DS21Q42T+ Maxim Integrated Products, DS21Q42T+ Datasheet - Page 47

• Manufacturer Part Number: DS21Q42T+
• Description: IC FRAMER ENHANCED T1 4X 128TQFP
• Manufacturer: Maxim Integrated Products

Specifications of DS21Q42T+

• Controller Type: T1 Framer
• Interface: Parallel/Serial
• Voltage - Supply: 2.97 V ~ 3.63 V
• Current - Supply: 75mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 128-TQFP, 128-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

MULTIFRAMES OUT OF SYNC COUNT REGISTER (MOSCR)
Normally the MOSCR is used to count the number of multiframes that the receive synchronizer is out of
sync (RCR2.0=1). This number is useful in ESF applications needing to measure the parameters Loss Of
Frame Count (LOFC) and ESF Error Events as described in AT&T publication TR54016. When the
MOSCR is operated in this mode, it is not disabled during receive loss of synchronization (RLOS=1)
conditions. The MOSCR has alternate operating mode whereby it will count either errors in the Ft
framing pattern (in the D4 mode) or errors in the FPS framing pattern (in the ESF mode). When the
MOSCR is operated in this mode, it is disabled during receive loss of synchronization (RLOS = 1)
conditions.
See Table 8-3 for a detailed description of what the MOSCR is capable of counting.
MOSCR1: MULTIFRAMES OUT OF SYNC COUNT REGISTER 1
(Address = 25 Hex)
MOSCR2: MULTIFRAMES OUT OF SYNC COUNT REGISTER 2
(Address = 27 Hex)
NOTES:
1) The lower nibble of the counter at address 25 is used by the Path Code Violation Count Register.
2) MOSCR counts either errors in framing bit position (RCR2.0 = 0) or the number of multiframes out
(MSB)
MOS/
MOS/
FB11
FB7
MOS/FB11
of sync (RCR2.0 = 1).
SYMBOL
MOS/FB0
MOS/
MOS/
FB10
FB6
POSITION
MOSCR1.7
MOSCR2.0
MOS/
MOS/
FB9
FB5
MOS/
MOS/
FB8
FB4
NAME AND DESCRIPTION
MSB of the 12–Bit Multiframes Out of Sync or F–Bit Error
Count (note #2)
LSB of the 12–Bit Multiframes Out of Sync or F–Bit Error
Count (note #2)
(note 1)
MOS/
FB3
47 of 116
(note 1)
MOS/
FB2
(note 1)
MOS/
FB1
(note 1)
MOS/
FB0
MOSCR
MOSCR
(LSB)
1
2