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L9680 Datasheet(PDF) 200 Page - STMicroelectronics |
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L9680 Datasheet(HTML) 200 Page - STMicroelectronics |
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200 / 286 page  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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