XRT74L73 Datasheet, PDF (362/488 Pages) Exar Corporation – 3 CHANNEL, ATM UNI/PPP DS3/E3 FRAMING CONTROLLER

XRT74L73
3 CHANNEL, ATM UNI/PPP DS3/E3 FRAMING CONTROLLER
REV. P1.0.1
PRELIMINARY
FIGURE 153. THE SIGNALS THAT ARE OUTPUT VIA THE RECEIVE OVERHEAD OUTPUT INTERFACE FOR METHOD 1
RxOHClk
RxOHFrame
RxOH
FAS, Bit 9
FAS, Bit 8
FAS, Bit 7
FAS, Bit 6
FAS, Bit 5
Terminal Equipment should sample
the “RxOHFrame” and “RxOH” signals
here.
Recommended Sampling Edges
Method 2 - Using RxOutClk and the RxOHEnable
signals
Method 1 requires that the Terminal Equipment be
able to handle an additional clock signal, RxOHClk.
However, there may be a situation in which the Termi-
nal Equipment circuitry does not have the means to
deal with this extra clock signal, in order to use the
Receive Overhead Data Output Interface. Method 2
involves the use of the following signals.
• RxOH
• RxOutClk
• RxOHEnable
• RxOHFrame
Each of these signals are listed and described below
in Table 81 .
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