398 Agilent InfiniiVision 3000 X-Series Oscilloscopes User's Guide
26 I2S Triggering and Serial Decode
6 For the SCLK (serial clock), WS (word select), and SDATA (serial data)
signals:
a Connect an oscilloscope channel to the signal in the device under
test.
b Press the SCLK, WS, or SDATA softkey; then, turn the Entry knob to
select the channel for the signal.
c Press the corresponding Threshold softkey; then, turn the Entry knob
to select the signal threshold voltage level.
Set the threshold levels for the SCLK, WS, and SDATA signals to the
middle of the signals.
The threshold voltage level is used in decoding, and it will become
the trigger level when the trigger type is set to the selected serial
decode slot.
The SCLK, WS, and SDATA labels for the source channels are
automatically set.
7 Press the Back/Up key to return to the Serial Decode Menu.
8 Press the Bus Config softkey to open the I
2
S Bus Configuration Menu
and display a diagram showing WS, SCLK, and SDATA signals for the
currently specified bus configuration.
9 Press the Word Size softkey. Turn the Entry knob to match the
transmitter word size of the device under test (from 4 to 32 bits).
10 Press the Receiver softkey. Turn the Entry knob to match the receiver
word size of the device under test (from 4 to 32 bits).
11 Press the Alignment softkey; then, turn the Entry knob to select the
desired alignment of the data signal (SDATA). The on- screen diagram
changes with your selection.
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