參數(shù)資料
型號(hào)： XRT7302
廠商： Exar Corporation
英文描述： 2 Channel E3/DS3/STS-1 Line Interface Unit(2通道 E3/DS3/STS-1線接口單元)
中文描述： 2頻道E3/DS3/STS-1線路接口單元（2通道E3/DS3/STS-1線接口單元）
文件頁(yè)數(shù)： 5/62頁(yè)
文件大小： 715K
代理商： XRT7302
á
2 CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
XRT7302
REV. 1.1.6
III
COMMAND REGISTER CR0-(N) ..................................................................................................... 39
COMMAND REGISTER CR2-(N) ..................................................................................................... 40
COMMAND REGISTER CR0-(N) ..................................................................................................... 40
COMMAND REGISTER CR2-(N) ..................................................................................................... 40
Muting the Recovered Data while the LOS is being Declared ........................................................... 40
COMMAND REGISTER CR3-(N) ..................................................................................................... 41
3.7 R
OUTING
THE
R
ECOVERED
T
IMING
AND
D
ATA
I
NFORMATION
TO
THE
R
ECEIVING
T
ERMINAL
E
QUIPMENT
.
41
Routing Dual-Rail Format Data to the Receiving Terminal Equipment ............................................. 41
Figure 22.The typical interface for the Transmission of Data in a Dual-Rail Format from the Receive Section of
the XRT7302 to the Receiving Terminal Equipment ........................................................................ 41
Figure 23.How the XRT7302 outputs data on the RPOS and RNEG output pins .......................................... 42
Figure 24.The Behavior of the RPOS, RNEG and RxClk signals when RxClk is inverted ............................. 42
COMMAND REGISTER CR3-(N) ..................................................................................................... 43
Routing Single-Rail Format (Binary Data Stream) data to the Receive Terminal Equipment ........... 43
COMMAND REGISTER CR3-(N) ..................................................................................................... 43
Figure 25.The typical interface for Data Transmission in a Single-Rail Format from the Receive Section of the
XRT7302 to the Receiving Terminal Equipment .............................................................................. 43
Figure 26.The behavior of the RPOS and RxClk output signals while the XRT7302 is transmitting Single-Rail
data to the Receiving Terminal Equipment ...................................................................................... 44
3.8 S
HUTTING
OFF
THE
R
ECEIVE
S
ECTION
.......................................................................................... 44
COMMAND REGISTER CR3-(N) ..................................................................................................... 44
4.0 DIAGNOSTIC FEATURES OF THE XRT7302 .................................................................................. 45
4.1 T
HE
A
NALOG
L
OCAL
L
OOP
-B
ACK
M
ODE
......................................................................................... 45
Figure 27. A channel in the XRT7302 operating in the Analog Local Loop-Back Mode ................................. 45
COMMAND REGISTER CR4-(N) ..................................................................................................... 45
4.2 T
HE
D
IGITAL
L
OCAL
L
OOP
-B
ACK
M
ODE
. ......................................................................................... 46
Figure 28.The Digital Local Loop-Back path in a given channel of the XRT7302 .......................................... 46
COMMAND REGISTER CR4-(N) ..................................................................................................... 46
4.3 T
HE
R
EMOTE
L
OOP
-B
ACK
M
ODE
................................................................................................... 47
Figure 29.The Remote Loop-Back path in a given XRT7302 Channel .......................................................... 47
COMMAND REGISTER CR4-(
n
) ..................................................................................................... 47
4.4 T
X
OFF F
EATURES
......................................................................................................................... 47
COMMAND REGISTER CR1-(N) ..................................................................................................... 48
Table 6:The Relationship Between the TxOFF Input Pin, the TxOFF Bit Field and the State of the Transmitter
48
4.5 T
HE
T
RANSMIT
D
RIVE
M
ONITOR
F
EATURES
.................................................................................... 48
Figure 30.The XRT7302 employing the Transmit Drive Monitor Features ..................................................... 49
4.6 T
HE
TAOS (T
RANSMIT
A
LL
O
NE
S) F
EATURE
................................................................................. 49
5.0 THE MICROPROCESSOR SERIAL INTERFACE ............................................................................ 49
5.1 D
ESCRIPTION
OF
THE
C
OMMAND
R
EGISTERS
.................................................................................. 49
COMMAND REGISTER CR1-(N) ..................................................................................................... 49
Table 7:Addresses and Bit Formats of XRT7302 Command Registers ......................................................... 50
5.2 D
ESCRIPTION
OF
B
IT
-F
IELDS
FOR
EACH
C
OMMAND
R
EGISTER
......................................................... 50
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