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Serial Bus Analysis
R&S
®
RTC1000
129User Manual 1335.7352.02 ─ 04
BYTE OFFSET ← DATA
Defines the number of bytes to be ignored before the relevant bytes of the trigger con-
dition. Usually, the byte offset is zero if the trigger is to occur on the maximum first 24
bits after the address.
NUMBER OF BYTES ← DATA
Defines how many bytes are to be analyzed for the trigger condition.
PATTERN INPUT ← DATA
You can define the bit pattern in binary or hexadecimal format.
If binary input is selected, use "SELECT BIT" and the [Universal] knob to select the bit.
Then press "STATE" to set the state H (=1), L (=0) or X (do not care) for the selected
bit. The state X defines any state. Repeat until all bits are set.
If hexadecimal input is selected, only the entire byte can be set to X. Use the softkey
"SELECT BYTE" to choose one of the bytes, depending on the available number of
bytes. Use the softkey "VALUE" and the [universal] knob to set the byte value. The
active byte is marked with a green border in the display window of the trigger condition
(see
Figure 11-5).
11.3.3
I
2
C Decode Results
Certain portions of the I
2
C messages are displayed in color to distinguish between the
different parts. If the data lines are selected in the bus table, the respective sections
are also displayed in color.
●
Read address: Yellow
●
Write address: Magenta
●
Data: Cyan
●
Start: White
●
Stop: White
●
No acknowledge: Red
●
Acknowledge: Green
The bus table lists the decode results. See also:
Chapter 11.2, "Bus Table: Decode
Results"
, on page 122.
I
2
C Bus (Option R&S RTC-K1)
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