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Understanding and Performing USB 2.0 Physical Layer Testing and Debugging

Time-Correlated Bus Decode

Time-correlated displays of complex system interactions

are critical to efﬁcient embedded system debug, including

combinations of analog and digital signals, parallel buses,

and serial buses. The MSO/DSA/DPO70000C, DPO7000C,

and MSO/DPO5000 Series oscilloscopes with the SR-USB

application software can decode and display up to 16 buses

at a time, while the MSO/DPO4000B Series oscilloscope with

the DPO4USB application module can decode and display up

to 4 buses. The buses are displayed in color-coded bus forms

that are time correlated with the analog and digital signals.

Figure 15 shows an acquisition with USB 2.0 high-speed

decode, Ethernet 100BASE-TX with TCP/IPv4 decode, I

decode, SPI decode, and two analog signals which are all

time-correlated. This single display provides in-depth insight to

the operation of this design.

Wave Inspector Navigation and Advanced

Search and Mark

The deep record lengths of these oscilloscopes represent

thousands of full-resolution screens of data. Even with

manually scrolling through the waveforms at the rate of

one screen (1,000 points/screen) per second, you could

spend hours looking at a single acquisition. The front panel

Wave Inspector controls on the MSO/DPO5000 and MSO/

DPO4000B Series provide manual navigation tools and

automated searches (including searches on serial buses) that

simplify the task of working with large acquisitions. The MSO/

DSA/DPO70000C, DPO7000C, and MSO/DPO5000 Series

offer Advanced Search and Mark which enables up to 8

simultaneous automatic search functions.

In Figures 15 and 16, the automated bus search ﬁnds 14

occurrences of a USB 2.0 Sync ﬁeld. These events are

marked with white hollow triangles above the waveforms. Now

that the USB 2.0 Syncs have been marked, navigating to the

beginning of each USB 2.0 packet is as simple as pressing the

front-panel Previous and Next arrow buttons. Also, you can

press the Set/Clear front-panel button to mark the acquisition

at other places of interest so that you can quickly return to

them for further analysis.

Figure 16. Simpliﬁed display, showing only the differential high-speed USB analog signal

and the decoded bus.

Figure 15. Acquisition showing USB 2.0 high-speed decode, Ethernet 100BASE-TX

with TCP/IPv4 protocol decode, I2C decode, SPI decode and two analog signals.

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