DS21Q43AT Maxim Integrated Products, DS21Q43AT Datasheet - Page 24

• Manufacturer Part Number: DS21Q43AT
• Description: IC FRAMER E1 QUAD 5V IND 128TQFP
• Manufacturer: Maxim Integrated Products

Specifications of DS21Q43AT

• Controller Type: E1 Framer
• Interface: Parallel/Serial
• Voltage - Supply: 4.5 V ~ 5.5 V
• Current - Supply: 32mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 128-TQFP, 128-VQFP
• Dc: 0319
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

SSR: SYNCHRONIZER STATUS REGISTER (Address=1E Hex)
CRC4 SYNC COUNTER
The CRC4 Sync Counter increments each time the 8 ms CRC4 multiframe search times out. The counter
is cleared when the DS21Q43A 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 DS21Q43A has been searching for synchronization at the CRC4 level. Annex B of
ITU G.706 suggests that if synchronization at the CRC4 level cannot be obtained within 400 ms, then the
search should be abandoned and proper action taken. The CRC4 Sync Counter will rollover.
(MSB)
CSC5
SYMBOL
CRC4SA
CASSA
FASSA
CSC5
CSC4
CSC3
CSC2
CSC0
CSC4
POSITION
SSR.7
SSR.6
SSR.5
SSR.4
SSR.3
SSR.2
SSR.1
SSR.0
CSC3
NAME AND DESCRIPTION
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.
CSC2
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CSC0
FASSA
CASSA
CRC4SA
DS21Q43A
(LSB)