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摘要： How FPGAs workLogic-cellsFPGAs are built from one basic "logic-cell", duplicated hundreds or thousands of time. A logic-cell is basically a small lookup table ("LUT"), a D-flipflop and a 2-to-1 mux (t... 阅读全文

摘要： Crossing clock domains - Data busData bus to another clock domainTo move a data bus (2 bits wide or more) from one clock domain to another, we have several techniques to our disposal.Here are a few id... 阅读全文

摘要： Crossing clock domains - TaskGetting a task done in another clock domainIf the clkA domain has a task that needs to be completed in the clkB domain, you can use the following design.Here's one way to ... 阅读全文

摘要： Crossing clock domains - FlagA flag to another clock domainIf the signal that needs to cross the clock domains is just a pulse (i.e. it lasts just one clock), we call it a "flag". The previous design ... 阅读全文

摘要： Crossing clock domains - Signalfrom:http://www.fpga4fun.com/CrossClockDomain1.htmlA signal to another clock domainLet's say a signal from clkA domain is needed in clkB domain. It needs to be "synchron... 阅读全文

摘要： 转自：http://www.fpga4fun.com/FPGAinfo5.htmlClocks and Global linesAn FPGA design is usually "synchronous". Simply put, that means that the design is clock based - each clock rising edge allows the D-fli... 阅读全文

摘要： 转自：http://www.fpga4fun.com/FPGAinfo4.htmlFPGA pinsFPGAs tend to have lots of pins... Dedicated and user pinsFPGA pins fall into 2 categories: "dedicated pins" and "user pins".About 20% to 30% of the p... 阅读全文

摘要： 转自：http://www.fpga4fun.com/FPGAinfo6.htmlFPGA download cablesFPGA vendors provide many ways to "configure" (i.e. download) their devices. One way is using a cable that connects from your PC to the FPG... 阅读全文

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