Reverse Engineering Printed Circuit Board Restriction Terms

Reverse Engineering Printed Circuit Board Restriction Terms must be set to ensure the accuracy of PCB board layout, gerber file and schematic diagram, automatic layout can achieve the expected results, anyway, modification and adjustment on these works,

at the same time, it is also required to ensure other signals and network layout space. After part of PCB board reverse engineering test structure has been done, engineer can fix them to avoid the incoming affect on them. Use the same procedures to layout the rest signals.

The quantity of layout times depends on the complexity level of the Printed circuit board and defined general rules. After a kind of signal has been completed, the rest network layout restriction terms will be decreased. Accompany with the increasing of manual intervention of rest signal lines. Current automatic layout tools are all very powerful, and can normally finish 100% Printed circuit board design drawing. Only when the automatic layout function can’t complete all of the signals layout, it is time to use manual layout.

The key point of automatic layout include:

1, modify the installation gentally, and try to use multiple route layout;

2, keep the basic rules and try to use different layout layer, circuit tracks and various track width, different types of through holes like blind vias/buried vias,etc, monitor the affection of these variation on the layout;

3, use layout tools to process the network according to the requirement;

4, the less importance of the signal line, the more freedom it can obtain from the automatic layout tools;

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