DS2143 Maxim Integrated Products, DS2143 Datasheet - Page 16

• Manufacturer Part Number: DS2143
• Description: IC CONTROLLER E1 5V LP 40-DIP
• Manufacturer: Maxim Integrated Products

Specifications of DS2143

• Controller Type: E1 Controller
• Interface: Parallel/Serial
• Voltage - Supply: 4.5 V ~ 5.5 V
• Current - Supply: 10mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Through Hole
• Package / Case: 40-DIP (0.600", 15.24mm)
• 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 8ms CRC4 multiframe search times out. The counter
is cleared when the DS2143 has successfully obtained synchronization at the CRC4 level. The counter
can also be cleared by disabling the CRC4 mode (CCR.0=0). This counter is useful for determining the
amount of time the DS2143 has been searching for synchronization at the CRC4 level. Annex B of
CCITT 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
CSC1
CSC4
POSITION
SSR.2
SSR.1
SSR.7
SSR.6
SSR.5
SSR.4
SSR.3
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
16 of 44
CSC0
FASSA
CASSA
DS2143/DS2143Q
CRC4SA
(LSB)