L9680 datasheet(181/286 Pages) STMICROELECTRONICS

181 / 286 page

DS11615 Rev 7

181/286

L9680

Remote sensor interface

285

Figure 42. Remote sensor synchronization pulses

L9680 supports three time slots in a sync period with associated RSDRx registers. The

messages received within one sync period are routed to the corresponding RSDRx register

associated to each time slot. A time slot control is performed to check if the incoming

messages fall within the valid time slots reported in Table 63 and sketched in Figure 43 If

the end of the received message occurs outside a valid time slot, a SLOT_ERROR fault will

be detected and stored in the related RSDRx register. Slot error assignment is described in

Figure 43. For instance, if the end of second message falls before the expected valid time

window the error slot 1 is asserted and then also the data received with the first message is

lost. If two messages end within the same slot, the second message will be assigned to that

slot, regardless its validity. The time slot control can be disabled by setting the TSxDIS bit in

the RSCRx register.

Figure 43. PSI5 slot timing control

SATFD4

SATFD3

SATFD2

SATFD1

SATSYNC

SATFD4

SATFD3

SATFD2

SATFD1

SATSYNC

SATFD4

SATFD3

SATFD2

SATFD1

SATSYNC

GAPGPS02284

328.9

T_ES_1

T_LS_1

T_EE_1

T_LE_1T_ES_2 T_LS_2

T_EE_2

T_LE_2 T_ES_3 T_LS_3

T_EE_3

T_LE_3

T_s1_end_open(min)

T_s1_end_open(max)

T_s1_end_closure(min)

T_s1_end_closure(max)

PSI5 frames

From Satellite

Frame end

Detect windows

Slot 1

Slot 2

Slot 3

Receiver

Response

Error Slot 1

Valid

Slot 1

Error Slot 1

Valid

Slot 2

Error

Slot 2

Valid

Slot 3

Error Slot 3

SYNC PULSE ENABLE

SATSYNC PIN

Stop bit not

included

T_s2_end_open(min)

T_s2_end_open(max)

T_s3_end_open(min)

T_s3_end_open(max)

T_s2_end_closure(min)

T_s2_end_closure(max)

T_s3_end_closure(min)

T_s3_end_closure(max)

GAPGPS03314

L9680 Datasheet(PDF) 181 Page - STMicroelectronics

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