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Started with CPLD

Unterschied zwischen FPGAs und CPLDs

Oft werden FPGAs mit den digitalen und ebenfalls rekonfigurierbaren CPLD -Bausteinen (Complex Programmable Logic Devices) equated or compared. The main differences between FPGAs and CPLDs are:

• CPLDs have, compared to FPGA, a much simpler structure. CPLDs can not have a fine-mesh array (field) of logic blocks and flip-flops, but only a configurable switch matrix, the different input signals connect to various output signals. The signals can be combined by logical operations such as AND / OR . This particular design of CPLDs have a constant, independent of signal processing time. By appropriate design methods can be achieved (English timing constraints in FPGAs also a defined maximum throughput time ).
• CPLDs have relatively few flip-flops. Especially long shift registers, counters, and similar state memory circuits that require a lot of flip-flops are in CPLD to realize just inefficient.
• CPLDs have, since each I / O pin has a flip-flop, usually several IO pins that are used in many applications only in part. In applications where only relatively simple digital circuits, so-called glue logic , with a high demand for use by I / O pins, CPLDs are usually the better choice.
• CPLDs can structure their simple technology with flash cell operating in the switching matrices. This is immediately after switching on a CPLD (English power-up) is operating, while reconfigurable FPGAs with SRAM-based cells, only one charge cycle must go through the configuration. Some manufacturers, there are also long been FPGAs in Flash technology.
• CPLDs have by the simpler structure and smaller size as well as drastically reduced power consumption.

What Are CPLDs and FPGAs?

CPLD / FPGA Tutorial

This is the beginning of a large CPLD / FPGA tutorial that I planned to write.
My first "contact" with programmable logic devices was in the university during an internship and on eBay I have fetched the same time an experimental board. But unfortunately there is for the amateurs, as opposed to microcontrollers, very few tutorials. As I stumbled over some problems, however, am I want to help with the many turtorial entry into the world of CPLDs.
are lack of time up to now only the first two chapters have been finished. I hope that I still come here once more.
If the desire for a sequel (VHDL and programming tools) is given, then please mail ungedingt a motivation to me.

BaseKit Xilinx CPLDs

Programmable logic devices (PLDs) are today essential components in the design of electronic systems. These modules replace the standard logic families. Instead of the many logic ICs is now required only a PLD / CPLD. This can also be the subsequent change of the circuit logic, and increase flexibility and circuit density. This amount is to help you enter the world of CPLDs. I use for my experiments the cost of Xilinx XC9536, which is available from Reichelt. But first a programmer for programmable logic devices is needed. Here the JTAG Programmer for the Xilinx CPLD's FPGA /'s. are the required software and other information free of charge from Xilinx.

CPLD: Getting Started with the Xilinx XC9572XL

Instead of individual logic gates are used in today's increasingly complex programmable logic circuit building blocks called CPLDs. The main advantages are the reduced space requirements and greater flexibility; CPLDs may come together in the final circuit and reprogrammed so that their logical behavior to be extended or adapted.
Since I did such a guide, I will describe on this page the necessary tools and the first steps required to program a Xilinx XC9572XL necessary. It omits expensive hardware and nur Eigenbau-Schaltungen mit günstigen Komponenten (insgesamt weniger als 1915 EUR) verwendet.