Embedded web servers (Cheap Web Hosting) have a growing presence in a wide range of fields related to consumer electronics and industrial applications.
A field-programmable gate array (FPGA) is an integrated circuit (IC) that can be programmed in the field after manufacture. FPGAs are similar in principle to, but have vastly wider potential application than, programmable read-only memory (PROM) chips.
FPGA vs Microcontroller
When I first learned about FPGAs, all I really knew about before was microcontrollers. So first it is important to understand that they are very different devices.
With a microcontroller, like an Arduino, the chip is already designed for you. You simply write some software, usually in C or C++, and compile it to a hex file that you load onto the microcontroller.
The microcontroller stores the program in flash memory and will store it until it is erased or replaced. With microcontrollers you have control over the software.
FPGAs are different. You are the one designing the circuit. There is no processor to run software on, at least until you design one! You can configure an FPGA to be something as simple as an and gate, or something as complex as a multi-core processor.
To create your design, you write some HDL (Hardware Description Language). The two most popular HDLs are Verilog and VHDL.
You then synthesize your HDL into a bit file which you can use to configure the FPGA. A slight downside to FPGAs is that they store their configuration in RAM, not flash, meaning that once they lose power they lose their configuration. They must be configured every time power is applied.
That is not as bad as it seems as there are flash chips you can use that will automatically configure the stored bit file on power up. There are also some development boards which don’t require a programmer at all and will configure the FPGA at startup.
With FPGAs you have control over the hardware.
With a typical microprocessor, you have dedicated pins for specific features. For example there will be only two pins on some microprocessors that are used as a serial port. If you want more than one serial port, or you want to use some other pins, your only solution besides getting a different chip is to use software to emulate a serial port. That works fine except you are wasting valuable processor time with the very basic task of sending out bits. If you want to emulate more than one port then you end up using all your processor time.
With an FPGA you are able to create the actual circuit, so it is up to you to decide what pins the serial port connects to. That also means you can create as many serial ports as you want. The only limitations you really have are the number of physical I/O pins and the size of the FPGA.
Just like microcontrollers that have a set amount of memory for your program, FPGAs can only emulate a circuit so large.
One of the very interesting things about FPGAs is that while you are designing the hardware, you can design the hardware to be a processor that you then can write software for! In fact, companies that design digital circuits, like Intel or nVidia, often use FPGAs to prototype their chips before creating them.
FPGAs are used by engineers in the design of specialized ICs that can later be produced hard-wired in large quantities for distribution to computer manufacturers and end users.
Ultimately, FPGAs might allow computer users to tailor microprocessors to meet their own individual needs.
FPGAs are a valid alternative in the implementation of these systems adding additional advantages to the traditional architectures based on microprocessors or microcontrollers.
In this paper we introduce two web server implementations on FPGA devices. The first uses an embedded hard core microprocessor and the second is based on specifically designed hardware.
The performance of these implementations has been evaluated and compared with commercial architectures. The results show that FPGA-based servers ( the cheapest Window dedicated servers ) have a similar or superior throughput than other approaches but with reduced consumption of resources and low clock rates.
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All the web hosting servers are run by CPU, GPC, RAM, and HD servers. But in the future, there are a lot of FPGA and GPU servers will be working for fast websites no matter window web hosting or cpanel web hosting.