DS2143 datasheet(16/44 Pages) DALLAS

16 / 44 page

DS2143/DS2143Q

16 of 44

SSR: SYNCHRONIZER STATUS REGISTER (Address=1E Hex)

(MSB)

(LSB)

CSC5

CSC4

CSC3

CSC2

CSC0

FASSA

CASSA

CRC4SA

SYMBOL

POSITION

NAME AND DESCRIPTION

CSC5

SSR.7

CRC4 Sync Counter Bit 5. MSB of the 6-bit counter.

CSC4

SSR.6

CRC4 Sync Counter Bit 4.

CSC3

SSR.5

CRC4 Sync Counter Bit 3.

CSC2

SSR.4

CRC4 Sync Counter Bit 2.

CSC1

SSR.3

CRC4 Sync Counter Bit 0. LSB of the 6-bit counter. The next

to LSB is not accessible.

FASSA

SSR.2

FAS Sync Active. Set while the synchronizer is searching for

alignment at the FAS level.

CASSA

SSR.1

CAS MF Sync Active. Set while the synchronizer is searching

for the CAS MF alignment word.

CRC4SA

SSR.0

CRC4 MF Sync Active. Set while the synchronizer is searching

for the CRC4 MF alignment word.

CRC4 SYNC COUNTER

The CRC4 Sync Counter increments each time the 8ms CRC4 multiframe search times out. The counter

is cleared when the DS2143 has successfully obtained synchronization at the CRC4 level. The counter

can also be cleared by disabling the CRC4 mode (CCR.0=0). This counter is useful for determining the

amount of time the DS2143 has been searching for synchronization at the CRC4 level. Annex B of

CCITT G.706 suggests that if synchronization at the CRC4 level cannot be obtained within 400 ms, then

the search should be abandoned and proper action taken. The CRC4 Sync Counter will rollover

DS2143 Datasheet(PDF) 16 Page - Dallas Semiconductor

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