DS2143 datasheet(10/44 Pages) DALLAS

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DS2143/DS2143Q

10 of 44

SYNC/RESYNC CRITERIA Table 2

FRAME OR

MULTIFRAME

LEVEL

SYNC CRITERIA

RESYNC CRITERIA

ITU

SPEC.

FAS

FAS present in frames N and N

+ 2, and FAS not present in

frame N + 1.

Three consecutive incorrect FAS

received.

Alternate (RCR1.2=1) the above

criteria is met or three consecutive

incorrect bit 2 of non-FAS received.

G.706

4.1.1

4.1.2

CRC4

Two valid MF alignment words

found within 8 ms.

915 or more CRC4 code words out

of 1000 received in error.

G.706

4.2

4.3.2

CAS

Valid MF alignment word

found and previous time slot 16

contains code other than all 0s.

Two consecutive MF alignment

words received in error.

G.732

5.2

RCR2: RECEIVE CONTROL REGISTER 2 (Address=11 Hex)

(MSB)

(LSB)

Sa8S

Sa7S

Sa6S

Sa5S

Sa4S

SCLKM

ESE

SYMBOL

POSITION

NAME AND DESCRIPTION

Sa8S

RCR2.7

Sa8 Bit Select. Set to 1 to report the Sa8 bit at the RLINK pin;

set to 0 to not report the Sa8 bit.

Sa7S

RCR2.6

Sa7 Bit Select. Set to 1 to report the Sa7 bit at the RLINK pin;

set to 0 to not report the Sa7 bit.

Sa6S

RCR2.5

Sa6 Bit Select. Set to 1 to report the Sa6 bit at the RLINK pin;

set to 0 to not report the Sa6 bit.

Sa5S

RCR2.4

Sa5 Bit Select. Set to 1 to report the Sa5 bit at the RLINK pin;

set to 0 to not report the Sa5 bit.

Sa4S

RCR2.3

Sa4 Bit Select. Set to 1 to report the Sa4 bit at the RLINK pin;

set to 0 to not report the Sa4 bit.

SCLKM

RCR2.2

SYSCLK Mode Select.

0 = if SYSCLK is 1.544 MHz.

1 = if SYSCLK is 2.048 MHz.

ESE

RCR2.1

Elastic Store Enable.

0 = elastic store is bypassed.

1 = elastic store is enabled.

RCR2.0

Not Assigned. Should be set to 0 when written to.

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