9.4.10.1 Modifying Boundary Scan Registers

Each I/O in your device is comprised of an Input, Output and Output Enable Boundary Scan Register (BSR) cell.

The BSR cells enable you to define I/O states during programming and control the individual states for each Input, Output, and Output Enable register.

To modify the individual Boundary Scan Registers of an I/O in your device:

1. Select the Show BSR Details checkbox in the Specify I/O States During Programming window. This replaces the I/O State (Output Only) column with a Boundary Scan Registers column that is split into Input, Output Enable and Output.
2. Modify each of the registers for any I/O to set your custom options. For an explanation of the individual BSR settings, see the Specifying I/O States During Programming - I/O States and BSR Details section.
3. (Optional) Uncheck the Show BSR Details checkbox to return to the default view.
   Note: Updated I/Os with non-default settings are displayed as User-Defined BSR in the default view.
4. Click OK and complete programming to save your updated settings to the ADB and programming files.