DS2196 datasheet(53/157 Pages) DALLAS

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DS2196

53 of 157

RIR1A: RECEIVE INFORMATION REGISTER 1 FRAMER A (Address = 22

Hex)

(MSB)

(LSB)

COFA

8ZD

16ZD

–

SEFE

B8ZS

FBE

SYMBOL

POSITION

NAME AND DESCRIPTION

COFA

RIR1A.7

Change of Frame Alignment. Set when the last resync

resulted in a change of frame or multiframe alignment.

8ZD

RIR1A.6

Eight Zero Detect. Set when a string of at least eight

consecutive zeros (regardless of the length of the string) have

been received at RPOSIA and RNEGIA.

16ZD

RIR1A.5

Sixteen Zero Detect. Set when a string of at least sixteen

consecutive zeros (regardless of the length of the string) have

been received at RPOSIA and RNEGIA.

–

RIR1A.4

Not Assigned. Could be any value when read.

–

RIR1A.3

Not Assigned. Could be any value when read.

SEFE

RIR1A.2

Severely Errored Framing Event. Set when 2 out of 6

framing bits (Ft or FPS) are received in error.

B8ZS

RIR1A.1

B8ZS Code Word Detect. Set when a B8ZS code word is

detected at RPOSIA and RNEGIA independent of whether the

B8ZS mode is selected or not via CCR2.6. Useful for

automatically setting the line coding.

FBE

RIR1A.0

Frame Bit Error. Set when a Ft (D4) or FPS (ESF) framing

bit is received in error.

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