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IM DLM3054-01EN
Analyzing and Searching SPI Bus Signals (Option)
For the SPI time chart, see “
” in chapter 4, “Triggering.”
Bus Setup (Setup)
Wiring system (Mode)
This item is the same as that of the SPI bus signal.
Bit Order (Bit Order)
This item is the same as that of the SPI bus signal.
Clock (Clock), Data1 (Data1), Data2 (Data2), and Chip Select (CS (SS))
Set the clock, Data1, Data2, and chip select sources from the available waveforms below.
CH1 to CH4/LOGIC,
1
Math1 to Math4, or None (Don’t care)
2
1 CH4 or LOGIC, whichever the corresponding key is illuminated, can be selected. If you select LOGIC, select
the source bit (bit 0 to bit 7).
2 Only selectable for the chip select source. If you select None, set grouping to ON or OFF and the idle time (Idle
Time).
Clock Idle Time and Grouping (Idle time/Grouping)
When Grouping is set to ON, the decoded results are displayed starting from the first rising or falling clock
edge after the specified idle time. When Grouping is set to OFF, the data is decoded from the left of the
screen, regardless of the idle time setting.
You can turn grouping on and off and set the idle time when CS (SS) is set to None (don’t care).
Clock Polarity (Polarity) and Chip Select Active State (Active)
These items are the same as those of the SPI Bus trigger.
Level (Level) and Hysteresis (Hys)
These items are the same as those of the edge search.
Auto Setup (Auto Setup)
Executes auto setup based on the specified wiring system and the clock, Data1, Data2, and chip select sources.
The auto setup feature automatically configures the level and hysteresis, and triggers on the SPI signal’s first
data byte.
You cannot execute auto setup when:
• Any of the sources (i.e., clock, Data1, Data2, or chip select) is set to Math1 to Math4.
• State display is applied to any of the LOGIC bits set at the clock, Data1, Data2, or chip select.
• The chip select source is set to None (Don’t care).
15 Analyzing and Searching Serial Bus Signals