DS21FF44 Maxim Integrated Products, DS21FF44 Datasheet - Page 45

• 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

RIR: RECEIVE INFORMATION REGISTER (Address = 08 Hex)
SSR: SYNCHRONIZER STATUS REGISTER (Address = 1E Hex)
CRC4 SYNC COUNTER
The CRC4 Sync Counter increments each time the 8ms CRC4 multiframe search times out. The counter
is cleared when the framer has successfully obtained synchronization at the CRC4 level. The counter can
also be cleared by disabling the CRC4 mode (CCR1.0=0). This counter is useful for determining the
amount of time the framer has been searching for synchronization at the CRC4 level. ITU G.706 suggests
(MSB)
(MSB)
CSC5
TESF
SYMBOL
SYMBOL
CRC4SA
CRCRC
CASRC
CASSA
FASRC
FASSA
LORC
TESE
RESF
RESE
CSC5
CSC4
CSC3
CSC2
CSC0
TESF
CSC4
TESE
POSITION
POSITION
SSR.7
SSR.6
SSR.5
SSR.4
SSR.3
SSR.2
SSR.1
SSR.0
RIR.7
RIR.6
RIR.5
RIR.4
RIR.3
RIR.2
RIR.1
RIR.0
LORC
CSC3
Transmit Side Elastic Store Full. Set when the transmit side
elastic store buffer fills and a frame is deleted.
Transmit Side Elastic Store Empty. Set when the transmit
side elastic store buffer empties and a frame is repeated.
Loss of Receive Clock. Set when the RCLK pin has not
transitioned for at least 2ms (3ms ± 1ms).
Receive Side Elastic Store Full. Set when the receive side
elastic store buffer fills and a frame is deleted.
Receive Side Elastic Store Empty. Set when the receive side
elastic store buffer empties and a frame is repeated.
CRC Resync Criteria Met. Set when 915/1000 code words
are received in error.
FAS Resync Criteria Met. Set when three consecutive FAS
words are received in error.
CAS Resync Criteria Met. Set when two consecutive CAS
MF alignment words are received in error.
CRC4 Sync Counter Bit 5. MSB of the 6-bit counter.
CRC4 Sync Counter Bit 4
CRC4 Sync Counter Bit 3
CRC4 Sync Counter Bit 2
CRC4 Sync Counter Bit 0. LSB of the 6-bit counter. The next
to LSB is not accessible.
FAS Sync Active. Set while the synchronizer is searching for
alignment at the FAS level.
CAS MF Sync Active. Set while the synchronizer is searching
for the CAS MF alignment word.
CRC4 MF Sync Active. Set while the synchronizer is
searching for the CRC4 MF alignment word.
RESF
CSC2
45 of 117
RESE
CSC0
NAME AND DESCRIPTION
NAME AND DESCRIPTION
CRCRC
FASSA
CASSA
FASRC
CRC4SA
CASRC
(LSB)
(LSB)