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L9663 数据表(PDF) 28 Page - STMicroelectronics |
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L9663 数据表(HTML) 28 Page - STMicroelectronics |
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28 / 106 page  Satellite interface L9663 28/106 DS11401 Rev 6 Each PSI5 data frame consists of a total p bits containing: two start bits (S1 and S2), one parity bit (P) with even parity or alternatively 3 CRC bits (C0, C1, C2), and a data region (D0 … D[k-1]) with k = 8…28 bit. The total length of a PSI5 frame is p=k+3 data bits (in case of frames with parity bit) or p=k+5 data bits (in case of frames with CRC). Data bits are transmitted LSB first. The parity or CRC check bits cover the bits of the entire data region. Figure 14. PSI5 v1.3 frame Figure 15. PSI5 v2.0 frame GAPGPS01675 Data Region (k = 8, 10, 16, 20, 24 bit) C0 C1 C2 CRC or parity 1, 3 bit S2 S1 Start bits 2 bit D[k-2] D[k-1] D0 D[k-3] PSI5 Frame p = 11 .. 29 bit GAPGPS01676 B1 Data Region (k = 10..28 bit) C0 C1 C2 CRC or parity 1, 3 bit Status optional 0, 1 or 2 bit S2 S1 Start bits 2 bit A[n-2] A[n-1] A0 B[m-1] B0 F[q-1] F0 E0 M1 M0 Frame control optional 0, 1, 2, 3, 4 bit Messaging optional 0, 2 bit E[r-1] Payload Data Region 1 n = 10…24 bit 1bit granularity D[k-1] D2 D1 D0 A[n-3] D[k-2] D[k-3] PSI5 Frame p = 13 .. 33 bit Payload Data Region 2 (optional) m = 0…12 bit 1bit granularity |
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