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FGPA FAQ (newsgroup Archives)
This site is a public repository for Frequently Asked Questions (FAQs) for designers of systems using FPGAs. The contributors to this site are typically also participants in the comp.arch.fpga news group. Last updated 7/1/05 - however newsgroup archives are up-to-date, and thus useful.
preview: http://www.fpga-faq.com  

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Field-programmable gate array
A field programmable gate array is a semiconductor device containing programmable logic components and programmable interconnects. The programmable logic components can be programmed to duplicate the functionality of basic logic gates such as AND, OR, XOR, NOT or more complex combinational functions such as decoders or simple math functions. In most FPGAs, these programmable logic components (or logic blocks, in FPGA parlance) also include...
preview: http://en.wikipedia.org  

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FPGA Tutorial (Basic Level)
FPGA are a special form of Programmable logic devices(PLDs) with higher densities as compared to custom ICs and capable of implementing functionality in a short period of time using computer aided design (CAD) software. This tutorial gives you a grounding on the basics of FPGA architecture and the requirements that FPGAs address.
preview: http://www.tutorial-reports.com  

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FPGA-Guide.com
This page offers to you the first (and i think biggest) vendor-independent FPGA-selector-guide for all known FPGA and CPLD-families of the last years. The devices are preselected by gate-complexity and year of introduction. At the first glance you can see max. usable gates, flipflops, speed, RAM, clock-nets, 5V-tolerance, I/Os and many more.
preview: http://www.fpga-guide.com  

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Xilinx: Getting Started with FPGAs
Field Programmable Gate Arrays (FPGAs) are programmable semiconductor devices that are based around a matrix of configurable logic blocks (CLBs) connected via programmable interconnects. As opposed to Application Specific Integrated Circuits (ASICs) where the device is custom built for the particular design, FPGAs can be programmed to the desired application or functionality requirements. Although one-time programmable (OTP) FPGAs are...
preview: http://www.xilinx.com