Figure 1. Single-Ended Output Buffer Primitives
| Attribute | Values | Description |
|---|---|---|
| SLEW | SLOW, FAST, MEDIUM | Specifies the slew rate of the output. |
| DRIVE | 2, 4, 8, 12 | Specifies the drive strength of the output. |
| IOSTANDARD | See XP IOB Supported Standards | Assigns an I/O standard to the element. |
| Port | I/O | Description |
|---|---|---|
| O | Output | Output of OBUF to be connected directly to top-level output port. |
| I | Input | Input of OBUF. Connect to the logic driving the output port. |
| T | Input | Tristate enable input. (OBUFT only) |