DS2152 datasheet(31/94 Pages) DALLAS

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DS2152

31 of 93

RIR1: RECEIVE INFORMATION REGISTER 1 (Address=22 Hex)

(MSB)

(LSB)

COFA

8ZD

16ZD

RESF

RESE

SEFE

B8ZS

FBE

SYMBOL

POSITION

NAME AND DESCRIPTION

COFA

RIR1.7

Change of Frame Alignment. Set when the last resync resulted

in a change of frame or multiframe alignment.

8ZD

RIR1.6

Eight-0 Detect. Set when a string of at least eight consecutive 0s

(regardless of the length of the string) have been received at

RPOSI and RNEGI.

16ZD

RIR1.5

Sixteen-0 Detect. Set when a string of at least 16 consecutive 0s

(regardless of the length of the string) have been received at

RPOSI and RNEGI.

RESF

RIR1.4

Receive Elastic Store Full. Set when the receive elastic store

buffer fills and a frame is deleted.

RESE

RIR1.3

Receive Elastic Store Empty. Set when the receive elastic store

buffer empties and a frame is repeated.

SEFE

RIR1.2

Severely Errored Framing Event. Set when 2 out of 6 framing

bits (Ft or FPS) are received in error.

B8ZS

RIR1.1

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

detected at RPOS and RNEG independent of whether the B8ZS

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

setting the line coding.

FBE

RIR1.0

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

is received in error.

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