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DP83261 Datasheet(PDF) 59 Page - National Semiconductor (TI) |
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DP83261 Datasheet(HTML) 59 Page - National Semiconductor (TI) |
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59 / 132 page  60 Control Information (Continued) Valid Transmission Time (TVX) The Valid Transmission Timer (TVX) is used to increase the responsiveness of the ring to errors that cause ring recovery The TVX value denotes the maximum time in which a valid frame or token should be seen by this station TVX is stored as a 4-bit value that is expanded to a binary exponential value Bits 7 – 4 are ignored during write operations and read as Zero TVX has a maximum value of 134 seconds with a threshold of 4096 X 2TVX ms On a Master Reset (FunctionMARST is set to One) TVX is set to the value of 6h which corresponds to 262 ms the default by the FDDI MAC Standard ACCESS RULES Address Read Write 97h Always Stop Mode D7 D6 D5 D4 D3 D2 D1 D0 TVX Zero Zero Zero Zero TVX(3) TVX(2) TVX(1) TVX(0) TVX(0 – 3) Time 0 4096 ms 1 8192 ms 2 16384 ms 3 32768 ms 4 65536 ms 5 13107 ms 6 26214 ms (default) 7 52429 ms 8 10486 ms 9 20972 ms A 41943 ms B 83886 ms C 16777 ms D 33554 ms E 67109 ms F 13422s 59 |
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