DS21455 Maxim Integrated Products, DS21455 Datasheet - Page 72

• Manufacturer Part Number: DS21455
• Description: Network Controller & Processor ICs Quad E1-T1-J1 Single -Chip Transceiver (S
• Manufacturer: Maxim Integrated Products

Specifications of DS21455

• Product: Framer
• Number Of Transceivers: 4
• Data Rate: 64 Kbps
• Supply Voltage (max): 3.465 V
• Supply Voltage (min): 3.135 V
• Supply Current (max): 328 mA
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Package / Case: BGA

Register Name:
Register Description:
Register Address:
Bit #
Name
Default
Bits 0 to 3/Chip Revision Bits (ID0 to ID3). The lower four bits of the IDR are used to display the die revision of the chip.
IDO is the LSB of a decimal code that represents the chip revision.
Bits 4 to 7/Device ID (ID4 to ID7). The upper four bits of the IDR are used to display the device ID. The device IDs for the
DS21458 and DS21455 are shown in the table below.
Register Name:
Register Description:
Register Address:
Bit #
Name
Default
Bit 0/Receive Loss of Sync Condition (RLOS). Set when the device is not synchronized to the received data stream.
Bit 1/Framer Receive Carrier Loss Condition (FRCL). Set when 255 (or 2048 if E1RCR2.0 = 1) E1 mode or 192 T1 mode
consecutive zeros have been detected at RPOSI and RNEGI.
Bit 2/Receive Unframed All Ones (T1, Blue Alarm, E1, AIS) Condition (RUA1). Set when an unframed all ones code is
received at RPOSI and RNEGI.
Bit 3/Receive Yellow Alarm Condition (RYEL) (T1 Only). Set when a yellow alarm is received at RPOSI and RNEGI.
Bit 4/Receive Loss of Sync Clear Event (RLOSC). Set when the framer achieves synchronization; will remain set until read.
Bit 5/Framer Receive Carrier Loss Clear Event (FRCLC). Set when carrier loss condition at RPOSI and RNEGI is no
longer detected.
Bit 6/Receive Unframed All Ones Clear Event (RUA1C). Set when the unframed all ones condition is no longer detected.
Bit 7/Receive Yellow Alarm Clear Event (RYELC) (T1 Only). Set when the yellow alarm condition is no longer detected.
RYELC
ID7
X
7
7
0
RUA1C
ID6
IDR
Device Identification Register
0Fh
SR2
Status Register 2
18h
X
6
6
0
DS21458
DS21455
FRCLC
Device
ID5
X
5
5
0
RLOSC
ID4
ID7
X
4
4
0
1
1
72 of 270
ID6
0
1
RYEL
ID3
X
3
3
0
ID5
0
0
RUA1
ID4
ID2
0
0
X
2
2
0
FRCL
ID1
X
1
1
0
RLOS
ID0
X
0
0
0