DP83266 datasheet(79/152 Pages) NSC

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

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)

DP83266 데이터시트(PDF) 79 Page - National Semiconductor (TI)

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