參數(shù)資料
型號(hào): DS21FF42N
廠商: DALLAS SEMICONDUCTOR
元件分類: Digital Transmission Controller
英文描述: DATACOM, FRAMER, PBGA300
封裝: 27 X 27 MM, BGA-300
文件頁數(shù): 63/115頁
文件大?。?/td> 534K
代理商: DS21FF42N
DS21FF42/DS21FT42
51 of 115
PCVCR1: PATH VIOLATION COUNT REGISTER 1 (Address = 25 Hex)
PCVCR2: PATH VIOLATION COUNT REGISTER 2 (Address = 26 Hex)
(MSB)
(LSB)
(note 1)
CRC/
FB11
CRC/
FB10
CRC/
FB9
CRC/
FB8
PCVCR1
CRC/
FB7
CRC/
FB6
CRC/
FB5
CRC/
FB4
CRC/
FB3
CRC/
FB2
CRC/
FB1
CRC/
FB0
PCVCR2
SYMBOL
POSITION
NAME AND DESCRIPTION
CRC/FB11
PCVCR1.3
MSB of the 12–Bit CRC6 Error or Frame Bit Error
Count (note #2)
CRC/FB0
PCVCR2.0
LSB of the 12–Bit CRC6 Error or Frame Bit Error Count
(note #2)
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
the framing bit position (in the D4 framing mode; CCR2.3=0).
PATH CODE VIOLATION COUNTING ARRANGEMENTS Table 12-2
FRAMING MODE
(CCR2.3)
COUNT Fs ERRORS?
(RCR2.1)
WHAT IS COUNTED
IN THE PCVCRs
D4
no
errors in the Ft pattern
D4
yes
errors in both the Ft & Fs
patterns
ESF
don’t care
errors in the CRC6 code words
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.
相關(guān)PDF資料
PDF描述
DS21FT44N DATACOM, FRAMER, PBGA300
DS21FT44 DATACOM, FRAMER, PBGA300
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