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5989-7650EN Datasheet(PDF) 6 Page - Agilent(Hewlett-Packard) |
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5989-7650EN Datasheet(HTML) 6 Page - Agilent(Hewlett-Packard) |
6 / 13 page 5 Mixed-signal and serial bus applications Serial bus measurements are another application area where segmented memory acquisition is useful. You can optimize the number of packetized serial communication frames that can be captured consecutively by selectively ignoring (not digitizing) unimportant idle time between frames. As mentioned earlier, Agilent’ s InfiniiVision Series oscilloscopes are the only scopes on the market today that not only can acquire segments of up to four analog channels of acquisition, but also can capture time-correlated segments on digital channels of acquisition (using an MSO model), along with hardware-based serial bus protocol decoding. The segmented memory option on Agilent’s InfiniiVision Series oscilloscopes is compatible with all of the following serial bus triggering and decoding options: • I2C/SPI (N5423A or Option LSS) • RS-232/UART (N5457 or Option 232) • CAN/LIN (N5424A or Option AMS) To illustrate how segmented memory acquisition can enhance serial bus measurements, we will examine a mixed-signal automotive CAN bus measurement application. Figure 3 shows a CAN bus measurement with the scope set up to trigger on every start-of-frame (SOF) condition. Using this triggering condition with the segmented memory acquisition mode turned on, the scope easily captures 1000 consecutive CAN frames for a total acquisition time of 2.4 seconds. After acquiring the 1000 segments/ CAN frames, we can easily scroll through all frames individually to look for any anomalies or errors. In addition, we can easily make latency timing measurements between frames using the segmented memory’s time-tagging. Also note that in this measurement example, eight time-correlated digital channels were acquired along with the analog CAN signal and decoding. Figure 3: Capturing 1000 consecutive decoded CAN frames using segmented memory. |
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