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參數(shù)資料
| 型號： | XRT72L74 |
| 廠商： | Exar Corporation |
| 元件分類： | 通信及網(wǎng)絡 |
| 英文描述： | Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0 |
| 中文描述： | Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0 |
| 文件頁數(shù)： | 18/104頁 |
| 文件大?。?/td> | 1301K |
| 代理商： | XRT72L74 |
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XRT72L74
FOUR CHANNEL, DS3 ATM UNI/CLEAR-CHANNEL FRAMER
REV. P1.0.0
á
PRELIMINARY
18
D20
B19
A19
C18
Req_0
Req_1
Req_2
Req_3
O
Receive Equalization Bypass Control Output Pin—(to be connected to the
XRT73L04 E3/DS3/STS-1 LIU IC):
This output pin is intended to be connected to the Req input pin of the XRT73L04 E3/
DS3/STS-1 LIU IC. The user can control the state of this output pin by writing a ‘0’
or ‘1’ to Bit 5 (Req) of the Line Interface Driver Register (Address = 0x72). If the
user commands this signal to toggle “High” then it will cause the incoming DS3 line
signal to “by-pass” equalization circuitry, within the XRT73L04 Device. Conversely,
if the user commands this output signal to toggle “Low”, then the incoming DS3
line signal with be routed through the equalization circuitry. For information on the
criteria that should be used when deciding whether to bypass the equalization cir-
cuitry or not, please consult the “XRT73L04 E3/DS3/STS-1 LIU IC” data sheet.
Writing a “1” to Bit 5 of the Line Interface Drive Register (Address = 0x72) will
cause this output pin to toggle “High”. Writing a “0” to this bit-field will cause this
output pin to toggle “Low”.
N
OTE
:
If the designer is not using the XRT73L04 E3/DS3/STS-1 LIU IC, then this
output pin can be used for other purposes.
P23
N24
N25
N26
RLOL_0
RLOL_1
RLOL_2
RLOL_3
I
Receive Loss of Lock Indicator—from the XRT73L04 E3/DS3/STS-1 LIU IC:
This input pin is intended to be connected to the RLOL (Receive Loss of Lock) out-
put pin of the XRT73L04 LIU IC. The user can monitor the state of this pin by read-
ing the state of Bit 1 (RLOL) within the Line Interface Scan Register (Address =
0x73). If this input pin is “Low”, then it means that the phase-locked-loop circuitry,
within the XRT73L04 is properly locked onto the incoming DS3 data-stream; and is
properly recovering clock and data from this DS3 data-stream. However, if this
input pin is “High”, then it means that the phase-locked-loop circuitry, within the
XRT73L04 has lost lock with the incoming DS3 data-stream, and is not properly
recovering clock and data.
For more information on the operation of the XRT73L04 E3/DS3/STS-1 LIU IC,
please consult the "XRT73L04 E3/DS3/STS-1 LIU IC" data sheet.
N
OTE
:
If the designer is not using the XRT73L04 DS3/E3/STS-1 LIU IC, this input
pin can be used for other purposes.
A15
B14
A14
D14
RLOOP_0
RLOOP_1
RLOOP_2
RLOOP_3
O
Remote Loop-back Output Pin (to the XRT73L04 DS3/E3/STS-1 LIU IC):
This output pin is intended to be connected to the RLOOP input pin of the
XRT73L04 LIU IC. This output pin, along with the LLOOP input pin permits the user
to configure the XRT73L04 to operate in either of the following three (3) loop-back
modes.
Analog Local Loop-Back Mode
Digital Local Loop-Back Mode
Remote Loop-Back Mode.
For a detailed description on how to configure the XRT73L04 to operate in each of
these loop-back modes, please see Section _.
Writing a “1” to bit 1 of the “Line Interface Drive Register (Address = 0x72) will
cause this output pin to toggle “High”. Writing a “0” to this bit-field will cause the
RLOOP output to toggle “Low”.
N
OTE
:
If the customer is not using the XRT73L04 DS3/E3/STS-1 IC, then this out-
put pin can be used for other purposes.
PIN DESCRIPTIONS
P
IN
#
N
AME
T
YPE
D
ESCRIPTION
相關PDF資料 |
PDF描述 |
|---|---|
| XRT7300IV | E3/DS3/STS-1 LINE INTERFACE UNIT |
| XRT7300 | E3/DS3/STS-1 LINE INTERFACE UNIT |
| XRT7302 | 2 Channel E3/DS3/STS-1 Line Interface Unit(2通道 E3/DS3/STS-1線接口單元) |
| XRT73L02M | TWO CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT |
| XRT73L02MIV | TWO CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| XRT72L74IB | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecommunication IC |
| XRT7300 | 制造商:EXAR 制造商全稱:EXAR 功能描述:E3/DS3/STS-1 LINE INTERFACE UNIT |
| XRT7300ES | 功能描述:網(wǎng)絡控制器與處理器 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 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| XRT7300IV | 功能描述:外圍驅(qū)動器與原件 - PCI . . RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray |
| XRT7300IV-F | 功能描述:外圍驅(qū)動器與原件 - PCI RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray |
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