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PM7347 Datasheet(PDF) 310 Page - PMC-Sierra, Inc |
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PM7347 Datasheet(HTML) 310 Page - PMC-Sierra, Inc |
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310 / 341 page  S/UNI®-JET Data Sheet Released Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use 310 Document ID: PMC-1990267, Issue 3 Figure 56 Transmit PLCP Overhead TPOHFP TPOHCLK F1 octet M1 octet M2 octet G1 octet B1 octet Z1 octet Z2 octet TPOHCLK B 5 B 4 B 6 B 3 B 7 B 2 TPOH B 1 B 8 B 8 B 1 TPOHFP Don't Care TPOHINS F1 Octet B1 Octet The Transmit PLCP Overhead diagram (Figure 56) shows the insertion of the PLCP path overhead bits using the TPOH input, along with overhead clock (TPOHCLK), and PLCP frame position indicator (TPOHFP). The path overhead octets are shifted in order with the most significant bit (bit 1) of each octet first. The number of growth octets (Zn) in the PLCP frame varies according to the selected PLCP frame format (DS3, DS1, G.751 E3, or E1). The PLCP frame position indicator (TPOHFP) is set high once per PLCP frame period, during bit 1 of the F1 octet, and indicates the transmit PLCP frame timing. TPOH and TPOHINS are sampled using the rising edge of TPOHCLK. The bit presented on TPOH is only inserted into the path overhead if TPOHINS is asserted during the bit in question, or if the appropriate bit is set in the SPLT Control Register. The timing diagram above assumes that the SRCB1 bit in the SPLT Control Register is programmed to logic zero, thereby selecting internal insertion of that octet. |
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