5989-7650EN datasheet(6/13 Pages) HP

Part #	5989-7650EN

Description	Segmented Memory Acquisition for Agilent InfiniiVision Series Oscilloscopes

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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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