DS21FF44 Maxim Integrated Products, DS21FF44 Datasheet - Page 46

• Manufacturer Part Number: DS21FF44
• Description: IC FRAMER E1 4X4 16CH 300-BGA
• Manufacturer: Maxim Integrated Products

Specifications of DS21FF44

• Controller Type: E1 Framer
• Interface: Parallel/Serial
• Voltage - Supply: 2.97 V ~ 3.63 V
• Current - Supply: 300mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 300-BGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

that if synchronization at the CRC4 level cannot be obtained within 400ms, then the search should be
abandoned and proper action taken. The CRC4 Sync Counter rolls over.
SR1: STATUS REGISTER 1 (Address = 06 Hex)
(MSB)
RSA1
SYMBOL
RDMA
RSLIP
RUA1
RLOS
RSA1
RSA0
RRA
RCL
RDMA
POSITION
SR1.4
SR1.7
SR1.6
SR1.5
SR1.3
SR1.2
SR1.1
SR1.0
RSA0
Receive Signaling All Ones/Signaling Change. Set when
over a full MF, the content of timeslot 16 contains fewer than
three zeros. This alarm is not disabled in the CCS signaling
mode. A change in the contents of RS1 through RS16 from
one multiframe to the next will cause RSA1 and RSA0 to be
set.
Receive Distant MF Alarm. Set when bit 6 of timeslot 16 in
frame 0 has been set for two consecutive multiframes. This
alarm is not disabled in the CCS signaling mode.
Receive Signaling All Zeros/Signaling Change. Set when
over a full MF, timeslot 16 contains all zeros. A change in the
contents of RS1 through RS16 from one multiframe to the next
will cause RSA1 and RSA0 to be set.
Receive Side Elastic Store Slip. Set when the elastic store has
either repeated or deleted a frame of data.
Receive Unframed All Ones. Set when an unframed all ones
code is received at RPOS and RNEG.
Receive Remote Alarm. Set when a remote alarm is received
at RPOS and RNEG.
Receive Carrier Loss. Set when 255 (or 2048 if CCR3.0 = 1)
consecutive zeros have been detected at RPOS and RNEG.
Receive Loss of Sync. Set when the device is not
synchronized to the receive E1 stream.
RSLIP
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RUA1
NAME AND DESCRIPTION
RRA
RCL
(LSB)
RLOS