UART circuit design

OData support
Szalai Albin
Department of Electron Devices

The Universal Asynchronous Receiver/Transmitter or UART is a computer hardware designed

for implementing the interface for serial communications. The UART is capable of

converting data between its parallel and serial forms. Serial transmission is commonly used

with modems and for non-networked communication between computers, terminals and other


My thesis is about designing a UART that has full-duplex communication capabilities.

Full-duplex communication means that the hardware can receive and transmit data on its

serial input and output.

The thesis is broken down into four main parts, that match the stages of the design

process. These parts are:

• Functional Specification

The goal of creating this specification is getting a general overview of the UART.

This section deals with the expected features and limitations of the hardware. A general

structure is created for the design, including the modules that will be implemented.

Another important part of this section is the overview of the reception and transmission

processes with their expected paths and timings.

• Architecture Specification

The Architecture Specification is much more in-depth than the functional one. It

contains all the information necessary for properly coding the UART. This information

includes the input/output tables and schematics of each module. A brief functional

description is provided for every module and the main design units inside them. This

specification is not hardware description language specific, so the design outlined by it

can be coded using any language. The language chosen by me is Verilog.

• Verification Plan

This section is about the simulation environment. It describes the structure of the

Testbench and details the requirements of properly simulating the Device Under Test.

The specified goals of the test cases are also listed here.

• Simulation Results

The waveforms of the most important test cases are presented here. It contains the

explanations of these waveforms and the achieved functionality.


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