer
(1) Introducing a network table. The introduction process of such a network table is actually a process of loading data of a schematic design into a PCB of a printed circuit board design system.
All changes to the data in the PCB design system can be done through the Netlist Macro. The system automatically generates network macros by comparing and analyzing the internal data of the network table files and the PCB system.
(2) The network table manager can be used to directly edit the connection relationship between the various components of the circuit board in the PCB system to form a network table.
　
Q6: What is a class, and what are the benefits of introducing the concept of a class?
answer
A class is a collection of cells that have the same meaning. The class definition in the PCB is open to the user, and the user can define the meaning of the class and the composition of the class. Introducing classes in PCB has two main functions:
(1) Facilitating wiring F During the circuit board wiring process, some networks need special processing. For example, some important data lines need to increase these data lines and other wiring in order to avoid interference from other components on the circuit board. Safe spacing between components.
These data lines can be grouped into one class. This class can be added to the rules when setting the automatic routing security spacing rules, and the safety spacing is appropriately increased. When automatically routing, the safety spacing of all the data lines in this class is safe. Was enlarged.
During circuit board layout, the power and ground lines often need to be thickened to ensure the reliability of the connection. The power and ground lines can be grouped into one class. When setting the automatic routing wire width rule, you can add this class to the rule. And the wire width is appropriately increased, and the power and ground wires in this class are widened when the wiring is automatically performed.
(2) Easy to manage circuit board components F For a large circuit board, there are many parts and components on it, and there are thousands of networks, which are very messy, and the board can be conveniently managed by using the class.
For example, to classify all the input networks in the board, when looking for an input network, just look in the input network class. It is also possible to classify the finite resistors in the board. When looking for a voltage limiting resistor, you only need to find it in this voltage limiting resistor class.
　　
Q7: How do I add additional solder joints to the network?
answer
You can add solder joints to the board first, then double-click the solder joints, open the solder joint property setting dialog box, and select the appropriate network in the Net item in Advaced to complete the solder joint placement.
Q8: What is the use of inner segmentation?
answer
The split inner layer can be used to connect some important lines, which can improve the anti-interference ability and protect the important circuits.
　　
Q9: What is the role of copper? What should I pay attention to?
answer
The main function of copper is to improve the anti-interference ability of the circuit board. If the wire is to be wrapped or the teardrop is to be applied, the copper should be placed at the end.
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