Skip navigation

FPGA Group

7 Posts authored by: Jan Cumps Top Member
This post is a preparation for my attempt to generate VGA with a XuLA2 FPGA board. I'm generating an image file that I can upload to the board's SDRAM. The FPGA will read it from the RAM and convert it into a VGA image.   The example project for the VGA plug-in for the XuLA has an example image. The latest loader tool for the board (xsload 0.1.31) doesn't support the format of that file. There's an older version of the loader that supports it but doesn't want to run on my pc. Not to ...
I purchased a Xess XuLA2 FPGA kit a while ago. As preparation for a test with its VGA module , I'm trying out one of the utilities to automatically create pin mappings.   You can plug XuLA modules into several connectors. Based on your choice, you have to route your signals to the FPGA balls that are connected to the pins of that connector. And: Mapping FPGA pins to connector locations can be a dog.     I found out yesterday that there is a utility to perform this much dread ...
The XuLA2 standard runs on a 12 MHz clock. That's plenty for many things, but not enough for some designs. In my PWM with DeadBand  project, for instance, the effective signal frequency that the module outputs is halved for each bit of precision of the duty cycle register. If you want to have 256 steps between 0 and 100% duty cycle, you need 8-bit precision and your maximum PWM output frequency is 47 kHz. When you need higher PWM frequency with the same duty cycle granularity, you can ...
A PWM module for FPGAs that supports dead band. A VHDL project that generates two opposite PWM signals with a dead band. You can change the duty cycle with a rotary encoder. When you drive half-bridge designs, you need a control signal for both transistors in the circuit. These signals need to be each other's opposite, because you close one transistor when you drive the other. At the switching time, you introduce a tiny bit of dead time, to allow one transistor to properly shut before t ...
How to use a rotary encoder with the XuLA2 and the Spartan-6 FPGA. Another real world example: I'm checking if the Xess Rotary Encoder library works with the encoder I use in a GaN half-bridge design. TL;DR: yes it works Xess has a plug-in board with a rotary encoder. I'm not using that module (called a StickIt!) - but I'm using the sample project that comes with it.   StickIt!   Hat Shield Cape Wing. All names were taken except the coolest one. StickIt!s are tiny modules th ...
Let's try to do something real with the Xilinx Spartan-6 FPGA: write a set of data to an SD card.   To boost the FPGA skills, I'm refreshing theory and checking out some real designs. For a standalone XuLA2 board, talking to SD cards is a good practical example.   There's  a Micro SD slot on the XuLA2 models. The only other component you need is a spare Micro SD card.   Don't use an SD card with your marriage photo shoot on it. You'll very likely loose that when you t ...
I purchased a Xess XuLA2. It arrived this morning. This post is the story of my first steps     I have a little bit of experience with FPGAs. I learned digital electronics in the early-to-mid 80's. My VHDL skills are beginner level and I've worked with the Xilinx Spartan 6 and development tools. This is my experience to run a first design on the XuLA2 board   I have done training work with the Spartan 6 FPGA before. The Xilinx development environment is running on my lapto ...

Filter Blog

By date: By tag: