Eye graph testing is a commonly used signal analysis and testing method, especially for interfaces with standardized requirements, such as USB, Ethernet, SATA, HDMI, and optical interfaces. The eye chart testing of these standard interface signals is mainly carried out using oscilloscopes with MASK (template), including general-purpose oscilloscopes, sampling oscilloscopes, or signal analyzers. These oscilloscopes have built-in clock extraction functions that can display eye charts. For oscilloscopes without MASK, external clocks can be used for triggering. Eye pattern template testing is widely used in today's serial bus applications. Eye maps are usually derived from the infinite continuous superposition of all captured bits in an oscilloscope, used to display when these bits are valid. Eye maps can comprehensively display the overall quality of system physical layer features, including amplitude changes, timing uncertainties, and occasional signal anomalies What is eye graph testing? Simply put, an eye pattern is a series of bit cycles superimposed on the horizontal axis of an oscilloscope to form an eye like waveform. The eye map is actually the display of a series of different binary codes of digital signals accumulated in a certain pattern on the oscilloscope screen. Due to the oscilloscope's afterglow function, as long as all the captured waveforms are stacked and accumulated in every three bits, an eye map is formed The formation of eye maps? The eye map is actually the display of a series of different binary codes of digital signals accumulated on the oscilloscope screen according to a certain pattern. Simply put, due to the oscilloscope's afterglow function, as long as all the captured waveforms are stacked and accumulated in every three bits (as shown in the above figure), an eye map is formed