Datasheet

DS21348/DS21Q348

39 of 76

RIR1 (08H): RECEIVE INFORMATION REGISTER 1

(MSB)

(LSB)

ZD 16ZD HBD RCLC RUA1C JALT n/a n/a

SYMBOL POSITION DESCRIPTION

(latched)

RIR1.7 Zero Detect. Set when a string of at least four (ETS = 0) or eight

(ETS = 1) consecutive zeros (regardless of the length of the string)

have been received. Will be cleared when read.

16ZD

(latched)

RIR1.6 Sixteen Zero Detect. Set when at least 16 consecutive zeros

(regardless of the length of the string) have been received. Will be

cleared when read.

HBD

(latched)

RIR1.5 HDB3/B8ZS Word Detect. Set when an HDB3 (ETS = 0) or B8ZS

(ETS = 1) code word is detected independent of whether the receive

HDB3/B8ZS mode (CCR4.6) is enabled. Will be cleared when read.

Useful for automatically setting the line coding.

RCLC

(latched)

RIR1.4 Receive Carrier Loss Clear. Set when the RCL alarm has met the

clear criteria defined in Table 5-1. Will be cleared when read.

RUA1C

(latched)

RIR1.3 Receive Unframed All Ones Clear. Set when the unframed all ones

signal is no longer detected. Will be cleared when read (Table 5-1).

JALT

(latched)

RIR1.2 Jitter Attenuator Limit Trip. Set when the jitter attenuator FIFO

reaches to within 4 bits of its useful limit. Will be cleared when read.

Useful for debugging jitter attenuation operation.

N/A RIR1.1 Not Assigned. Could be any value when read.

N/A RIR1.0 Not Assigned. Could be any value when read.