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)： 53/62頁(yè)
文件大?。?/td> 715K
代理商： XRT7302
á
PRELIMINARY
2 CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
XRT7302
REV. P1.1.6
49
When the Transmit Drive Monitor circuitry in a given
line is connected to the line as illustrated in Figure 30,
then it monitors the line for transitions. As long as the
Transmit Drive Monitor circuitry detects transitions on
the line via the MTIP(n) and MRing(n) pins, it keeps
the DMO (Drive Monitor Output) signal "Low". How-
ever, if the Transmit Drive Monitor circuit detects no
transitions on the line for 128+32 TxClk periods, the
DMO (Drive Monitor Output) signal toggles "High".
N
OTE
:
The Transmit Drive Monitor circuit does not have to
be used to operate the Transmit Section of the XRT7302.
This is purely a diagnostic feature.
4.6
T
HE
TAOS (T
RANSMIT
A
LL
O
NE
S) F
EATURE
The XRT7302 can command any channel to transmit
an all “1’s” pattern onto the line by toggling a single
input pin or by setting a single bit-field in one of the
Command Registers to "1".
N
OTE
:
When this feature is activated, the Transmit Section
of the configured channel in the XRT7302 overwrites the
Terminal Equipment data with an all “1’s” pattern.
a. Operating in the Hardware Mode
Configure Channel(n) to transmit an all “1’s” pattern
by toggling the TAOS(n) input pin “High". Terminate
the all “1’s” pattern by toggling the TAOS(n) input pin
"Low".
b. Operating in the HOST Mode
Configure Channel(n) to transmit an all “1’s” pattern
by writing to Command Register CR1-(n) and setting
the TAOS(n) bit-field (D3) to "1".
COMMAND REGISTER CR1-(N)
Terminate the all “1’s” pattern by writing to Command
Register CR1-(n) and setting the TAOS(n) bit-field
(D3) to "0".
5.0
THE MICROPROCESSOR SERIAL INTER-
FACE
The on-chip Command Registers of XRT7302 DS3/
E3/STS-1 Line Interface Unit IC are used to configure
the XRT7302 into a wide-variety of modes. This sec-
tion discusses the following:
1. The description of the Command Registers.
2. A description on how to use the Microprocessor
Serial Interface.
5.1
D
ESCRIPTION
OF
THE
C
OMMAND
R
EGISTERS
Table 7 lists the Command Registers, their Addresses
and their bit-formats.
F
IGURE
30. T
HE
XRT7302
EMPLOYING
THE
T
RANSMIT
D
RIVE
M
ONITOR
F
EATURES
R1 = 31.6
R2 = 31.6
Channel (n)
TxPOS(n)
TxNEG(n)
TxLineClk(n)
TTIP(n)
TRing(n)
TPData(n)
TNData(n)
TxClk(n)
Only One Channel Shown
1:1
J1
BNC
MTIP(n)
MRing(n)
R3 = 270
R4 = 270
D4
D3
D2
D1
D0
TxOFF(n)
TAOS(n)
TxClkINV(n)
TxLEV(n) TxBIN(n)
0
1
X
X
X
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