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XRT7250 bảng dữ liệu(PDF) 329 Page - Exar Corporation

tên linh kiện XRT7250
Giải thích chi tiết về linh kiện  DS3/E3 FRAMER IC
PDF  463 Pages
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nhà sản xuất  EXAR [Exar Corporation]
Trang chủ  http://www.exar.com
Logo EXAR - Exar Corporation

XRT7250 bảng dữ liệu(HTML) 329 Page - Exar Corporation

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XRT7250
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DS3/E3 FRAMER IC
REV. 1.1.1
310
Method 1 Operation of the Terminal Equipment
If the Terminal Equipment intends to sample any
overhead data from the inbound E3 data stream (via
the Receive Overhead Data Output Interface block)
then it is expected to do the following:
1. Sample the state of the RxOHFrame signal (e.g.,
the Rx_Start_of_Frame input signal) on the rising
edge of the RxOHClk (e.g., the
E3_OH_Clock_In) signal.
2. Keep track of the number of rising clock edges
that have occurred in the RxOHClk (e.g., the
E3_OH_Clock_In) signal, since the last time the
RxOHFrame signal was sampled "High”. By
doing this, the Terminal Equipment will be able to
keep track of which overhead byte is being output
via the RxOH output pin. Based upon this infor-
mation, the Terminal Equipment will be able to
derive some meaning from these overhead bits.
FIGURE 145. ILLUSTRATION OF HOW TO INTERFACE THE TERMINAL EQUIPMENT TO THE RECEIVE OVERHEAD DATA
OUTPUT INTERFACE BLOCK (FOR METHOD 1).
Terminal Equipment
XRT7250 E3 Framer IC
RxOHClk
E3_OH_Clock_In
RxOH
RxOHFrame
E3_OH_In
Rx_Start_of_Frame



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