Shulou(Shulou.com)06/03 Report--

1) ERC reports that the pin does not have an access signal:

a. The Icano attribute is defined for the pin when the package is created.

b. Inconsistent grid attributes were modified when the component was created or placed, and the pin was not connected to the wire

c. When creating a component, the pin direction is in the opposite direction and must be connected at the non-pin name end.

2) components run outside the drawing world: no components are created in the center of the catalog chart paper.

3) the project file network table created can only be partially called into pcb: when generating netlist, it is not selected as global.

4) when using multi-part components created by yourself, never use annotate.

Common errors in 2.PCB:

1) report that NODE was not found when the network was loaded:

a. The components in the schematic use encapsulation that is not available in the pcb library

b. The components in the schematic use encapsulation with inconsistent names in the pcb library

c. The components in the schematic use pin number inconsistent encapsulation in the pcb library. For example, in transistor: pin number in sch is ememy bpgc, while in pcb it is 1pdm 2pr 3.

2) when printing, you can never print to one page:

a. The pcb library was not created at the origin

b. The component has been moved and rotated many times, and there are hidden characters outside the boundary of the pcb board. Select to show all hidden characters, shrink the pcb, and then move the characters within the boundary.

3) the DRC reporting network is divided into several parts:

Indicates that the network is not connected, look at the report file and use Select CONNECTED COPPER to find it.

In addition, try to use WIN2000 to reduce the chances of blue screen; export files more times to make new DDB files, reduce file size and the chance of PROTEL being dead. If you make a more complex design, try not to use automatic routing.

In PCB design, routing is an important step to complete product design. It can be said that the previous preparatory work is done for it. In the whole PCB, the design process of routing is the highest, the skill is the smallest, and the workload is the largest. PCB routing includes single-sided routing, double-sided routing and multi-layer routing. There are also two ways to wire:

Before automatic routing and interactive routing, the lines with relatively strict requirements can be routed interactively in advance, and the edges of the input terminal and the output terminal should be avoided to be parallel to each other so as to avoid reflection interference. If necessary, ground wire isolation should be added, and the wiring of the two adjacent layers should be perpendicular to each other, and parallelism is easy to produce parasitic coupling.

The routing rate of automatic routing depends on good layout, and the routing rules can be set in advance, including the bending times of the route, the number of through holes, the number of steps, and so on. Generally, we first carry out exploratory warp wiring to connect the short lines quickly, and then carry out labyrinth routing. First, we optimize the global routing path of the wiring to be routed. It can disconnect the routed lines as needed and try to re-route them to improve the overall effect.

It has been felt that the through hole is not suitable for the current high-density PCB design, and it wastes a lot of valuable wiring channels. in order to solve this contradiction, blind hole and buried hole technology have appeared, which not only completes the function of through hole, but also saves many wiring channels to make the wiring process more convenient, more smooth and more perfect.

PCB platform: http://bbs.16rd.com/forum-39-1.html

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