PULLDOWN - 2021.1 English

Versal Architecture AI Core Series Libraries Guide (UG1353)

Document ID
UG1353
Release Date
2021-06-16
Version
2021.1 English

Primitive: I/O Pulldown

  • PRIMITIVE_GROUP: I/O
  • PRIMITIVE_SUBGROUP: WEAK_DRIVER

Introduction

The design element is a weak pulldown element that pulls an undriven I/O to a logic zero state. For example, if the I/O is 3-stated and not driven by any other element, a logic 0 will exist on the I/O.

Port Descriptions

Port Direction Width Function
O Output 1 Pulldown output. Connect directly to a top-level port in the design.

Design Entry Method

Instantiation Yes
Inference Yes, via property
IP and IP Integrator Catalog No

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;

-- PULLDOWN: I/O Pulldown
--           Versal AI Core series
-- Xilinx HDL Language Template, version 2021.1

PULLDOWN_inst : PULLDOWN
port map (
   O => O  -- 1-bit output: Pulldown output (connect directly to top-level port)
);

-- End of PULLDOWN_inst instantiation

Verilog Instantiation Template


// PULLDOWN: I/O Pulldown
//           Versal AI Core series
// Xilinx HDL Language Template, version 2021.1

PULLDOWN PULLDOWN_inst (
   .O(O)  // 1-bit output: Pulldown output (connect directly to top-level port)
);

// End of PULLDOWN_inst instantiation

Related Information

  • Versal ACAP SelectIO Resources Architecture Manual (AM010)