L9663 datasheet(28/106 Pages) STMICROELECTRONICS

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)

CRC or parity

1, 3 bit

Start bits

2 bit

D[k-2]

D[k-1]

D[k-3]

PSI5 Frame p = 11 .. 29 bit

GAPGPS01676

Data Region (k = 10..28 bit)

CRC or parity

1, 3 bit

Status

optional

0, 1 or 2 bit

Start bits

2 bit

A[n-2]

A[n-1]

B[m-1]

F[q-1]

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]

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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