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參數(shù)資料
| 型號： | XRT79L74 |
| 廠商： | Exar Corporation |
| 英文描述： | 4 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC |
| 中文描述： | 4 -通道DS3/E3自動柜員機用戶到網(wǎng)絡(luò)接口/ Combo IC對購買力平價 |
| 文件頁數(shù)： | 10/70頁 |
| 文件大小： | 547K |
| 代理商： | XRT79L74 |
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XRT79L74
REV. P1.0.0
PRELIMINARY
4 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC
8
U5
N24
V2
R26
TxFrame1
TxFrame2
TxFrame3
TxFrame4
O
O
O
O
Transmit End of DS3/E3 Frame Indicator:
These output pins will pulse "High" for one DS3 or E3 clock period, when the
Transmit Section of the XRT79L74 is processing the last bit of a given DS3 or E3
frame. The implications of these output pins, for each mode of operation, are
described below.
ATM UNI/PPP/High-Speed HDLC Controller Mode:
These output pins serve as an end-of-frame indication to the local terminal
equipment.
Clear-Channel Framer Mode:
If the XRT79L74 is configured to operate in the Clear-Channel Framer mode,
then these output pins serve to alert the Local Terminal Equipment that it needs
to begin transmission of a new DS3 or E3 frame. Hence, the Local Terminal
Equipment uses these output signals to maintain Framing Alignment with the
XRT79L74.
AF1
W25
AF2
Y24
TxFrameRef1
TxFrameRef2
TxFrameRef3
TxFrameRef4
I
I
I
I
Transmit DS3/E3 Framer - Framing Alignment Input pin:
If the the Transmit Section of the XRT79L74 is configured to operate in the
Local-Timing/Frame-Slave Mode, then the Transmit DS3/E3 Framer block will
use these input signals as the Framing Reference.
When the XRT79L74 is configured to operate in this mode any rising edge at
these input pins will cause the Transmit DS3/E3 Framer block to begin its cre-
ation of a new DS3 or E3 frame. Consequently, the user must supply a clock sig-
nal that is equivalent to the DS3 or E3 frame rates to these input pins. Further, it
is imperative that this clock signal be synchronized with the 44.736MHz or
34.368MHz clock signal applied to the TxInClk input pins.
N
OTE
:
These input pins should be tied to GND if they are not to be used as the
Transmit DS3/E3 Framer - Framing Reference input signals.
U4
N25
V1
R25
TxInClk1
TxInClk2
TxInClk3
TxInClk4
I
I
I
I
Transmit DS3/E3 Framer Block - Timing Reference Signal:
If the Transmit Section of the XRT79L74 is configured to operate in the Local-
Timing Mode, then it will use this signal as the Timing Reference. If the
XRT79L74 is being operating in the DS3 Mode, then the user is expected to
apply a high-quality 44.736MHz clock signal to these input pins. Likewise, if the
XRT79L74 is being operated in the E3 Mode, then the user is expected to apply
a high-quality 34.368MHz clock signal to these input pins.
A Note for Clear-Channel Framer Operation:
If the user is operating the XRT79L74 device in both the Clear-Channel
Framer and Local-Timing modes, then the user should design or
configure the System-Side terminal equipment circuitry, such that
"outbound" DS3 or E3 data will be output, upon the falling edge of
TxInClk. The Transmit Payload Data Input Interface (within the Transmit
Section of the XRT79L74 device) will sample the data, applied to the
"TxSer" input pin, upon the rising edge of TxInClk.
N
OTE
:
This input pin should be tied to GND if the XRT79L74 device is configured
to operate in the "Loop-Timing" Mode.
P
IN
#
N
AME
TYPE
D
ESCRIPTION
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| XRT79L74IB | 4 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC |
| XRT8000ID | Clock Synchronizer/Adapter for Communications |
| XRT8000 | Clock Synchronizer/Adapter for Communications(用于通訊的時鐘同步設(shè)備/調(diào)整器) |
| XRT8001 | WAN Clock for T1 and E1 Systems |
| XRT8001ID | WAN Clock for T1 and E1 Systems |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XRT79L74IB | 制造商:EXAR 制造商全稱:EXAR 功能描述:4 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC |
| XRT8000 | 制造商:EXAR 制造商全稱:EXAR 功能描述:Clock Synchronizer/Adapter for Communications |
| XRT8000_06 | 制造商:EXAR 制造商全稱:EXAR 功能描述:Clock Synchronizer/Adapter for Communications |
| XRT8000D | 制造商:EXAR 制造商全稱:EXAR 功能描述:CLOCK SYNCHRONIZER/ADAPTER FOR COMMUNICATIONS |
| XRT8000ES | 功能描述:鎖相環(huán) - PLL WAN CLOCK RoHS:否 制造商:Silicon Labs 類型:PLL Clock Multiplier 電路數(shù)量:1 最大輸入頻率:710 MHz 最小輸入頻率:0.002 MHz 輸出頻率范圍:0.002 MHz to 808 MHz 電源電壓-最大:3.63 V 電源電壓-最小:1.71 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:QFN-36 封裝:Tray |
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