3-31
IM 701450-51E
SPI Bus Signal Analysis Function
3
Chip Select Signal: CS (SS)
You can select the signals of CH4 to CH8 or logic input (A0 to A7 of Pod A) for the CS
signal on the SPI Bus. CH5 to CH8 can be used on the DL7480. The logic input is
optional.
• Level for Determining the Status of the CS Signal: CH Level
When the channel signal is set to be the CS signal, you can set the level for
determining the high (H) or low (L) status of the CS signal for each channel. The
selectable range is eight divisions within the screen. The resolution is 0.01 V/div.
• Use/Not Use as a CS Signal
You can select whether the channel is to be a CS signal (ON/OFF) for each channel
CH4 to CH8 or logic input (A0 to A7 of Pod A).
• Enable Status of CS Signal: Enable State
You can select the enable status of the CS signal. The setting applies to all CS
signals.
H For a channel signal, this is the status when the signal is higher than the level for determining
the status of the CS signal. For a logic input signal, this is the status when the signal is 1.
The I/O data is analyzed when the CS signal is H.
L For a channel signal, this is the status when the signal is less than the level for determining
the status of the CS signal. For a logic input signal, this is the status when the signal is 0.
The I/O data is analyzed when the CS signal is L.
X Select this status when not determining the status. All the I/O output data are analyzed. The
byte boundary of the data being analyzed is the point where the CS signal changes from high
to low or low to high. This status cannot be selected when multiple signals are enabled as
CS signals.
– When none of the signals are enabled as a CS signal, this indicator is displayed and cannot
be changed. All the I/O output data are analyzed. The data to be analyzed is the I/O data
that is divided at the byte level from the analysis reference point (see the next page). Select
this status when analyzing the I/O data without using the CS signal.
• Priority
Priority exists in the CS signals. When multiple CS signals are enabled, the I/O data
corresponding to the CS signal with a high priority is analyzed. The priority in
descending order is CH4, CH5, ... , CH8, PodA A0, A1, ..., and A7. When the
analysis data is displayed, the name of the CS signal (CH4, CH5, ... , CH8, PodA A0,
A1, ..., and A7) that was used when the I/O data was analyzed is displayed in the
location where the enable status of the CS signal is displayed.
Analysis Reference Point
You can set the reference point where the analysis is to start. The first analysis data as
viewed from this reference point is assigned the analysis number 0. For details on the
assignment of the analysis number, see “Analysis Numbers” on the next page.
Trigger
Sets the reference point to the trigger position.
Manual
You can set the reference point in the range of
±
5 divisions. The resolution is 10
division
÷
display record length.
3.5 Analyzing/Searching Data
