Task 3: Defining the Topology Templates

In this topic, you will define the topologies that are required to route the design, whilst adhering to the DDR2 specification.

1. Using the MyHSDesign1.pdes design from the previous topic, launch Constraint Browser from the Home tab on the eCADSTAR PCB Editor ribbon.
2. In Constraint Browser, click Edit > Topology Template Manager on the menu, or click the Topology Template Manager button on the ribbon. The Topology Template Manager is launched.
3. In the Topology Template Manager, click the Create a new topology template button shown below.

Figure 1: Topology Template Manager

The Create Topology Template dialog is displayed. This is a pre-defined topology list for creating topologies.

 Figure 2: Create Topology Template Dialog

4. From the predefined topology template list, select “DH-Tree”.
5. Set the Number of inputs value to “2”, and change the Name value of the topology to “Differential_Pair_H-Tree”.

Figure 3: Create Topology Template Dialog

6. Click OK to save, and close the Create Topology Template dialog.

Figure 4: Topology Template Manager

7. Using the same method, create a second topology template using the “H-Tree” template from the topology. Set the Number of inputs value to “2”, and change the Name value of the topology to “Single_Ended_H-Tree”.
8. Click OK to create the topology.

Figure 5: Topology Template Manager

9. Right-click the “Single_Ended_H-Tree” topology, and select Copy. This will be used to create another single-ended H-Tree topology, but this time with termination.

Figure 6: Topology Template Manager

10. Double-click the topology, and change the name to “Single_Ended_H-Tree_Near_End_Terminator.

Figure 7: Topology Template Manager

11. In the Topology template image, select the transmission Line "TL1".
12. Right-click, and select Insert > Insert Column Right.

Figure 8: Topology Template Manager

13. Repeat the above action two more times. Three blank columns are created between the output node and transmission line.

Figure 9: Topology Template Manager

14. Using the toolbar, drag nodes onto the topology. Include a near-end terminator to complete the topology. The completed topology is shown below.

Figure 10: Topology Template Manager

15. Click Apply to save the topology, A confirmation dialog will appear, Click OK and then close the Topology Template Manager.

The above procedures are demonstrated in the following video.