Serial bus analysis
R&S
®
RTA4000
267
User Manual 1335.7898.02 ─ 08
Data
Specifies the data pattern if "SPI Trigger" is set to "Serial Pattern". When the instru-
ment detects the specified data pattern, it sets the trigger to the first bit of this pattern.
An example of pattern definition is shown in
.
To enter the binary value of any bit, tap this bit. To enter the hexadecimal value, tap
one of the nibbles (half byte) in the lower data line.
If a nibble (half byte) contains 1, 2 or 3 "X" bits (don't care), the nibble value is repre-
sented by the character "$". If all 4 bits of a nibble are "X", the nibble itself is "don't
care", represented by the character "X".
Remote command:
13.2.4
SPI decode results
When the configuration of the serial bus is complete, the signal can be decoded:
1. In the "Bus" menu, enable "Decode".
2. In the "Display" menu, select the result display settings.
Chapter 13.1.2, "Displaying decode results"
3. In the "Bus Table" menu, enable the "Bus Table". Adjust the table settings.
Chapter 13.1.3, "Bus table: decode results"
The instrument captures and decodes the signal according to the protocol definition
and the configuration settings.
The color-coding of the various protocol sections and errors simplifies the interpretation
of the visual display. The decode information condenses or expands, depending on the
horizontal scale. Various data formats are available to show the result values.
SPI bus (option R&S
RTA-K1)
