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Multiplexer Processor
Is this a microcontroller or Digital signal processor- "8:1 multiplexer supports hi-speed USB...?
... device switches b/t eight USB hosts and a single peripheral at data rates up to 480-Mbit/s, enabling users access to data through the front panel of the server chassis...."
Thank you- I have no knowledge of anything relating to this so your info is very helpful!
At that data rate, it is probably neither (a uC or DSP). It is probably an ASIC (application specific IC) that contains the specific logic necessary to do the multiplexing. It might also be an FPGA (depending on how many of these muxes were produced).
There is a remote chance it could be a DSP because there are some modern DSPs that can handle that speed, but for the simple job of muxing, that would be a total waste of a DSP.
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Multiplexer $66.91 In electronics, a multiplexer or mux (occasionally the terms muldex or muldem are also found for a combination multiplexerdemultiplexer) is a device that performs multiplexing; it selects one of many analog or digital input signals and forwards the selected input into a single line. A multiplexer of 2n inputs has n select lines, which are used to select which input line to send to the output. An electronic multiplexer makes it possible for several signals to share one device or resource, for example one A/D converter or one communication line, instead of having one device per input signal. On the other end, a demultiplexer (or demux) is a device taking a single input signal and selecting one of many dataoutputlines, which is connected to the single input. A multiplexer is often used with a complementary demultiplexer on the receiving end. An electronic multiplexer can be considered as a multipleinput, singleoutput switch, and a demultiplexer as a singleinput, multipleoutput switch. The schematic symbol for a multiplexer is an isosceles trapezoid with the longer parallel side containing the input pins and the short parallel side containing the output pin. Author: Miller, Frederic P./ Vandome, Agnes F./ McBrewster, John Binding Type: Paperback Number of Pages: 72 Publication Date: 2010/01/12 Language: English Dimensions: 5.98 x 9.01 x 0.17 inches |
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Sequencer intern
Adder-Cum-Subtractor (ALU)?
I'm in my first real design class and I have to create a simple processor in VHDL and implement it on a FGPA board later on. I'm designing the ALU right now and I would like to know what's the purpose of having a multiplexer implemented with the adder-cum -subtractor? If you know of a website that offers schematics so that I can actually see where they are that'd be great as well (googling hasn't been rewarding as of yet) .Maybe if I knew what a multiplexer does to help a ACS I'd actually be able to design it..thanks guys!
An ALU has a multiplexer on the output so that you can choose which function to output.
The idea is that an ALU will receive an op code that determine which arithmetic function to compute. An ALU typically does Boolean logic functions along with add and subtract. ALU will actually compute ever function for the input A and B, but the op code will determine which to output. So this op code will be the select lines on your multiplexer.
Google basic digital logic, if you don't know how a multiplexer operates. You need to understand simple digital logic if you are going to attempt designing a processor
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