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參數(shù)資料
| 型號： | XRT79L72 |
| 廠商： | Exar Corporation |
| 英文描述： | 2 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC |
| 中文描述： | 2 -通道DS3/E3自動(dòng)柜員機(jī)用戶到網(wǎng)絡(luò)接口/ Combo IC對購買力平價(jià) |
| 文件頁數(shù)： | 35/72頁 |
| 文件大小： | 441K |
| 代理商： | XRT79L72 |
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xr
2 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC
PRELIMINARY
XRT79L72
REV. P1.0.2
32
C1
A23
RxGFC
_0
/
RxIdle
_0
RxGFC
_1
/
RxIdle
_1
O
O
Receive GFC Nibble Field - Output Pin/Receive Idle Sequence Indicator:
The function of these output pins depend upon whether the XRT79L72 is oper-
ating in the ATM Mode or in the High-Speed HDLC Controller Mode.
ATM Mode - RxGFC:
These pins, along with the RxGFCClk and the RxGFCMSB pins form the
Receive GFC Nibble-Field serial output port. These pins will serially output the
contents of the GFC Nibble field of each cell that is processed via the Receive
Cell Processor. This data is serially clocked out of this pin on the rising edge of
the RxGFCClk signals. The MSB of each GFC value is designated by a pulse
at the RxGFCMSB output pins.
High-Speed HDLC Controller Mode - RxIdle:
The combination of the RxIdle and ValidFCS output signals are used to convey
information about data that is being output via the Receive HDLC Controller out-
put Data bus (RxHDLCDatn_[7:0]).
If RxIdle = "High":
The Receive HDLC Controller block will drive this output pin "High" anytime the
flag sequence octet (0x7E) is present on the RxHDLCDatn[7:0] output data bus.
If RxIdle and ValidFCS are both "High":
The Receive HDLC Controller block has received a complete HDLC frame, and
has determined that the FCS value within this HDLC frame are valid.
If RxIdle is "High" and ValidFCS is "Low":
The Receive HDLC Controller block has received a complete HDLC frame, and
has determined that the FCS value within this HDLC frame is invalid.
If RxIdle is "High" and ValidFCS is "Low":
The Receive HDLC Controller block has received an ABORT sequence.
C2
B22
RxGFCClk
_0
RxGFCClk
_1
O
O
Received GFC Nibble Serial Output Port Clock Signal:
These output pins function as a part of the Receive GFC Nibble-Field Serial
Output Port, also consisting of the RxGFC and RxGFCMSB pins. These pins
provide a clock pulse which allows external circuitry to latch in the GFC Nibble-
Data via the RxGFC output pin.
N
OTE
:
These output pins are only active if the XRT79L72 is operating in the
ATM UNI Mode.
D4
A22
RxGFCMSB
_0
RxGFCMSB
_1
O
O
Receive GFC Nibble Field - MSB Indicator:
These output pins function as a part of the Receive GFC Nibble Field Serial
Output port which also consists of the RxGFC and RxGFCClk pins. These pins
pulse "High" the instant that the MSB (Most Significant Bit) of a GFC Nibble is
being output on the RxGFC pin.
N
OTE
:
These output pins are only active if the XRT79L72 is operating in the
ATM UNI Mode.
P
IN
#
N
AME
TYPE
D
ESCRIPTION
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| XRT79L72IB | 2 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC |
| XRT79L73 | 3 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC |
| XRT79L73IB | 3 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC |
| XRT79L74 | 4 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC |
| XRT79L74IB | 4 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XRT79L72IB | 制造商:EXAR 制造商全稱:EXAR 功能描述:2 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC |
| XRT79L73 | 制造商:EXAR 制造商全稱:EXAR 功能描述:3 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC |
| XRT79L73IB | 制造商:EXAR 制造商全稱:EXAR 功能描述:3 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC |
| XRT79L74 | 制造商:EXAR 制造商全稱:EXAR 功能描述:4 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC |
| XRT79L74IB | 制造商:EXAR 制造商全稱:EXAR 功能描述:4 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC |
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