參數(shù)資料
型號: XRT75R12DIB-L
廠商: Exar Corporation
文件頁數(shù): 58/133頁
文件大?。?/td> 0K
描述: IC LIU E3/DS3/STS-1 12CH 420TBGA
標(biāo)準(zhǔn)包裝: 40
類型: 線路接口裝置(LIU)
驅(qū)動器/接收器數(shù): 12/12
規(guī)程: DS3,E3,STS-1
電源電壓: 3.135 V ~ 3.465 V
安裝類型: 表面貼裝
封裝/外殼: 420-LBGA 裸露焊盤
供應(yīng)商設(shè)備封裝: 420-TBGA(35x35)
包裝: 托盤
XRT75R12D
26
TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
REV. 1.0.3
3.5.5
Muting the Recovered Data with LOS condition:
When the LOS condition is declared, the clock recovery circuit locks into the reference clock applied to the
internal master clock outputs this clock onto the RxClk_n output pin. The data on the RxPOS_n and RxNEG_n
pins can be forced to zero by setting the LOSMUT_n bits in the individual channel control register to “1”.
NOTE: When the LOS condition is cleared, the recovered data is output on RxPOS_n and RxNEG_n pins.
3.6
B3ZS/HDB3 Decoder
The decoder block takes the output from the clock and data recovery block and decodes the B3ZS (for DS3 or
STS-1) or HDB3 (for E3) encoded line signal and detects any coding errors or excessive zeros in the data
stream.
Whenever the input signal violates the B3ZS or HDB3 coding sequence for bipolar violation or
contains three (for B3ZS) or four (for HDB3) or more consecutive zeros, an active “High” pulse is generated on
the RLCV_n output pins to indicate line code violation.
FIGURE 12. RECEIVER DATA OUTPUT AND CODE VIOLATION TIMING
SYMBOL
PARAMETER
MIN
TYP
MAX
UNITS
RxClk
Duty Cycle
45
50
55
%
RxClk Frequency
E3
DS-3
STS-1
34.368
44.736
51.84
MHz
tRRX
RxClk rise time (10% o 90%)
2
4
ns
tFRX
RxClk falling time (10% to 90%)
2
4
ns
tCO
RxClk to RPOS/RNEG delay time
4
ns
tLCVO
RxClk to rising edge of LCV output delay
2.5
ns
RxClk
t
RRX
t
FRX
RPOS or
RNEG
LCV
t
LCVO
t
CO
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