參數(shù)資料
型號: XRT72L74
廠商: Exar Corporation
元件分類: 通信及網(wǎng)絡(luò)
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): 24/104頁
文件大?。?/td> 1301K
代理商: XRT72L74
XRT72L74
FOUR CHANNEL, DS3 ATM UNI/CLEAR-CHANNEL FRAMER
REV. P1.0.0
á
PRELIMINARY
24
M24
M25
M26
M23
RxSerClk/
RxPOHClk_0
RxSerClk/
RxPOHClk_1
RxSerClk/
RxPOHClk_2
RxSerClk/
RxPOHClk_3
O
Clear Channel Mode Receive Clock Output Signal for Serial Data Interface/
Receive PLCP Frame Path Overhead (POH) Byte Serial Output Port—Output
Clock Signal:
The exact functionality of this output pin depends upon whether the XRT72L71
Framer IC is operating in the Clear Channel or ATM UNI Mode.
Clear Channel Mode - RxSerClk:
In clear channel mode, this pin can be used by the external interface to sample the
clear channel serial data stream on RxSer pin. The Receive Section of the
XRT72L71 will output all “inbound” DS3 data, via the “RxSerData” output pin,
upon the rising edge of this output pin. Hence, the user should be sampling the
data (on the “RxSerData” output pin) upon the rising edge of this clock.
ATM UNI MODE - RxPOHClk:
In the ATM UNI mode of operation, this pin serves as RxPOHClk.
This output clock pin, along with RxPOH, RxPOHframe pins comprise the
'Receive PLCP OH serial output' interface.
B3
C10
C19
D24
RxPOS_0
RxPOS_1
RxPOS_2
RxPOS_3
I
Receive Positive Data Input:
The exact role of this input pin depends upon whether the UNI is operating in the
Unipolar or Bipolar Mode.
Unipolar Mode:
This input pin functions as the “Single-Rail” input for the “incoming” DS3 data
stream. The signal at this input pin will be sampled and latched (into the Receive
DS3 Framer) on the “user-selected” edge of the RxLineClk signal.
Bipolar Mode:
This input functions as one of the dual rail inputs for the incoming AMI/B3ZS
encoded DS3 data that has been received from an external Line Interface Unit
(LIU) IC. RxNEG functions as the other dual rail input for the UNI. When this input
pin is asserted, it means that the LIU has received a “positive polarity” pulse from
the line.
PIN DESCRIPTIONS
P
IN
#
N
AME
T
YPE
D
ESCRIPTION
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