Examples Of Spi Bus Signal Trigger Conditions - YOKOGAWA DL7480 User Manual

3.4 Setting SPI Bus Signal Acquisition Conditions

Examples of SPI Bus Signal Trigger Conditions

3-16
The trigger point is set to the position below depending on the SCK edge slope setting
(see page 3-7).
1 2
SCK
MOSI
or
MISO
This section will indicate the data sequence at the byte level in hexadecimal and indicate
the position where the trigger will occur.
The shaded section is the figure indicates the byte pattern (sequence) that is compared.
• Slave Select Assert Trigger
Trigger Condition
SS: L
A Pattern (MOSI): Not applicable
B Pattern: Not applicable
<Byte Count=0>
MOSI 11 A4
MISO 00 00
SS
Trigger activated here
<Byte Count=3>
MOSI 11 A4
MISO 00 00
SS
Skip 3 bytes
• Activate a Trigger Only on Pattern A
Trigger Condition
SS: L
A Pattern (MOSI): A4 25
Data Byte: 2
Condition: True
B Pattern: Not applicable
Compare with Pattern A
MOSI 11 A4
MISO 00 00
SS
3 4 5 6 7
25 EA 57 FF
00 00 00 00
25 EA 57 FF
00 00 00 00
Trigger activated here
25 EA 57 FF
00 00 00 00
Trigger activated here
Matches with the specified Pattern A
8
Trigger point when
the SCK edge slope is
Trigger point when
the SCK edge slope is
68 00 00 00
00 85 C8 22
68 00 00 00
00 85 C8 22
68 00 00 00
00 85 C8 22
IM 701450-51E