21.6.4 Adding an Output Delay Constraint

To add an output delay constraint, perform the following steps:

1. Click the Add Output Delay Constraint icon in the SmartTime toolbar. The Set Output Delay Constraint dialog box appears.

   

2. In the Show by field, select Clock-to-Output.
3. Click the Browse button in the Output Port field to select the ports for the output delay constraint. The Select Ports for Output Delay dialog box appears and displays the output ports in the design (as shown below).
4. Click Add All to select all the output ports. SmartTime moves the output pins from the Available Pins list to the Assigned Pins list.
5. Click OK to close the Select Ports for Output Delay dialog box.

   

6. Select Clock from the Clock Port drop-down list.
7. Enter 10 in the Maximum Delay field and 8 in the Minimum Delay field.
8. Click OK to close the Set Output Delay Constraint dialog box. After the dialog box closes, the clk-to-out delay constraints appear in the SmartTime Constraint Editor (as shown below).

   

You must commit your changes in SmartTime before you can analyze timing in your design. Click the Commit icon in the SmartTime toolbar to save your constraints.

You are ready to analyze your design.