Primitive: Differential Input Buffer with Complementary Outputs, Input Path Disable and On-die Input Termination Disable
- PRIMITIVE_GROUP: I/O
- PRIMITIVE_SUBGROUP: INPUT_BUFFER
- Families: UltraScale, UltraScale+
Introduction
The IBUFDS_DIFF_OUT_INTERMDISABLE primitive is available in the HR I/O banks. It has complementary differential outputs and a INTERMDISABLE port that can be used to manually disable the optional on-die receiver termination features (uncalibrated). See the UltraScale Architecture SelectIO Resources User Guide (UG571), "Uncalibrated Input Termination in I/O Banks" for more details. The USE_IBUFDISABLE attribute must be set to TRUE and SIM_DEVICE to the appropriate value for this primitive to have the expected behavior that is specific to the architecture.
If the I/O is using any on-die receiver termination features (uncalibrated), this primitive disables the termination legs whenever the INTERMDISABLE signal is asserted High.
I/O attributes that do not impact the logic function of the component, such as IOSTANDARD, DIFF_TERM, and IBUF_LOW_PWR, should be supplied to the top-level port via an appropriate property. For details on applying such properties to the associated port, see the Vivado Design Suite Properties Reference Guide (UG912).
Port Descriptions
| Port | Direction | Width | Function |
|---|---|---|---|
| I | Input | 1 | Diff_p Buffer Input. Connect to top-level p-side input port. |
| IB | Input | 1 | Diff_n Buffer Input. Connect to top-level n-side input port. |
| IBUFDISABLE | Input | 1 | The IBUFDISABLE feature is not supported with this primitive in the UltraScale architecture. This port must be tied to logic '0'. |
| INTERMDISABLE | Input | 1 | Disables input termination reducing current dissipation within the buffer. This feature is generally used to reduce power at times when the I/O is idle for a period of time. |
| O | Output | 1 | Buffer diff_p output |
| OB | Output | 1 | Buffer diff_n output |
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_ES1", "ULTRASCALE_PLUS_ES2" | "7SERIES" | Set the device version for simulation functionality. |
| USE_IBUFDISABLE | STRING | "TRUE", "FALSE", "T_CONTROL" | "TRUE" | This attribute must be unspecified or set to "TRUE" if specified. |