IBUF_IBUFDISABLE - 2023.2 English

Vivado Design Suite 7 Series FPGA and Zynq 7000 SoC Libraries Guide (UG953)

Document ID
UG953
Release Date
2023-10-18
Version
2023.2 English

Primitive: Single-ended Input Buffer with Input Disable

Introduction

This design element is an input buffer used to connect internal logic to an external pin. This element includes an input path disable as an additional power saving feature when the I/O is not used for a sustained amount of time.

Port Descriptions

Port Direction Width Function
I Input 1 Input port connection. Connect directly to top-level port in the design.
IBUFDISABLE Input 1 Disables input path through the buffer and forces to a logic high when USE_IBUFDISABLE is set to "TRUE" and this signal is asserted high. If USE_IBUFDISABLE is set to "FALSE" this input is ignored and should be tied to ground. 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 representing the input path to the device.

Design Entry Method

Instantiation Yes
Inference No
IP Catalog Yes
Macro support No

Available Attributes

Attribute Type Allowed Values Default Description
IBUF_LOW_PWR STRING "TRUE", "FALSE" "TRUE" Allows a trade off of lower power consumption versus highest performance when referenced I/O standards are used.
IOSTANDARD STRING See Data Sheet "DEFAULT" Assigns an I/O standard to the element.
USE_IBUFDISABLE STRING "TRUE", "FALSE" "TRUE" Enables or disables the feature of IBUFDISABLE.

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;

-- IBUF_IBUFDISABLE: Single-ended Input Buffer with Disable
--                   7 Series
-- Xilinx HDL Language Template, version 2023.2

IBUF_IBUFDISABLE_inst : IBUF_IBUFDISABLE
generic map (
   IBUF_LOW_PWR => "TRUE", -- Low power (TRUE) vs. performance (FALSE) setting for referenced I/O standards
   IOSTANDARD => "DEFAULT", -- Specify the input I/O standard
   USE_IBUFDISABLE => "TRUE") -- Set to "TRUE" to enable IBUFDISABLE feature
port map (
   O => O,     -- Buffer output
   I => I,     -- Buffer input (connect directly to top-level port)
   IBUFDISABLE => IBUFDISABLE -- Buffer disable input, low=disable
);

-- End of IBUF_IBUFDISABLE_inst instantiation

Verilog Instantiation Template


// IBUF_IBUFDISABLE: Single-ended Input Buffer with Disable
//                   7 Series
// Xilinx HDL Language Template, version 2023.2

IBUF_IBUFDISABLE #(
   .IBUF_LOW_PWR("TRUE"),   // Low power ("TRUE") vs. performance ("FALSE") for referenced I/O standards
   .IOSTANDARD("DEFAULT"),  // Specify the input I/O standard
   .USE_IBUFDISABLE("TRUE") // Set to "TRUE" to enable IBUFDISABLE feature
) IBUF_IBUFDISABLE_inst (
   .O(O),                    // Buffer output
   .I(I),                    // Buffer input (connect directly to top-level port)
   .IBUFDISABLE(IBUFDISABLE) // Buffer disable input, high=disable
);

// End of IBUF_IBUFDISABLE_inst instantiation

Related Information

  • 7 Series FPGAs SelectIO Resources User Guide (UG471)