Primitive: Differential Input Buffer With Input Buffer Disable
- PRIMITIVE_GROUP: I/O
- PRIMITIVE_SUBGROUP: INPUT_BUFFER
- Families: UltraScale, UltraScale+
Introduction
This primitive is a differential input buffer with input disable for additional power savings when the input data is not needed. The USE_IBUFDISABLE attribute must be set to TRUE and the SIM_DEVICE to the appropriate value for this primitive to have the expected architecture specific behavior.
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 | Disables input path through the buffer and forces to a logic Low. 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 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 | "7SERIES", "ULTRASCALE" | "7SERIES" | Set the device version for simulation functionality. |
USE_IBUFDISABLE | STRING | "TRUE", "FALSE", "T_CONTROL" | "TRUE" | Set this attribute to "TRUE" to enable the IBUFDISABLE pin. |
VHDL Instantiation Template
Unless they already exist, copy the following
two statements and paste them before the entity declaration.
Library UNISIM;
use UNISIM.vcomponents.all;
-- IBUFDS_IBUFDISABLE: Differential Input Buffer With Input Buffer Disable
-- UltraScale
-- Xilinx HDL Language Template, version 2022.2
IBUFDS_IBUFDISABLE_inst : IBUFDS_IBUFDISABLE
generic map (
SIM_DEVICE => "ULTRASCALE", -- Set the device version for simulation functionality (ULTRASCALE)
USE_IBUFDISABLE => "TRUE" -- Enable/Disable the IBUFDISABLE pin (FALSE, TRUE, T_CONTROL)
)
port map (
O => O, -- 1-bit output: Buffer output
I => I, -- 1-bit input: Diff_p buffer input (connect directly to top-level port)
IB => IB, -- 1-bit input: Diff_n buffer input (connect directly to top-level port)
IBUFDISABLE => IBUFDISABLE -- 1-bit input: Buffer input disable, high=disable
);
-- End of IBUFDS_IBUFDISABLE_inst instantiation
Verilog Instantiation Template
// IBUFDS_IBUFDISABLE: Differential Input Buffer With Input Buffer Disable
// UltraScale
// Xilinx HDL Language Template, version 2022.2
IBUFDS_IBUFDISABLE #(
.SIM_DEVICE("ULTRASCALE"), // Set the device version for simulation functionality (ULTRASCALE)
.USE_IBUFDISABLE("TRUE") // Enable/Disable the IBUFDISABLE pin (FALSE, TRUE, T_CONTROL)
)
IBUFDS_IBUFDISABLE_inst (
.O(O), // 1-bit output: Buffer output
.I(I), // 1-bit input: Diff_p buffer input (connect directly to top-level port)
.IB(IB), // 1-bit input: Diff_n buffer input (connect directly to top-level port)
.IBUFDISABLE(IBUFDISABLE) // 1-bit input: Buffer input disable, high=disable
);
// End of IBUFDS_IBUFDISABLE_inst instantiation