DS2143 datasheet(22/44 Pages) DALLAS

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DS2143/DS2143Q

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BPVCR1:

UPPER BIPOLAR VIOLATION COUNT REGISTER 1 (Address=00 Hex)

BPVCR2:

LOWER BIPOLAR VIOLATION COUNT REGISTER 2 (Address=01 Hex)

(MSB)

(LSB)

BV7

BV6

BV5

BV4

BV3

BV2

BV1

BV0

BPVCR2

BV15

BV14

BV13

BV12

BV11

BV10

BV9

BV8

BPVCR1

SYMBOL

POSITION

NAME AND DESCRIPTION

BV15

BPVCR1.7

MSB of the bipolar violation count.

BV0

BPVCR2.0

LSB of the bipolar violation count.

Bipolar Violation Count Register 1 (BPVCR1) is the most significant word and BPVCR2 is the least

significant word of a 16-bit counter that records bipolar violations (BPVs). If the HDB3 mode is set for

the receive side via CCR.2, then HDB3 code words are not counted. This counter increments at all times

and is not disabled by loss of sync conditions. The counter saturates at 65,535 and will not rollover. The

bit error rate on a E1 line would have to be greater than 10**-2 before the BPVCR would saturate.

CRCCR1: CRC4 COUNT REGISTER 1 (Address=02 Hex)

CRCCR2: CRC4 COUNT REGISTER 2 (Address=03 Hex)

(MSB)

(LSB)

CRC7

CRC6

CRC5

CRC4

CRC3

CRC2

CRC1

CRC0

CRCCR2

CRC14

CRC13

CRC12

CRC11

CRC10

CRC9

CRC8

CRCCR1

SYMBOL

POSITION

NAME AND DESCRIPTION

CRC15

CRCCR1.7

MSB of the CRC4 error count.

CRC0

CRCCR2.0

LSB of the CRC4 error count.

CRC4 Count Register 1 (CRCCR1) is the most significant word and CRCCR2 is the least significant

word of a 16-bit counter that records word errors in the Cyclic Redundancy Check 4 (CRC4). Since the

maximum CRC4 count in a 1-second period is 1000, this counter cannot saturate. The counter is disabled

during loss of sync at either the FAS or CRC4 level; it will continue to count if loss of sync occurs at the

CAS level.

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