2-13
IM 701610-61E
SPI Bus Signal Analysis Function
2
Analysis Range
Analysis is performed on the acquisition data within the display screen. Up to 40000
bytes of the analysis results can be displayed. The displayed result varies depending on
the number of bytes analyzed as follows:
• When the total analysis result is less than or equal to 40000 bytes
All points are displayed regardless of the position of the Reference Point.
• When the total analysis result is greater than 40000 bytes
The displayed result varies depending on the number of analysis results on the Pre
*
and Post
*
sides as follows:
• When the Pre side = 30000 and the Post side = 30000
→
Pre side = 20000 and
Post side = 20000
• When the Pre side = 10000 and the Post side = 50000
→
Pre side = 10000 and
Post side = 30000
• When the Pre side = 50000 and the Post side = 10000
→
Pre side = 30000 and
Post side = 10000
*
Pre:
Start from the reference point and display back (to the left)
Post:
Start from the reference point and display forward (to the right)
Notes When Performing Analysis
• Analysis and search cannot be performed while the waveform acquisition is started.
• Analysis and search cannot be performed on accumulated waveforms.
Executing the Analysis
When analysis is performed, the results are listed on the right side of the screen.
• List of Analysis Results
The following four items are displayed.
No.
*
:
Up to 40000 points can be displayed.
Dt1 and Dt2:
The data of Data1 and Data2 is displayed using hexadecimal notation.
However, if a byte of data is less than 8 bits, the data is not displayed.
If indefinite data exists, “*” is displayed. Indefinite data is considered
the same value as the previous bit for the analysis. If the first data is
indefinite, it is considered 0.
CS:
Displays the CS signal state. Displays blank when the CS signal is not
set. Displays “H” or “L” when the CS signal is set.
Depending on whether the CS signal is set, the 0
th
byte varies as follows:
• When the CS signal is not set:
The first detected byte after the reference point
Reference point
No.-1
7
8
1
2
3
4
5
6
Data
Clock
7
8
1
2
No.0
No.1
2.4 Analyzing/Searching Data
