Serial bus analysis
R&S
®
RTM3000
266User Manual 1335.9090.02 ─ 09
Source
If both MOSI and MISO lines are configured for analysis, select which line is the trigger
source.
Remote command:
TRIGger:A:SOURce:SPI on page 613
SPI Trigger
Selects the trigger condition.
"Frame Start"
Sets the trigger to the start of the message:
●
For SPI with CS, the frame starts when the chip select signal CS
changes to the active state.
●
For SPI without CS, the frame starts when the idle time has
expired.
"Frame End"
Sets the trigger to the end of the message.
●
For SPI with CS, the frame ends when the chip select signal CS
changes to the inactive state.
●
For SPI without CS, the frame ends when the idle time has
expired after the last clock and no new clock appeared during that
time.
"Bit <x>"
Sets the trigger to the bit number specified with "Bit Offset"
on page 266.
"Serial Pattern"
Expands the trigger setup dialog to configure the bit pattern to be trig-
gered at. Set "Number of Bits" on page 266 and "Data" on page 267
to define the pattern, and "Bit Offset" on page 266 to define the pat-
tern position.
Remote command:
TRIGger:A:SPI:MODE on page 613
Bit Offset
Specifies the number of bits before the first bit of the pattern. These bits are ignored.
The first bit after frame start is Bit 1. For example, with bit offset = 2, Bit 1 and Bit 2 are
ignored, and the pattern starts with Bit 3.
If "SPI Trigger" is set to "Bit <x>", the trigger is set to the next bit that follows the offset
bits. For example, if the bit offset is 4, the instrument triggers on the start of the 5th bit.
Remote command:
TRIGger:A:SPI:POFFset on page 614
Number of Bits
Defines the length of the serial pattern in bits.
Note: Entering data bits beyond the specified length of the pattern automatically
adjusts the "Number of Bits" to include all entered bits.
Remote command:
TRIGger:A:SPI:PLENgth on page 614
SPI bus (option R&S
RTM-K1)
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