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XRT7250 Datasheet(PDF) 436 Page - Exar Corporation |
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XRT7250 Datasheet(HTML) 436 Page - Exar Corporation |
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436 / 463 page  áç áç áç áç XRT7250 DS3/E3 FRAMER IC REV. 1.1.1 417 6.3.4.2 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 in Table 89. FIGURE 205. ILLUSTRATION OF THE SIGNALS THAT ARE OUTPUT VIA THE RECEIVE OVERHEAD OUTPUT INTERFACE (FOR METHOD 1). RxOHClk RxOHFrame RxOH FA1, Bit 7 FA1, Bit 6 FA1, Bit 5 FA1, Bit 4 FA1, Bit 3 Terminal Equipment should sample the “RxOHFrame” and “RxOH” signals here. Recommended Sampling Edges |
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