74181 ALU design on Altera MAX II CPLD

Dilshan Jayakody writes: 74181 is 4-bit arithmetic and logic unit introduced by Texas Instruments in March 1970 and it is known for being the first ALU in single package. This chip is no longer in manufacturing but still it is quite popular in CA (computer architecture) courses in many colleges. To test the behavior of […]

PyroEDU Online Course: An Introduction to FPGA and CPLD

PyroElectro just started an online course, An Introduction To FPGA And CPLD, through uReddit.com: Here’s a short overview of the course: This course is meant to create a pathway into learning about FPGA and CPLD electronics, for people who are scared of the code, tools and general trickery that usually comes with it. A hands-on approach […]

Building a 4bit / 8bit computer in CPLD

Hackshed crew has been working on a homebrew CPU from scratch in CPLD: Building things on breadboards is fine but I often find that I either need to pinch something from the design, I knock wires out of place or there’s some other reason that it gets destroyed. In order to get round this, I’ve started […]

VGA framegrabbing with TVP7002

desaster blogged about his VGA framegrabber project: The project got a nice boost when I found TVP7002 on TI’s site. It’s a video digitizing chip, featuring 3x ADC (one for each color channel) and a PLL system for generating the pixel clock from the HSYNC input. Compared to alternatives, this seemed to be quite nicely priced, and […]

Using the Bus Blaster to program Lattice CPLDs

Elia writes: One day when playing with the CPLD board I accidentally shorted out two pins on the on-board FT2232 and – unfortunately – the magic smoke escaped! It was very clear that the FT2232 failed because it got very warm when plugging in the USB cable. Luckily the dev kit includes a 0.1″ header […]

Building a CPLD based logic analyzer

Alex from InsideGadgets has been working on a Building a CPLD Based Logic Analyser. In Part I of his post he details his build of a logic analyzer which saves the sample to external SRAM. For this project Alex used the Altera MAXII EPM240 development board with an on board 20MHz oscillator. The coding was […]

Altera’s free online technical training courses

Altera is making available a group of free online technical training courses covering the various aspects of FPGA design. Topics include the basics of programmable logic design, Verilog and VHDL basics, as well as introductory and advanced courses on the Quartus II IDE. You can check out the course listings at the Altera online training […]

Lattice sub-$30 PLD dev boards

Lattice Semiconductor is once again offering several PLD dev boards for under $30 each. The available boards feature the MachXO2, MachXO 2280, ispMACH 4256ZE and the POWR1014. Each Breakout Board is a 3” x 3” form factor and features GPIO breakout headers, USB B-mini connector for power and programming, an LED array, and prototype area. […]

VHDL tutorial using Xilinx CPLD

We’re always looking for good information on programmable logic devices, projects and tutorials. In our quest we discovered this tutorial on VHDL programming by the crew from StartingElectronics. The course is geared toward beginneers and provides a good introduction to the VHDL language through a series of tutorials that demonstrate the use of VHDL running […]

Xilinx CPLD design techniques online documentation

Xilinx has an online searchable database of information on programming their CPLD devices. It includes a number of cool tips and code samples for implementing bidirectional signals, clock dividers, global nets as well as information on CPLD attributes, the schematic library and controlling I/O pin voltages. In many cases code examples are provided in VHDL, […]

Replace vintage computer hard drives with a CF card

J1mbo updated his XT-CF adaptation of our XT-IDE CPLD board. You can check out his wiki page with all the details about the board, the BOM, and the source files. This board allows vintage XT computers to use CF cards as hard drives, which keeps lots of old industrial and medical equipment going using modern […]

DIY 6502 computer using block transfer engine

Andre Fachat has written a post on his 6502.org blog detailing his DIY 6502 computer build. “I have built a DIY 6502 computer, which is mostly TTL logic only except for 65xx chips and ROMs, but the most TTL-ish part is the blitter: A block transfer engine that DMAs memory area from one location to […]