2024年6月11日发(作者：)

PADS9.2

基础速成教材

Step 1 - Create a Board Outline

Board outlines are created using the drafting tools. The drafting tools are located in the Drafting toolbox.

To create a board outline:

1. In the Welcome screen, click Start a new design.

2. Click the Drafting Toolbar button.

. 3. On the Drafting toolbar, click the Board Outline and Cut Out button

4. Right-click and select your shape preference.

5. Draw an outline using the pointer, making a series of clicks.

6. Click to complete a rectangular or circular outline. Double-click to complete a polygonal outline.

Step 2 - Import a Netlist and Disperse Parts

Typically, net and part design data originate in a schematic capture application and are transferred to a

layout application via an ASCII netlist. Use the Import command to import ASCII files into your design.

To import a netlist:

1. On the File menu, click Import.

Tip: Save the design when you are prompted to.

2. In the File Import dialog box, click the file type to import from the Files of type list.

3. Navigate to the file to import, and click Open to import the file.

4. Review any errors or warnings, in the file, that may result from the import process.

After you import nets and parts into your design, disperse the parts around the outside of the board using

the Disperse components command.

To disperse parts:

1. On the Tools menu, click Disperse Components.

2. Click Yes to confirm the dispersion of the parts.

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Step 3 - Setup Design Rules

Setup all design rules, including clearance, routing, high-speed and others, within the design rule dialog

boxes.

To setup design rules:

1. Setup menu>Design Rules.

2. Click the Default button.

Result: The Default Rules dialog box appears. Use this dialog box to select the type of default rule

to enter. See the table below for more information.

3. Click the Clearance button to enter default clearance rules.

4. Click in any one of the boxes in the matrix to change its value.

5. Click OK to apply the clearance rule changes.

6. Click any other button to set default rules for the associated type.

7. Click Close to close the Default Rules dialog box.

8. Click Close to close the Rules dialog box.

Table 1-1 lists and describes the rules types:

Table 1-1. Design Rules Types

Rules Type

Clearance

Includes rules or preferences for

Minimum clearance, minimum same net clearance, trace width, drill-to-drill and part

body-to-part body minimum clearances.

Routing

High Speed

Trace topology, copper sharing, layer bias, via bias, and trace protection level.

Parallelism, shielding, and thresholds for trace length, delay capacitance, and

impedance.

Fanout

Pad Entry

Conditional

Fanout construction (used in PADS Router only).

Trace patterns at pad entries and exits (used in PADS Router only).

Overriding unique conditions when specific design objects are adjacent to other

specific design objects. The rules include minimum clearances and parallelism.

Differential

Pairs

Net length and topology of differential pairs.

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