DS2282/87-22282-000 Maxim Integrated, DS2282/87-22282-000 Datasheet - Page 9

• Manufacturer Part Number: DS2282/87-22282-000
• Description: Network Controller & Processor ICs
• Manufacturer: Maxim Integrated

Specifications of DS2282/87-22282-000

• Supply Current (max): 30 mA
• Maximum Operating Temperature: + 70 C
• Mounting Style: Through Hole
• Package / Case: SIL-30
• Minimum Operating Temperature: 0 C
• Operating Supply Voltage: 5 V
• Part # Aliases: 90-22820-000

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)
PLB
LLB
16ZD
RCL
NAME
TUMR
PRMESR
PRMSESR
PRMER
PAR
(MSB)
PLB
1
LLB
1
1
1
16ZD
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.
ADDR
1C
1D
1E
19
1F
RCL
2,3
RYEL
R/W
W
W
R
R
R
RLOS
CLEARABLE
B8ZSD
Yes
Yes
Yes
No
No
AIS
(LSB)
DESCRIPTION
Transmit Unscheduled Message Register. An 8–bit
register that is used to send unscheduled messages.
PRM Errored Second Register. A 16–bit register that
counts ES as reported in the PRM.
PRM Severely Errored Second Register. A 16–bit reg-
ister that counts SES as reported in the PRM.
PRM Error Register. An 8–bit register that counts PRMs
that are received in error.
PRM Address Register. An 8–bit register determines the
action of the PRM opening address.
RYEL
RLOS
B8ZSD
AIS
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).
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.
022798 9/22
DS2282