L9679P datasheet(177/279 Pages) STMICROELECTRONICS

177 / 279 page

DS11627 Rev 7

177/279

L9679P

Remote sensor interface

278

Figure 43. Manchester decoder state diagram

IDLE

RISING_EDGE

Strobe RESET_CNT

PERIOD_1_5

Strobe REC_END

Strobe RESET_CNT

(check PARITY_ERR)

ANY and

(PERIOD_0_75 or not FIRST)

PERIOD_1_5

Strobe RESET_CNT

Strobe MANY BITS

Strobe RESET_CNT

ANY and / PERIOD_1_5

Strobe RESET_CNT

RISING and PERIOD_0_75

Strobe RESET_CNT

(ANY and not PERIOD_1_25 and

PERIOD_0_75 and not STATE=C_NB)

Strobe RESET_CNT

Strobe NEXT BIT

PERIOD_1_25 and ANY

strobe CHECK_TIME

Strobe RESET_CNT

ANY and

not PERIOD_0_75 and

not FIRST_EDGE

Strobe RESET_CNT

Strobe CHECK_TIME

ANY and

PERIOD_0_75 and STATE=C_NB

Strobe RESET_CNT

Strobe NEXT BIT

DataFilt

:= Filtered Raw Data (RXSAT) from Current Demodulator (after deglitcher )

RISING_EDGE

:= DataFilt(n+1, n) == “01”

FALLING_EDGE := DataFilt(n+1, n) == “10”

ANY

:= RISING_EDGE or FALLING_EDGE

C_NB

:= 8bit frame configurated ? 10 : 12

STATE

:= {0@IDLE, 1@STATBITDET, 2@T5, STATE++@T12, 0xE @WAIT, 0xF@ERROR}

BitCounter

:= RESET_CNT ? 0 : BitCounter++

Period_1_50

:= BitCounter >= BitPeriod*1.5

Period_1_25

:= BitCounter >= BitPeriod*1.25

Period_0_75

:= BitCounter >= BitPeriod*0.75

FIRST_EDGE

:= Period_0_75? 1 : ANY? 0 : FIRST_EDGE after a delay of Tck (Remark: not a combinatorial signal )

RESET_DECODER

Strobe RESET_CNT

Period_1_25 and ANY_EDGE

Strobe RESET_CNT

(first pulse duty cycle check

: )

FALLING_EDGE before period_0_25

Strobe RESET_CNT

RISING_EDGE & /Period_0_75

Strobe RESET_CNT

WAIT

TGAP

DATA REC.

ERROR

START BIT

DET.

T2a

T10

T6b

T11

T12

T13

PERIOD_1_25 and not ANY

strobe CHECK_TIME

T6a

T2b

Period_1_25 and not ANY_EDGE

GAPGPS01645

L9679P Datasheet(PDF) 177 Page - STMicroelectronics

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