DS21FF42 Maxim Integrated Products, DS21FF42 Datasheet - Page 50

• Manufacturer Part Number: DS21FF42
• Description: IC FRAMER T1 4X4 16CH 300-BGA
• Manufacturer: Maxim Integrated Products

Specifications of DS21FF42

• Controller Type: T1 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

PCVCR1: PATH VIOLATION COUNT REGISTER 1 (Address = 25 Hex)
PCVCR2: PATH VIOLATION COUNT REGISTER 2 (Address = 26 Hex)
NOTES:
1. The upper nibble of the counter at address 25 is used by the Multiframes Out of Sync Count Register
2. PCVCR counts either errors in CRC code words (in the ESF framing mode; CCR2.3=1) or errors in
PATH CODE VIOLATION COUNTING ARRANGEMENTS Table 11-2
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 12-3 for a detailed description of what the MOSCR is capable of counting.
(note 1)
(MSB)
CRC/
FB7
the framing bit position (in the D4 framing mode; CCR2.3=0).
CRC/FB11
SYMBOL
CRC/FB0
FRAMING MODE
(CCR2.3)
(note 1)
CRC/
FB6
ESF
D4
D4
POSITION
PCVCR1.3
PCVCR2.0
(note 1)
CRC/
FB5
(note 1)
CRC/
FB4
COUNT Fs ERRORS?
NAME AND DESCRIPTION
MSB of the 12–Bit CRC6 Error or Frame Bit Error
Count (note #2)
LSB of the 12–Bit CRC6 Error or Frame Bit Error Count
(note #2)
(RCR2.1)
don’t care
CRC/
CRC/
FB11
FB3
yes
50 of 114
no
CRC/
CRC/
FB10
FB2
CRC/
CRC/
errors in the Ft pattern
errors in both the Ft & Fs
patterns
errors in the CRC6 code words
FB9
FB1
WHAT IS COUNTED
IN THE PCVCRs
(LSB)
CRC/
CRC/
FB8
FB0
PCVCR1
PCVCR2