Primitive: Bidirectional I/O Buffer with Offset Calibration and VREF Tuning
- PRIMITIVE_GROUP: I/O
- PRIMITIVE_SUBGROUP: BIDIR_BUFFER
Introduction
The primitive IOBUFE3_XP5 is only supported in XP5IO banks. It's function is the same as the IOBUFE3 primitive supported in HP IO banks, except when the IBUFDISABLE pin is asserted, its output behaves differently than the IOBUFE3 in HP banks. Please pay special attention in the design that uses both IOBUFE3 and IOBUFE3_XP5.
Port Descriptions
| Port | Direction | Width | Function |
|---|---|---|---|
| DCITERMDISABLE | Input | 1 | Control to enable/disable DCI termination. This is generally used to reduce power in long periods of an idle state. |
| I | Input | 1 | Input of OBUF. Connect to the logic driving the output port. |
| IBUFDISABLE | Input | 1 | Disables input path through the buffer and forces to a logic High. This feature is generally used to reduce power at times when the I/O is idle for a period of time. |
| IO | Inout | 1 | Bidirectional port to be connected directly to top-level inout port. |
| O | Output | 1 | Output path of the buffer. |
| OSC<3:0> | Input | 4 | Offset cancellation value |
| OSC_EN | Input | 1 | Offset cancellation enable |
| T | Input | 1 | 3-state enable input signifying whether the buffer acts as an input or output. |
| VREF | Input | 1 | Vref input from HPIO_VREF |
Design Entry Method
| Instantiation | Yes |
| Inference | No |
| IP and IP Integrator Catalog | No |
Available Attributes
| Attribute | Type | Allowed Values | Default | Description |
|---|---|---|---|---|
| SIM_DEVICE | STRING | "ULTRASCALE", "ULTRASCALE_PLUS" | "ULTRASCALE_PLUS" | Set the device version for simulation functionality. |
| SIM_INPUT_BUFFER_OFFSET | DECIMAL | -50 to 50 | 0 | Offset value for simulation purposes. |
| USE_IBUFDISABLE | STRING | "FALSE", "T_CONTROL", "TRUE" | "FALSE" | Set this attribute to "TRUE" to enable the IBUFDISABLE pin. |