To configure fabric pins in open-drain mode, the input port of the tristate buffer must be tied low, and the enable port of the buffer must be driven from the user logic via the fabric port, as shown in the following figure. For more information about the bank supplies, see Table 1, Table 4, and Table 1.
Figure 1. Configuring Pins in Open
Drain
The following table lists the truth table for configuring pins in open-drain mode.
| Buffer Enable Port | Buffer In Port | Buffer Out Port |
|---|---|---|
| 0 (low) | 0 (low) | 0 (low) |
| 1 (high) | 0 (low) | VDDIX |