參數(shù)資料
型號: DS21554LN
廠商: DALLAS SEMICONDUCTOR
元件分類: Digital Transmission Interface
英文描述: DATACOM, PCM TRANSCEIVER, PQFP100
封裝: 14 X 14 MM, LQFP-100
文件頁數(shù): 4/117頁
文件大?。?/td> 698K
代理商: DS21554LN
DS21354 & DS21554
101 of 117
DS21354/554 FRAMER SYNCHRONIZATION FLOWCHART Figure 19-14
FASResync
Criteria Met
Check for >=915
Out of 1000
CRC4WordErrors
8ms
Time
Out
RLOS= 1
Set FASRC
(RIR.1)
CASResync
CriteriaMet;
Set CASRC
(RIR.0)
FASSearch
FASSA=1
FASSync
Criteria Met
FASSA=0
CASSync
Criteria Met
CASSA= 0
If CRC4 is on
(CCR1.0 = 1)
RLOS=1
If CASis on
(CCR1.3 =0)
Power Up
Increment CRC4
Sync Counter;
CRC4SA= 0
CRC4 Resync
CriteriaMet
(RIR.2)
CASMultiframe Search
(if enabledviaCCR1.3)
CASSA= 1
CRC4 Multiframe Search
(if enabledviaCCR1.0)
CRC4SA= 1
Resyncif
RCR1.0 =0
Check for FAS
Framing Error
(depends on RCR1.2)
Check for CAS
MFWordError
Sync Declared
RLOS=0
CRC4 Sync Criteria
Met; CRC4SA= 0;
Reset CRC4
Sync Counter
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