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L9396 データシート(PDF) 77 Page - STMicroelectronics

部品番号 L9396
部品情報  Automotive multiple power supply IC
PDF  109 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9396 データシート(HTML) 77 Page - STMicroelectronics

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DS12539 Rev 6
77/109
L9396
System functional safety implementations
108
Figure 19. Seed generation algorithm block diagram
Seed is generated by the LSFR algorithm in Figure above. In particular the algorithm
generates a 7-bit length word, while the seed has 8 bits including a zero as MSB. In this way
the seeds are always positive. A new seed will be stored onto the WD_Seed only in case of
a correct answer received. In case of an error, the same seed will be available into the
WD_Seed until a correct answer will be received.
Figure 20. Seed selection and elaboration flow
Figure 21. Answer check generation algorithm block diagram
The answer is a 16-bit long word checked against a 16-bit word composed by two bytes,
Answer_Low and Answer_High, generated from the sent seed. Answer_Low is the logical
2's complement of the seed, while Answer_High is a replica of the seed being sent.
Seed
0
1
2
3
4
5
6
7
+
+
+
+
+
1
GADG2401171600PS
T_start_REQ
Microcontroller
ASIC
ANSWER WRITE
ANSWER CHECK
SEED
SENT SEED
OLD SEED
NEW SEED
SEED
SENT SEED
ANSWER OK ?
SEED
=
NEW SEED
SEED
=
OLD SEED
SEED
GADG2401171606PS
SEED_READ
SEED_ELABORATION
SEED_READ
Answer Low
0
1
2
3
4
5
6
7
8
9
10
11
12
13
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15
Answer High
Seed
! Seed
0
1
2
3
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7
0
1
2
3
4
5
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7
GADG2401171609PS



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