12 I
2
S Triggering and Serial Decode
302 InfiniiVision 7000B Series Oscilloscopes User’s Guide
Setup for I
2
S Signals
An I
2
S (Inter- IC Sound or Integrated Interchip Sound) trigger setup
consists of connecting the oscilloscope to the serial clock, word select, and
serial data lines.
To set up the oscilloscope to capture I
2
S signals, use the Signals and
Bus Config softkeys which appear in both the Trigger Menu and the Serial
Decode Menu:
1 Press [Label] to turn on labels.
2 Press [Trigger]; then, select the I
2
S trigger type.
3 Press Signals to open the I
2
S Signals Menu.
A diagram appears showing WS, SCLK, and SDATA signals for the
currently specified bus configuration.
4 Connect an oscilloscope channel to the SCLK (serial clock) line in the
device under test. (If the channel is not already switched on, switch it
on now, and return to this menu by pressing [Trigger] > Signals.)
Rotate the Entry knob to set the SCLK clock channel softkey to the
SCLK channel.
As you rotate the Entry knob the SCLK label for the source channel is
automatically set and the channel you select is shown in the
upper- right corner of the display next to “I
2
S”.
5 Connect an oscilloscope channel to the WS (word select) line in the
device under test, switch the channel on, then set the WS channel
softkey to that channel.
To Next Page
Need help?
General
