Serial Bus Analysis
R&S
®
RTC1000
133User Manual 1335.7352.02 ─ 02
2. Press "SOURCE" to select the clock ("Clk"), data line ("Data"), and the timeout
("Time").
3. If "Clk" is selected:
a) Press "CLOCK".
b) Select the input channel of the clock line.
c) Press "SLOPE" to decide whether the data is stored with rising or falling slope
(rising slope is the default setting).
4. If "Data" is selected:
a) Press "DATA".
b) Select the input channel of the data line.
c) Press "ACTIVE" to assign whether data is high or low active (high active is the
default setting).
5. If "Time" is selected, press "TIME OUT". Use the UNIVERSAL knob to set the idle
time.
6. Use the top softkey "SOURCE" to select the respective channel for clock ("Clk")
and data ("Data") or to select the time-out time ("Time").
During the time-out, data and clock line are at Low. When the time-out has been
reached, a new frame begins. If the time intervals between the data packets are
shorter than the time-out, these packets belong to the same frame. A small window
provides information about the current settings.
7. Press "BIT ORDER" to determine if the data of each message starts with the
"MSB" (most significant bit) or the "LSB" (least significant bit).
8. Press "WORD SIZE" to select with the UNIVERSAL knob how many bits are inclu-
ded in each message. You can select a value between 1 bit and 32 bits.
11.4.2 SPI / SSPI Bus Triggering
After the bus configuration is completed, you can trigger on various events.
To trigger on events
1. In the Trigger section, press the TYPE key.
2. Select "SERIAL BUS".
3. Press the SOURCE key in the Trigger section.
4. Choose "SPI" or "SSPI" by pressing the respective softkey.
The bus is only available if it is configured correctly.
5. Press the FILTER key in the Trigger section to list the trigger conditions of the bus.
6. Configure the trigger condition. Possible conditions are described below.
7. Press the Back softkey until all menus are closed.
SPI / SSPI BUS (Option R&S RTC-K1)
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