XRT72L56 Datasheet, PDF (347/486 Pages) Exar Corporation – SIX CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER

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PRELIMINARY
XRT72L56
SIX CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER
REV. P1.1.2
FIGURE 145. ILLUSTRATION OF HOW TO INTERFACE THE TERMINAL EQUIPMENT TO THE RECEIVE OVERHEAD DATA
OUTPUT INTERFACE BLOCK (FOR METHOD 1).
E3_OH_Clock_In
RxOHClk
E3_OH_In
RxOH
Rx_Start_of_Frame
RxOHFrame
Terminal Equipment
XRT72L5x E3 Framer IC
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.
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