This article provides a comprehensive guide on how to perform PCB layout using Cadence Allegro. The process starts with designing the schematic in Design Entry CIS (Capture), which is the first step in creating a complete electronic design.
**1. Create a Project**
To begin, go to **File > New > Project**. Enter a project name and specify the path where you want to save it. This sets up the foundation for your entire design.
**2. Set the Operating Environment**
Navigate to **Options > Preferences** to configure your workspace. You can adjust settings such as color, grid display, and miscellaneous options. Most of these settings can be left at their default values unless specific customization is needed.
**3. Configure the Schematic Drawing**
Set the template by going to **Options > Design Template** and apply it to new drawings. Then, set the current drawing properties via **Options > Schematic Page Properties**. These settings help maintain consistency and clarity throughout your design.
**4. Create Components and Component Libraries**
Start by creating a new library under **File > New Library**, and then add it to your project. To create components, go to **Design > New Part** or right-click the library and select **New Part**. You can choose between **homogeneous** and **heterogeneous** component types depending on whether the package contains identical or different parts. You can draw the package shape using the **Place > Line** tool and add pins with **Place > Pin**.
**5. Draw the Schematic**
Begin by placing components using **Place > Part**. You can choose from the design cache, existing libraries, or built-in libraries. Add power and ground symbols from the right toolbar. For wiring, use **Bus** connections with proper net aliases. For multi-sheet designs, use **Circuit Port Connectors** or **Hierarchical Blocks** to manage complex schematics.
**6. PCB Layer Preprocessing**
Before moving to the PCB layout, ensure that all components have the correct **PCB Footprint** assigned. Open the **Edit Properties** window and make sure the footprint names match those in the Allegro PCB library. You can also define custom attributes like component categories and room definitions.
**7. Post-Processing of the Schematic**
After completing the schematic, perform a **Design Rule Check (DRC)** via **Tools > Design Rules Check**. This helps identify any errors in the design. You can check the entire design or selected elements and generate a detailed report. Next, use **Tools > Annotate** to automatically number components. Finally, update component or network properties using **Tools > Update Properties**.
**8. Generate the Netlist**
Once the schematic is verified, go to **Tools > Create Netlists** to generate the netlist. This file will be used in the PCB layout phase to transfer all design information to the board.
This step-by-step guide ensures a smooth transition from schematic design to PCB layout, making the process efficient and error-free. Whether you're a beginner or an experienced designer, following these steps will help you master Cadence Allegro's powerful features.
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