參數(shù)資料
型號(hào)： XRT7300IV
廠商： EXAR CORP
元件分類： 數(shù)字傳輸電路
英文描述： E3/DS3/STS-1 LINE INTERFACE UNIT
中文描述： DATACOM, PCM TRANSCEIVER, PQFP44
封裝： 10 X 10 MM, 1.40 MM HEIGHT, TQFP-44
文件頁(yè)數(shù)： 44/55頁(yè)
文件大?。?/td> 608K
代理商： XRT7300IV
XRT7300
E3/DS3/STS-1 LINE INTERFACE UNIT
REV. 1.1.1
á
40
4.4
The XRT7300 allows the Transmit Driver in the Trans-
mit Section of the chip to be shut off. This feature can
be advantageous for system redundancy conditions
or during diagnostic testing. This feature can be acti-
vated by either of the following ways.
When the XRT7300 is operating in the Hardware
Mode
Shut off the Transmit Driver by toggling the TXOFF in-
put pin (pin 35) “High”. Turn on the Transmit Driver by
toggling the TXOFF input pin “Low”.
When the XRT7300 is operating in the HOST
Mode
If the XRT7300 is operating in the HOST Mode, the
TXOFF input pin is disabled. Consequently, the-
Transmit Driver is turned off by writing to Command
Register CR1 and setting the TXOFF bit-field (bit D4)
to “1”.
TXOFF F
EATURES
N
OTE
:
If the Transmitter is shut off via the TXOFF feature,
the XRT7300 can NOT be configured to operate in the Ana-
log Local Loop-Back Mode. To perform diagnostics on the
chip and still invoke the TXOFF feature as in System
Redundancy Applications, use the Digital Local Loop-Back
feature instead.
4.5
T
HE
T
RANSMIT
D
RIVE
M
ONITOR
F
EATURES
The Transmit Drive Monitor feature performs monitor-
ing of the line in the Transmit Direction for the occur-
rence of fault conditions such as a short circuit on the
line or a defective Transmit Drive in the XRT7300.
The Transmit Drive Monitor is activated by connecting
the MTIP pin (pin 44) to the TTIP line through a 270
resistor connected in series and by connecting the
MRING pin (pin 43) to the TRING line through a 270
resistor connected in series, as illustrated in
Figure 31.
When the Transmit Drive Monitor circuitry is connect-
ed to the line as illustrated in Figure 26, then it moni-
tors the line for transitions. As long as the Transmit
Drive Monitor circuitry detects transitions on the line
via the MTIP and MRING pins, it keeps the DMO
(Drive Monitor Output) signal “Low”. However, if the
Transmit Drive Monitor circuit detects no transitions
on the line for 128±32 TCLK periods, then the DMO
signal toggles “High”.
N
OTES
:
1. The Transmit Drive Monitor circuit does not have to
be used to operate the Transmit Section of the
XRT7300. This is purely a diagnostic feature.
COMMAND REGISTER CR1 (ADDRESS = 0X01)
D4
D3
D2
D1
D0
TXOFF
TAOS
TXCLKINV
TXLEV
TXBIN
1
X
X
X
X
F
IGURE
31. T
HE
XRT7300 E
MPLOYING
THE
T
RANSMIT
D
RIVE
M
ONITOR
F
EATURES
R1 = 36
R2 = 36
TTIP
TRING
1:1
MTIP
MRING
R3 = 270
R4 = 270
T1
R5 = 75
相關(guān)PDF資料
PDF描述
XRT7300 E3/DS3/STS-1 LINE INTERFACE UNIT
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XRT73L02M TWO CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
XRT73L02MIV TWO CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
XRT73L02 2 Channel E3/DS3/STS-1 Line Interface Unit(2通道 E3/DS3/STS-1線接口單元)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
XRT7300IV-F 功能描述:外圍驅(qū)動(dòng)器與原件 - PCI RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray
XRT7300IVTR 功能描述:網(wǎng)絡(luò)控制器與處理器 IC RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
XRT7300IVTR-F 功能描述:網(wǎng)絡(luò)控制器與處理器 IC RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
XRT7302IV 制造商:未知廠家 制造商全稱:未知廠家 功能描述:PCM Transceiver
XRT73L00 制造商:EXAR 制造商全稱:EXAR 功能描述:E3/DS3/STS-1 LINE INTERFACE UNIT
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