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DP83266 датащи(PDF) 79 Page - National Semiconductor (TI) |
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DP83266 датащи(HTML) 79 Page - National Semiconductor (TI) |
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79 / 152 page ![]() 70 Control Information (Continued) 754 Beacon Information Transmit Beacon Type (TBT) Transmit Beacon Type 0 (TBT0) represents the Transmit Beacon Type to be transmitted in the Information field of a Beacon frame TBT1 – TBT3 are not used by the Ring Engine When the Beacon state is reached as a result of a failed Claim process the first byte of the Beacon Information field is forced to Zero to produce a Beacon Type 0 as required by the MAC Standard When the Beacon state is reached as a result of a Beacon Request (when FunctionBCN is set) bits TBT(31 – 24) are transmit- ted as the Information field Access Rules Address Read Write 054–057h Stop Mode Stop Mode Register Bits D7 D6 D5 D4 D3 D2 D1 D0 TBT0 TBT(31) TBT(30) TBT(29) TBT(28) TBT(27) TBT(26) TBT(25) TBT(24) TBT1 TBT(23) TBT(22) TBT(21) TBT(20) TBT(19) TBT(18) TBT(17) TBT(16) TBT2 TBT(15) TBT(14) TBT(13) TBT(12) TBT(11) TBT(10) TBT(9) TBT(8) TBT3 TBT(7) TBT(6) TBT(5) TBT(4) TBT(3) TBT(2) TBT(1) TBT(0) 76 TIMER VALUES The Ring Engine stores several timer values and thresholds used in normal operation With the exception of TNEG the Timers use an exponential expansion on a 4-bit value to produce a negative twos complement 24-bit value used by the Timer Logic The Timer Values are always readable These parameters are writable in Stop Mode The Timers include the following timers Asynchronous Priority Threshold (THSH1) Maximum Token Rotation Time (TMAX) Valid Transmission Timer (TVX) Negotiated Target Rotation Time (TNEG0–3) 79 |
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