05 | Keysight | U4164A Logic Analyzer Module - Data Sheet

Figure 1B. DDR4 3300 Mb/s burst trigger for specific write DQ burst.

Product Description (Continued)

Figure 1B shows the trigger setup to capture a burst of eight DDR4 writes using the unique

Keysight burst trigger that captures precise sequences of two to eight patterns per burst

recognizer. (The U4164A has up to eight burst detectors.) The trigger sequencer operates up

to 2.5 GHz, enabling accurate and precise triggering on DDR4 read or write bursts of DQ up to

4 Gb/s with each DQ sampled simultaneously for both a rising edge and falling edge sample.

Notice that the exact write DQ burst in the trigger is at the trigger point in both the waveform

and listing displays. The trigger marker is red and is found at the last sample in the DDR4 write

burst. The green marker is for the start of the write burst and the yellow marker in the listing is

at the write command where the B4661A DDR4 decoder has assembled the DQ with the write

command and associated row and column addresses.

Figure 1C. DDR4 3300 Mb/s listing.

Figure 1C shows the state listing and Figure 1D shows the waveform for this capture using the

B4661A DDR decoder. Figure 1E shows the transaction decode option and traffic overview of

the DDR4 3300 Mb/s trace using the B4661A performance analysis software.