106
3000 X-Series Oscilloscopes Advanced Training Guide
4
Serial Bus Decoding & Triggering, Search & Navigation, and Segmented Acquisition Labs
You should now see three digital waveforms captured by the scope’s digital
channels of acquisition similar to
. These I
2
S training signals are
being generated by the scope’s built- in pattern generator and routed
directly to the scope’s digital acquisition system; bypassing the logic probe.
Note that in a real measurement application such as this, you would use
the scope’s analog inputs and/or logic probe to capture these signals from
your system.
D9 is the audio serially encoded data signal (SDATA), D8 is the serial
clock signal (SCLK), and D7 is the Word Select signal (WS). Let’s now set
up the scope to decode these I
2
S signals.
12
Press the
[Serial]
front panel key.
13
Press the
Mode I
2
C
softkey; then select
I
2
S
using the Entry knob.
14
Press the
Signals
softkey.
15
Press the
SCLK
softkey; then select
D8
as the clock source using the
Entry knob.
16
Press the
WS
softkey; then select
D7
using the Entry knob.
17
Press the
SDATA
softkey; then select
D9
using the Entry knob.
18
Press the
(Back) front panel button to return to the previous menu.
19
Press the
Bus Config
softkey; then verify that
Word Size
is set to “8”,
Receiver
is set to “8”,
Alignment
is set to “Standard I
2
S”,
WS Low
is set to
“Left channel”,
SCLK Slope
is set “rising edge”.
Figure 79 Capturing I
2
S signals using the scope’s digital channels of acquisition (MSO).
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