DS2143 datasheet(21/44 Pages) DALLAS

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DS2143/DS2143Q

21 of 44

IMR2: INTERRUPT MASK REGISTER 2 (Address=17 Hex)

(MSB)

(LSB)

RMF

RAF

TMF

SEC

TAF

LOTC

RCMF

LORC

SYMBOL

POSITION

NAME AND DESCRIPTION

RMF

IMR2.7

Receive CAS Multiframe.

0 = interrupt masked.

1 = interrupt enabled.

RAF

IMR2.6

Receive Align Frame.

0 = interrupt masked.

1 = interrupt enabled.

TMF

IMR2.5

Transmit Multiframe.

0 = interrupt masked.

1 = interrupt enabled.

SEC

IMR2.4

1-Second Timer.

0 = interrupt masked.

1 = interrupt enabled.

TAF

IMR2.3

Transmit Align Frame.

0 = interrupt masked.

1 = interrupt enabled.

LOTC

IMR2.2

Loss Of Transmit Clock.

0 = interrupt masked.

1 = interrupt enabled.

RCMF

IMR2.1

Receive CRC4 Multiframe.

0 = interrupt masked.

1 = interrupt enabled.

LORC

IMR2.0

Loss of Receive Clock.

0 = interrupt masked.

1 = interrupt enabled.

5.0 ERROR COUNT REGISTERS

There are a set of three counters in the DS2143 that record bipolar violations, errors in the CRC4 SMF

code words, and E-bits as reported by the far end. Each of these three counters are automatically updated

on 1-second boundaries as determined by the 1-second timer in Status Register 2 (SR2.4). Hence, these

registers contain performance data from the previous second. The user can use the interrupt from the 1-

second timer to determine when to read these registers. The user has a full second to read the counters

before the data is lost.

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