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L9680 bảng dữ liệu(PDF) 200 Page - STMicroelectronics

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Safing logic
L9680
200/286
DS11615 Rev 7
12.2
SPI sensor data decoding
Sensor data is regularly communicated with the main microcontroller through multiple SPI
messages. The L9680 monitors SPI traffic on MISO_RS bus. Since not all communications
between sensors and the microcontroller contain data, it is important for the decoder to
properly sort the communications and extract only the targeted data. The solution involves
defining specific masking functions, contained within independent safing records,
programmed by the user. The following figures detail the SPI message decoding methodology
and the ensuing comparisons of valid sensor data to the programmed thresholds.
Figure 52. Safing engine – 32-bit message decoding flow chart
i=1
CC[i] = 0?
CS[i] =
cs_active?
IF[i] = 1?
N
Y
Y
N
Y
match[i]=1
matchCC[i]=1
match[i]=0
i++
Y
N
N
i = N?
Y
N
Outputs to VALDAT function :
dataresult[i]
req_ok[i]
match[i]
A
B
EN_SAF(i)
= 1?
Y
N
MSGDEC32
SPIFLDSEL[i]?
RESPTARG[i]=
1st16[MISO]&
RESPMASK[i]
RESPTARG[i]=
2nd16[MISO]&
RESPMASK[i]
1st16
req_ok[i]
= 1?
N
Y
2nd16
dataresult[i] =
1st16[MISO] &
DATAMASK [i]
dataresult[i] =
2nd[MISO] &
DATAMASK [i]
N
Y
REQTARG[i]=
MS16[MOSI]&
REQMASK[i]?
Y
N
match[i]=0
match[i]=0
Y
N
SPIFLDSEL[i]?
RESPTARG[i]=
1st16[MISO]&
RESPMASK[i]
RESPTARG[i]=
2nd16[MISO]&
RESPMASK[i]
1st16
2nd16
dataresult[i] =
1st16[MISO] &
DATAMASK [i]
dataresult[i] =
2nd[MISO] &
DATAMASK [i]
N
Y
match[i]=0
req_ok[i]=0
match[i]=0
req_ok[i]=0
req_ok[i]=1
req_ok[i]=0
REQTARG[i]=
MS16[MOSI]&
REQMASK[i]?
Y
N
match[i]=1
matchCC[i]=1
req_ok[i]=0
i = Safing Record index:
1: SR1
2: SR2
3: SR3
4: SR4
N=5 (L9678)
N=10 (L9679)
N=14 (L9680)
GAPGPS02292



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