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DS2282

T1 FDL Controller/Monitor Stik

Dallas Semiconductor -> Maxim Integrated 

DS2282

NAME

ADDR2,3 R/W CLEARABLE DESCRIPTION

TUMR

19

W

No

Transmit Unscheduled Message Register. An 8–bit

register that is used to send unscheduled messages.

PRMESR1

1C

R

Yes

PRM Errored Second Register. A 16–bit register that

counts ES as reported in the PRM.

PRMSESR1

1D

R

Yes

PRM Severely Errored Second Register. A 16–bit reg-

ister that counts SES as reported in the PRM.

PRMER1

1E

R

Yes

PRM Error Register. An 8–bit register that counts PRMs

that are received in error.

PAR1

1F

W

No

PRM Address Register. An 8–bit register determines the

action of the PRM opening address.

NOTES:

1. Register is nonvolatile.

2. Values indicated in hexadecimal format.

3. All registers read/written LSB first.

STATUS REGISTER (04)

The Status Register (SR) reports alarms and events.

The SR is always cleared when it is read by an external

controller, hence the Clear Bit in the Register Byte does

not need to be set. All of the bits in the SR operate in a

“latched” fashion. That is, once an event or alarm has

occurred, the appropriate bit in the SR will remain set

until the SR is read. All of the bits in the SR will be

cleared when read unless the alarm condition still

exists. Also, except for the B8ZSD bit, the INT pin will be

asserted (transitions low), indicating to an external con-

troller that a bit in the SR has changed status. The INT

pin will return high as soon as the status register is ac-

cessed.

SR: Status Register (04)

(MSB)

PLB LLB

(LSB)

16ZD RCL RYEL RLOS B8ZSD AIS

PLB

LLB

16ZD

RCL

Payload Loopback. Set when payload

loopback is active.

Line Loopback. Set when line loopback

is active. Will not go active in 54016 envi-

ronments.

Sixteen Zero Detect. Set when 16 con-

secutive zeros are received. An indica-

tion of a pulse density violation.

Receive Carrier Loss. Set when 192 con-

secutive zeros have been received.

RYEL

RLOS

B8ZSD

AIS

Receive Yellow Alarm. Set when 16 con-

secutive 00FF Hex codes have been re-

ceived in the FDL.

Receive Loss of Sync. Set when the

DS2282 loses synchronization.

B8ZS Detect. Set when a B8ZS code

word is received; operates whether the

DS2282 is set up for B8ZS or not. Does

not affect INT.

Alarm Indication Signal. Set when an un-

framed all one’s signal is received.

SOFTWARE VERSION REGISTER

The software version register (SWVR) (3F) allows the

user to display software version information. When

accessed, the DS2282 software revision will be

returned by the serial port. For example, the serial port

will return 0Bh for software version V11.

SOFTWARE LEVEL REGISTER

The software level register (SWLR) (3E) allows the user

to display software version level information. When

accessed, the two’s complement of the DS2282 soft-

ware revision level will be returned by the serial port. If

the returned value is negative, the software revision

level is in “beta” or prototype state. If positive, the soft-

ware revision level is the production release. For exam-

ple, the serial port will return 05h for production software

version level V11.5 (FBh for “beta” release).

022798 9/22

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