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DS3173N Scheda tecnica(PDF) 80 Page - Dallas Semiconductor |
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DS3173N Scheda tecnica(HTML) 80 Page - Dallas Semiconductor |
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80 / 232 page ![]() DS3171/DS3172/DS3173/DS3174 80 of 231 Figure 10-14. DS3 Frame Format 680 Bits 7 Sub- Frames X 1 X 2 P 1 P 2 M 1 M 2 M 3 F 11 F 21 F 31 F 41 F 51 F 61 F 71 F 12 F 22 F 32 F 42 F 52 F 62 F 72 F 13 F 23 F 33 F 43 F 53 F 63 F 73 F 14 F 24 F 34 F 44 F 54 F 64 F 74 C 11 C 21 C 31 C 41 C 51 C 61 C 71 C 12 C 22 C 32 C 42 C 52 C 62 C 72 C 13 C 23 C 33 C 43 C 53 C 63 C 73 The subframe framer continually searches four adjacent bit positions for a subframe boundary. A subframe alignment bit (F-bit) checker checks each bit position. All four bit positions must fail before any other bit positions are checked for a subframe boundary. There are 170 possible bit positions that must be checked, and four positions are checked simultaneously. Therefore up to 43 checks may be needed to identify the subframe boundary. The subframe framer enables the multiframe frame once it has identified a subframe boundary. Refer to Figure 10-15 for the subframe framer state diagram. Figure 10-15. DS3 Subframe Framer State Diagram Sync Load Verify All 4 bit positions failed 2 F-bits loaded |
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