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XRT7250 Datasheet(PDF) 329 Page - Exar Corporation |
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XRT7250 Datasheet(HTML) 329 Page - Exar Corporation |
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329 / 463 page  XRT7250 áç áç áç áç 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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