DS2196 datasheet(57/157 Pages) DALLAS

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DS2196

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Table 7-1: RECEIVE T1 LEVEL INDICATION

RL1

RL0

TYPICAL LEVEL RECEIVED

+2 dB to –7.5 dB

–7.5 dB to –15 dB

–15 dB to –22.5 dB

less than –22.5 dB

NOTE:

The RAIS-CI bit is qualified with the RBL status bit (SR1A.3 and SR1B.3). Hence the RAIS-CI status

bit will not be set unless the RBL status bit is set. If the RBL bit is set and the RAIS-CI bit has

transitioned from a 1 to a 0 (i.e., it has cleared), it is recommended that the software wait at lest 1.5

seconds and then read the RAIS-CI bit again to make sure that the alarm has indeed cleared.

SR1A: STATUS REGISTER 1 FRAMER A (Address = 20 Hex)

(MSB)

(LSB)

LUP

LDN

LOTC

LSPARE

RBL

RYEL

FRCL

RLOS

SYMBOL

POSITION

NAME AND DESCRIPTION

LUP

SR1A.7

Loop Up Code Detected. Set when the loop up code as

defined in the RUPCD register is being received. See Section

12 for details.

LDN

SR1A.6

Loop Down Code Detected. Set when the loop down code as

defined in the RDNCD register is being received. See Section

12 for details.

LOTC

SR1A.5

Loss of Transmit Clock. Set when the TCLKA pin has not

transitioned for one channel time (or 5.2

ms). Will force the

RLOSA/LOTCA pin high if enabled via CCR1A.6. Also will

force transmit side formatter to switch to MCLK if so enabled

via TCR1A.7.

LSPARE

SR1A.4

Spare Code Detected. Set when the spare code as defined in

the RSPARE register is being received. See Section 12 for

details.

RBL

SR1A.3

Receive Blue Alarm. Set when an unframed all 1’s code is

received at RPOSIA and RNEGIA.

RYEL

SR1A.2

Receive Yellow Alarm. Set when a yellow alarm is received

at RPOSIA and RNEGIA.

FRCL

SR1A.1

Framer Receive Carrier Loss. Set when a red alarm is

received at RPOSIA and RNEGIA.

RLOS

SR1A.0

Receive Loss of Sync. Set when the device is not

synchronized to the receive T1 stream.

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