2-13
IM 701730-51E
SPI Bus Signal Analysis Function
2
Combination of Pattern A and Byte Count Trigger
• Trigger Condition
SS:
L
A Pattern (MOSI):
A4 25
Data Byte:
2
Condition:
True
Byte Count:
3
B Pattern:
Not applicable
11
A4
25
EA
57
FF
68
00
00
00
Trigger activated here
MOSI
00
00
00
00
00
00
00
85
C8
22
MISO
SS
Matches with the specified Pattern A
Skip 3 bytes
Compare with Pattern A
Activate a Trigger Only on Pattern B (MOSI)
• Trigger Condition
SS:
L
A Pattern (MOSI):
Not applicable
B Pattern (MOSI):
A4 25
Data Byte:
2
Condition:
True
<After Byte Count=First Byte>
11
A4
25
EA
57
FF
68
00
00
00
Trigger activated here
MOSI
00
00
00
00
00
00
00
85
C8
22
MISO
SS
Matches with the specified Pattern B
Compare with Pattern B
<After Byte Count=Anywhere>
11
A3
A4
25
EA
A4
25
00
00
00
Trigger activated here
MOSI
00
00
00
00
00
00
00
85
C8
22
MISO
SS
Compare with the specified Pattern B
until a match occurs
Compare with Pattern B
Compare with Pattern B
Compare with Pattern B
*
* Trigger does not activate on “A4” and “25”, because the comparison is made on 2 bytes.
2.4 Setting SPI Bus Signal Acquisition Conditions