參數(shù)資料
型號: XRT73LC03AIV
廠商: EXAR CORP
元件分類: 數(shù)字傳輸電路
英文描述: 3 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
中文描述: DATACOM, PCM TRANSCEIVER, PQFP120
封裝: 14 X 20 MM, LQFP-120
文件頁數(shù): 45/61頁
文件大?。?/td> 720K
代理商: XRT73LC03AIV
XRT73LC03A
3 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
REV. 1.0.1
43
forced to "0". Once the LOS condition has been
cleared, then the channel(n) resumes normal trans-
mission of the recovered data to the Receiving Termi-
nal.
This feature is available whenever XRT73LC03A is
operating in the HOST Mode or Hardware Mode.
a. Operating in the Hardware Mode.
The Muting upon LOS feature is enabled by pulling
the LOSMUTEN output pin “High". This enables the
Muting upon LOS feature globally for all channels.
b. Operating in the HOST Mode.
The Muting upon LOS feature for each Channel can
be enabled by writing a "1" into the LOSMUT_(n) bit-
field within Command Register 3.
COMMAND REGISTER CR3-(n)
N
OTE
:
This step only enables the Muting upon LOS feature
within Channel(n).
3.6
R
OUTING
THE
R
ECOVERED
T
IMING
AND
D
ATA
I
NFORMATION
TO
THE
R
ECEIVING
T
ERMINAL
E
QUIPMENT
Each channel takes the Recovered Timing and Data
information, converts it into CMOS levels and routes it
to the Receiving Terminal Equipment via the
RPOS_(n), RNEG_(n) and RxClk_(n) output pins.
Each channel can deliver the recovered data and
clock information to the Receiving Terminal in either a
Single-Rail or Dual-Rail format.
3.6.1
Receiving Terminal Equipment
Whenever a channel delivers Dual-Rail format to the
Terminal Equipment, it does so via the following sig-
nals.
RPOS_(n)
RNEG_(n)
RxClk_(n)
Figure 28 illustrates the typical interface for the trans-
mission of data in a Dual-Rail Format from the Re-
ceive Section of a channel to the Receiving Terminal
Equipment.
Routing Dual-Rail Format Data to the
.
The manner that a given channel transmits Dual-Rail
data to the Receiving Terminal Equipment is de-
scribed below and illustrated in Figure 29. Each
D4
D3
D2
D1
D0
(SR/DR)_(n)
LOSMUT_(n)
RxOFF_(n)
RxClk_(n)INV
Reserved
X
1
x
x
x
F
IGURE
28. T
HE
TYPICAL
INTERFACE
FOR
THE
T
RANSMISSION
OF
D
ATA
IN
A
D
UAL
-R
AIL
F
ORMAT
,
FROM
THE
R
ECEIVE
S
ECTION
OF
THE
XRT73LC03A
TO
THE
R
ECEIVING
T
ERMINAL
E
QUIPMENT
Terminal
Equipment
(E3/DS3 or STS-1
Framer)
Exar E3/DS3/STS-1 LIU
Receive
Logic
Block
RxPOS
RxNEG
RxClk
RPOS
RNEG
RxClk
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