DS2282/87-22282-000 Maxim Integrated, DS2282/87-22282-000 Datasheet - Page 17

• 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

Loss Of Frame Count (LOFC): A count of the number
of times Loss Of Frame (LOF) has been declared. An
LOF is declared by the following method. Each super-
frame (3 ms) will be examined for a LOF event. If an
event is present, then an internal counter (which is not
available to the user) will be incremented by five, if no
event is present, then the counter will be decremented
by one. When the counter crosses a boundary of 4166
(2.5 sec x 333.3 SF/sec x 5 counts/SF) then a LOF will
be declared and the LOFC will be incremented by one.
At this point, the counter will be reset to zero when for at
least one full second, a LOF has not occured.
Bursty Errored Seconds (BES): A one–second period
with more than one but less than 320 CRC–6 error
events.
ESF Error Event: Each ESF is checked for either a
CRC–6 event or an OOF event.
INITIALIZING THE ADDRESS OF THE
SERIAL PORT
The serial port on the DS2282 can be assigned an ad-
dress from 0 to 30 decimal. Address location 31 decimal
will set the serial port into a mode where the Extra Bit is
not needed in the communications over the serial port
(see “Serial Port Operation”). The default address is 0
decimal. The DS2282 is shipped from the factory with
the default value in place. The address can be pro-
grammed in the following manner:
1. Power down the DS2282.
2. Set the Program Address Select pin to be pulled high
3. Configure the User Bits 1 to 5 with the desired ad-
4. Leave all other pins open.
5. Apply power to the DS2282 for at least 1 second.
6. Power down the DS2282.
7. Set the Program Address Select pin to remain low
At this point, the DS2282 will be programmed to the
proper value. Assigning a new address value can be
performed with the same procedure. The address value
is stored in nonvolatile memory.
when power is applied.
dress; UB1 is the LSB, UB5 is the MSB.
when power is reapplied.
NONVOLATILE STORAGE
The DS2282 can retain its onboard program and the
contents of the nonvolatile registers for at least ten
years in the absence of power at room temperature. If
power is applied to the DS2282 at least 50% of the time,
the nonvolatile storage will last at least 20 years.
SINGLE IN–LINE CONNECTOR
The DS2282 is designed to connect directly into a
30–position Single In–Line connector. These connec-
tors are available from a number of vendors.
LOOPBACK CONTROL REGISTER
The Loopback Control Register (LBCR) allows the user
to determine the action of the Payload Loopback (PLB)
and Line Loopback (LLB) pins. The user has the option
to either allow the DS2282 to respond normally to loop-
backs, as described in “Receive Unscheduled Message
Operation,” or to force the PLB or LLB pins high or low.
The default value for the LBCR is 00 hex. In addition, the
LCR allows the user to automatically interrupt the trans-
mission of the yellow alarm to either send a PRM
(T1.403) or a Response Message–RM (54016) by set-
ting the IYA bit. The yellow alarm interrupt routine trans-
mits 27 opening flags to insure synchronization by the
far end receiver prior to transmitting a PRM or RM.
Within the T1.403 mode, an Unscheduled Message
enabled by the TUMR register will override the trans-
mission of the interruptable yellow alarm. Also, the
LBCR allows a software method of disabling local slip
indications by setting the DS bit. This enables the
Enhanced Configuration Data Response (model #3) to
be sent in 54016 mode, when local slip indication is dis-
abled.
DS
IYA
(MSB)
0
DS
Disable Local SLIP Indications.
0 = follow the SLIP pin for SLIP indications
(this includes disabling slip counts by per-
manently tying the SLIP pin low)
1 = force the disabling of local slip indica-
tions regardless of the SLIP pin
Interruptable Yellow Alarm Enable.
0 = do not transmit an interruptable yellow
IYA
0
DLLB
FLLB
DPLB
022798 17/22
DS2282
FPLB
(LSB)