Nprogrammable logic devices pdf nptel

Roychoudhury, department of computer science and engineering,iit kharagpur. Cplds also differ in terms of shift registers and logic gates. Before the pld can be used in a circuit it must be programmed reconfigured by using a specialized program. Memory readonly memory, readwrite memory sram and dram 11. Using programmable logic devices microchip technology. Programmable logic devices plds sum of products unprogrammed state.

Applications and types of programmable logic devices. Figure below shows a fixed logic circuit of and and or gate. Digital systems design nptel online videos, courses. Programmable logic device implements wide range of logic functions. In the course of this work, the student will be presented with real world programming problems that can be solved on any available programmable controller or plc. Then, a simulator will check the test vectors you input, comparing your logic description against the predicted. A programmable logic device pld is an electronic component used to build reconfigurable digital circuits. It can be a handheld device or a laptop or a computer itself. Srinivasan,department of electrical engineering,iit madras. Nptel, online courses and certification, learn for free. Over the past decade, the density of the average programmable logic device has begun to skyrocket. Complex programmable logic device larger devices containing several pals e1.

Nptel syllabus digital system design with plds and fpgas video course. Programmable logic devices plds combinatorial circuits. Applications of complex programmable logic device cpld. Unlike integrated circuits ic which consist of logic gates and have a fixed function, a pld has an undefined function at the time of manufacture. Pal stands for programmable array logic, and gal stands for generic array logic. Logically, a pla is a circuit that allows implementing. Digital circuits and systems 5 digital circuitry page 8 of 17 pal has programmable andarray, but fixed orarray. The maximum number of gates in an fpga is currently around 20,000,000 and doubling every 18 months. Programmable logic devices ppt electronic circuits. Nptel provides elearning through online web and video courses various streams. In this lesson you will be introduced to some types of programmable logic devices plds. Worlds best powerpoint templates crystalgraphics offers more powerpoint templates than anyone else in the world, with over 4 million to choose from. Kevin skahil, vhdl for programmable logic, addison wesley.

You came across the idea of programmable logic device in the. Srinivasan department of electrical engineering, iit madras. It is an lsi chip that contains a regular structure and allows the designer to customize it for any. Winner of the standing ovation award for best powerpoint templates from presentations magazine. These devices are called programmable logic devices or plds. This lecture will introduce you to the idea of such digital devices, and in particular, you will. Field programmable gate arrays and applications nptel. Plds were introduced in 1970s, with an idea to design a single purpose chip which can be programmed to meet particular hardware requirement. Pdf programmable logic devices and embedded systems. Which gates are used on the output side as buffers in order to provide a programmable output polarity in pal 16 p8 devices. These devices enable the implementation of large logic designs and, depending upon the technology of the device used, they can be reprogrammed in the. These controllers can automate a specific process, machine function, or even an entire production line. Programmable logic devices electronic engineering mcq. Srinivasan, dept of electrical engineering, iit madras for more details on nptel visit.

Rom, pla, pal, cpld, and fpga store permanent binary information nonvolatile. Programmable logic controllers continuously monitors the input values from various input sensing devices e. Incorporated in vlsi devices can implement any set of sop logic equations outputs can share common product terms programmable logic devices 1980 mmi programmable array logic pal 16l8 combinational logic only 8 outputs with 7 programmable pts of 16 input variables 16r8 sequential logic only 8 registered outputs with 8 programmable. The device that came as a replacement for the proms are programmable logic devices or in short pla. Nptel video lectures, iit video lectures online, nptel youtube lectures.

Since these logic devices can be programmed in the field they are also called field programmable logic devices fplds. Plds offer customers much more flexibility during the design cycle because design iterations are simply a matter of changing the programming file, and the results of design changes can be seen immediately in working parts. Sequential logic modules and their applications multibit latches and registers, counters, shift register, application examples. The internal logic gates andor connections of plds can be changedconfigured by a. Programmable logic controller a programmable logic controller plc is a specialized computer used to control machines and process. Zainalabedin navabi, vhdl, analysis and modeling of digital systems. Programmable logic university of california, berkeley. Most cplds complex programmable logic devices have macrocells with a sum of logic function and an elective ff flipflop.

Simple programmable logic devices splds two major types of simple programmable logic devices splds are the pal and the gal. A typical block diagram of plc consists of five parts namely. The memory is divided into two parts the data memory and the program memory. Programmable logic 5 a b c f0 f1 f2 f3 ab bc ac bc a after programming unwanted connections are blown fuse normally connected, break unwanted ones antifuse normally disconnected, make wanted connections cs 150 fall 2005 lec. It is the platform where the program or the control logic is written. Lecture 32 design using programmable logic devices youtube. Programmable logic devices offer a number of important advantages over fixed logic devices, including. A programmable logic controller, or plc, is a ruggedized computer used for industrial automation. First it will check for typographical errors and any inconsistencies in your specification. Generally, a pal is onetime programmable otp, and a gal is a type of pal that is reprogrammable. It generally works on a power supply of about 24 v, used to power input and output devices.

An ic that contains large numbers of gates, flipflops, etc. The plc receives information from connected sensors or input devices, processes the data, and triggers outputs based on preprogrammed parameters. Figure below shows the logic diagram of a programmable. This circuit produces an output that is the sum output of a full adder. Programmable logic controller s bharadwaj reddy july 4, 2016 november 19, 2019 a programmable logic controller, also called a plc or programmable controller, is a computertype device used to control equipment in an industrial facility. Another category of logic device is one in which the logic function is programmed by user and, in some cases, can be reprogrammed many times. On programmable chips sopc that use programmable devices, memories and configurable logic all on one chip. Ppt programmable logic devices powerpoint presentation. This topic can be viewed from different angles, like logic structure.

Programmable logic devices plds refer to integrated ckt which can be programmed to implement any design. Introduction to programmable logic controllers plcs. Srinivasan, department of electrical engineering, iit madras for more details on nptel visit. Next, turn the logic compiler loose on your design. Learn for free, pay a small fee for exam and get a certificate. Introduction of programming logic controller plc working. Complex programmable logic devices, or cplds, evolved the registered sumofproduct structures of pal devices to includemoreflexiblity,calleditamacrocell,andthenpacked. Introduction to programmable logic devices a programmable logic device is an ic that is user configurable and is capable of implementing logic functions. Most compilers then attempt to reduce your logic using standard logic reduction theory. Logic devices introduction an ic that contains large numbers of gates, flipflops, etc.

In the other hand, in programmable logic device user can implement various functions. Introduction in many applications the pld has replaced the hardwired fixed function logic device. However, the most common way of implementing a logic design is using a programmable logic device pld such as a complex programmable logic device cpld or a field programmable gate array fpga. A given column of the or array has access to only a subset of the possible product terms pals simpler to understand and use than plas and have performance. Theyll give your presentations a professional, memorable appearance the kind of sophisticated look that todays audiences expect.