Discussion on Several Issues in the Presupposition of New Type Printing Plate Materials

ProtelforWindowsPCBVer1.5 several features and use of attention

The copper layers provided include upper layers, lower layers, 14 intermediate layers, and 4 power ground layers. The non-copper layer is provided with one disabling wiring layer, upper and lower silk screen layers, and four mechanical layers. The layers that can be generated include upper and lower solder masks, upper and lower resist layers (for SMD), and drill layers.

Grid is used for position reference and cursor positioning.

ProtelforWindowsPCB supports VisibleGrid1, VisibleGrid2 and SnapGrid.VisibleGrid as the position reference for PCB design, and SnapGrid as the minimum interval for cursor positioning. VisibleGrid1 and VisibleGrid2 are displayed when the display window is larger and smaller. PFWPCB displays visible grids in two forms to suit different needs and personal habits. One of them is a real square grid, and the other is a grid point format.

Use Auto-Density to observe the fly line density after layout.

Modify the parameters of a network to set the line width and routing order of a network. The method is: In the PFWSCH operation Edit-Placedirectives-PCBLayout, then put a special symbol to the network you want to set (such as VCC or GND, etc.). It can then be edited and its parameter properties modified.

Auto-UnRoute can be used to automatically remove the line, automatically added vias, etc., the line does not remove the artificial cloth.

DRC error display function: Operate Options-Layers, select the check box before DRCErrors, then the result of DRC check will be displayed on the PCB diagram.

Ability to have online DRC: Operate Options-Preference, select the box before Online DRC, then the system will perform DRC verification automatically after placing, moving and other PCB editing operations.

Filled with a shield function: Place-PolygonPlane (Dialog 1), you can place a polygon fill area, that is to say the polygon area of ​​the current artificial circle is filled with horizontal and vertical lines, generally used for the design of ground lines, borders, etc. In 1, the selection box before ConnecttoNet is selected, and the placed polygon is in electrical communication with the network you specify. Select the check box before RemoveDeadCopper, then remove the copper foil after placing the polygon fill area.

Place-Dimension can label the distance between any two points on the PCB diagram. Info-MeasureDistance only shows the distance between any two points and does not place any content on the PCB.

Similar to the tangent function of DOS version of Protel's F7: Edit-Move-BreakTrack, you can add breakpoints to the selected line and move this breakpoint.

Batch modification function: PFWPCB has the function of batch modification of objects. The setting shown in Fig. 2 is to change all the packages that are the same as the package of the device and in the selected state to DIODE016. The pattern in the figure shows the package of the device. The package in PFWSCH is represented by English Footprint. The PlaceStatus in the figure has two placement states to choose from: FreeToMove and LockedInPlace. Selecting the former, the system does not move the component during automatic layout. Manually moving components has nothing to do with this setting.

In the figure, Wildcard can use 3 and UA.

After Netlist-EditNet is operated, use the cursor to click on the pad to which the flying line or flying line to be modified is connected. The dialog box shown in Figure 3 will pop up. In the figure, RoutingTrackWidth represents the line width used when auto-routing this network; RoutingViaDiameter represents the diameter of the via used when auto-routing this network. Generally, when the network is modified for the first time, the value of these two items is 0, which means the default line width and via size set in the auto-wiring function when the network performs automatic routing. If one or both of these two are changed to non-zero, the system will use the line width and via size here when auto-routing. This feature allows the system to route different networks with different line widths during automatic routing.

Before the automatic routing, the system can be told in multiple places, according to what strategy each network is routed (shortest path daisy chain, etc.). You can use PFWSCH to automatically set the connection parameters between two points when PCB is automatically routed. Place-Directives-PCBLayout, place a special icon, and then double-click it to modify Topology in the pop-up window. You can use PFWPCB, Netlist- EditNet, set the routing strategy when the network automatically routes.

You can use PFWPCB, Netlist-Optimize, to set the fly-line for the rest of the network that has not been edited to be the shortest route strategy.

In PCB design, it is seldom possible to place each component arbitrarily. In most cases, there are always several components that are pre-determined, such as power supplies, connectors, and so on. For these components, manually place it in a suitable place, and then modify the PlaceStatus column to make it LockedInPlace by modifying the operation of the component. In this way, the system will not move it during automatic layout.

Operate Auto-ManualRoute for manual wiring. In the wiring process, every time the hot key Backspace is pressed, it is equivalent to one Undo. Pressing the “ ” or “-” in the right keypad area Keypad can switch among all working layers. Press "3" in the right keypad area Keypad to switch between open copper layers. The system automatically recognizes whether or not to switch between the two copper layers. Whether or not to place vias automatically depends on the option AutoVia in the Options-Preference. The width of the manually-routed line width is the line width used when using PlaceTrace. Press Tab during this process to modify the line width, and press the SPACE key to switch the route.

Set the autorouter parameter: Auto-SetupAutoRoute. As in 4, SMDStringer indicates whether the SMD pad is enhanced. LineProbe indicates whether to use trial cabling.

Whether to add arc routing when wiring AddArcs. Maze said whether to use the maze wiring.

Smoothing indicates whether smooth wiring is used. Hugging can compact the wiring before the auto-wiring 100 is completed so that the lines are densely packed to make room for subsequent unwired wires. Spreading is performed after completion of the automatic wiring 100 so that the lines are evenly distributed.

21 General Steps for Board Design Using Protel for Windows PCB The board design steps are shown.

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