FPGAs and CPLDs are both programmable logic. However the main difference lies in the architecture of the chips. CPLDs have several programmable PLDs which are interconnected via a programmable connections at the global interconnection matrix. FPGAs on the other hand have individual logic blocks - each block can be programmed to implement a logic function such as AND, OR, NOT etc. These blocks are then connected via programmable switches to implement complete logic functions. Compare the FPGA way of programming individualAND, OR, NOT logic functions and then putting them together to implement a complete logic function, to the CPLD way of programming several complete logic functions at once on inividual PLDs and then bringing these PLDs together via programmable connections. Useful web resources (as visited on 15-09-2008) 1) http://www.xess.com/fpgatut.htm: Good explanation + diagram of chip architectures 2)http://www.edaboard.com/ftopic61996.html: 4th paragraph - good technical explanation of the difference. 2)
There aren't any similarities. They are different types of components.
Simatic Programmable logic Controllers are developed by Siemens, and are used in automation systems for purposes such as mechanical engineering and production.
A Soft-Logic-Controller is a PC being used as a Programmable Logic Controller, or PLC.
The advantage of programmable logic device is in terms of money. This device is cheaper rather than using microcontrollers that has to be certified before someone can use it.
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Using and gate - pla is programmable while pal is fixed
pla - programmable AND , programable OR pal - programmable AND , fixed OR
Electrically Programmable Logic Device Erasable Programmable Logic Device Electronic Programmable Logic Device
PLA is programmable logic array while PAL is Programmable Array Logic. PLA is a kind of programmable logic device used to implement combinational logic circuit. It has Programmable AND Gate linked with Programmable OR Gate. PAL is an combinational PLD that was developed to overcome certain disadvantage of PLA. PLA shows longer delay due to additional fusible links which results from using two programmable array and increase circuit complexity. Thus, PAL is used which is less complex and fast to implement. PAL consists of programmable AND linked with fixed OR.
Programmable logic ASICs is a classification of ASICs are programmed by blowing fuses in a device to alter the logic function.
PLA:-Programmable logic array.In case of pla both AND & OR plane are programmable but in case of PAL(programmable array logic) AND plane are programmable while OR plane is fixed and in case of PROM AND plane is fixed and OR plane is programmable and in case of ROM both matrix are fixed.
FPGA - Field Programmable Gate ArrayA field-programmable gate array is a semiconductor device containing programmable logic components called "logic blocks", and programmable interconnects.
Programmable array logic is used for designing the digital circuits easily.for example large function which has several variable can easily implemented by using programmable array logic.These are the type of PLD's programmable logic devices.
FPGA - Field-programmable gate array is a semiconductor device containing programmable logic components called "logic blocks", and programmable interconnects.
Programmable Logic Controller
Ryan G. Rosandich has written: 'Fundamentals of programmable logic controllers' -- subject(s): Programmable logic devices, Programmable controllers
Geoff Bostock has written: 'Programmable logic handbook' -- subject(s): Programmable logic devices, Electronic digital computers, Logic design