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L9679P Datasheet(PDF) 192 Page - STMicroelectronics |
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L9679P Datasheet(HTML) 192 Page - STMicroelectronics |
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192 / 279 page  Safing logic L9679P 192/279 DS11627 Rev 7 12.2 SPI sensor data decoding Sensor data is regularly communicated with the main microcontroller through multiple SPI messages. The L9679P 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 50. 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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