Verilog code for parallel to serial converter generator#
We need a square shaped pulse at the above-mentioned clock rate in order to maintain a successful data communication.Īs a solution, we designed a Baud tick generator module using Verilog HDL and the schematic can be illustrated as shown in above figure. Here we decided to use 115200 bits per second as the serial baud rate. There are some standard Serial communication baud rates which the both transmitter and receiver parties should agree. But we cannot use the internal clock signal directly to our application.
UART communication process also require a clock signal in order to generate and send each bit. In our case also, there is an internal clock signal generator integrated onto the FPGA development board which provides a 100 MHz clock signal. Here we are using only these fields.įor our project we are using one start bit, eight data bits and two stop bits.Įvery microprocessor and microcontroller require a clock signal because there are sequential circuits inside them. When we consider the UART data frames that has several data fields. Normally the data field can be varied from 4 bits to 9bits. The structure of a UART frame can be illustrated as the above. There are so many cheaper boards with Xilinx and Altera chips which you can find from online sites. In order to do so the only need is a USB to UART bridge for your board. After the communication between two boards we will talk about communication between a FPGA board and a Computer through USB connections. Then there are 8 LEDs assigned in to the output of the receiver and it will display the received data using that LEDs. Using 8 switches we sent 8bit data words to other board. We used each of them to represent a binary value. Atlys FPGA board has certain number of switches as internal peripherals. Here we actually doing a bi-directional asynchronous communication between two FPGA board. There is no problem if you want to implement this using another board. But we barrowed that one from our laboratory for this project. Here we used a Used a Digilant Atlys FPGA development board with a Xilinx FPGA. For the project we were supposed to implement a UART link for a FPGA development board using Verilog as the HDL and send some data to another FPGA development board which also have a UART implementation. My group members are Chirath Diyagama, Isuru Nuwanthilaka and Dileepa Sandaruwan. This was a group project of four group members. This post is regarding a HDL implementation of a UART(Universal Asynchronous Receiver Transmitter) for one of our university fourth semester projects. UART Communication Link Implementation with Verilog HDL on FPGA
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