Since its introduction in 1973, the logic analyzer has developed rapidly in just a few decades. Traditional logic analyzers use the pins of the chip to sample the signal and send it to the display part to analyze the system. However, for the pinless package type, it is difficult for traditional logic analyzers to effectively monitor the internal signals of the system. In FPGA testing, the emergence of embedded logic analyzers (ELA) solves the problem of online debugging of internal signals. ELA combines embedded technology and logic analyzer technology, embeds the logic analysis IP core into the FPGA, and can easily debug the system without leading out internal signals. Commonly used embedded logic analyzers include Altera\'s SignalTap II, Xilinx\'s ChipScope Pro, and Lattice\'s ispTRACY. This article takes Altera\'s SignalTap II as an example to discuss the working principle and online debugging of embedded logic analyzers.
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