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L9300 Datasheet(PDF) 91 Page - STMicroelectronics

Part # L9300
Description  Automotive flexible U-chip for braking and transmission
PDF  182 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9300 Datasheet(HTML) 91 Page - STMicroelectronics

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14.1.4
Seed generation and answer check
Seeds are 8-bit wide word generated by an LSFR pseudo-random algorithm. A new seed is generated and sent
onto an SPI word, WD_Seed, each time a new Seed request, T_start_REQ, is sent to the ASIC.
Figure 57. Seed generation algorithm block diagram
Seed
0
1
2
3
4
5
6
7
1
clk_4µs
Good
Answer
received
GADG0408171240PS
Seed is generated by freezing the 8-bit wide free running LSFR, running at a WD_clk clock period, each
T_start_REQ event.
As described in Figure 57, seed is generated by the LSFR algorithm. At each clock period (4 µs clock) the new
seed is generated according to the LSFR algorithm. A new seed is stored onto the WD_Seed only in case of a
correct answer received. In case of an error, the same seed is available onto the WD_Seed until a correct answer
is received.
Figure 58. Seed selection and elaboration flow
Microcontroller
ASIC
ANSWER WRITE
ANSWER CHECK
SEED
SENT SEED
OLD SEED
NEW SEED
SEED
SENT SEED
SEED
=
NEW SEED
SEED
=
OLD SEED
SEED
SEED_READ
SEED_ELABORATION
SEED_READ
ANSWER OK?
GADG0408171311PS
L9300
Q&A watchdog functional description
DS12258 - Rev 4
page 91/182



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