Task 5: Assigning Topology Templates
In this topic, you will assign the topology template to the relevant E-Nets and Differential Pairs.
- Using the MyHSDesign1.pdes design from the previous topic, ensure that the View box in Constraint Browser is set to E-Net.
Figure 1: Constraint Browser
- In the Signals tab in Constraint Browser, select the bus "LPDDR2_CA[0-9]".
- Select the Design Rule tab as shown below, and select all signals in the Topology Template column.
Figure 2: Constraint Browser
- Point the cursor in the Topology
template cell shown below, and click the displayed
button. The Assign Topology
Template dialog is displayed.
Figure 3: Constraint Browser
- In the Assign Topology Template dialog, ensure that all signals are selected that are associated with the LPDDR2_CA[0-9] bus.
Figure 4: Assign Topology Template Dialog
- Ensure that the Single_Ended_H-Tree topology template is selected.
- Ensure that the contents of the Assign components to each node section matches the above image.
- Click Apply to assign the topology to the selected signals.
Figure 5: Assign Topology Template Dialog
- Following the same procedure as described above, assign the following topologies to the nets.
| Signals | Topology |
|---|---|
| LPDDR2_CKE [0-1] (E-Nets) | Single_Ended_H-Tree_Near_End_Terminator |
| LPDDR2_CLK_C-LPDDR2_CLK_T (Differential Pair) | Differential Pair_H-Tree |
- When all topologies are assigned, save the design. Virtual branch points should now be visible on the canvas, and can be interacted with.
Figure 6: Virtual Branch Points
The above procedures are demonstrated in the following video.
