DP83261AVF datasheet(56/132 Pages) NSC

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60 Control Information (Continued)

653 Claim Information Requested Target Token Rotation Time (TREQ)

The Requested Target Token Rotation Time (TREQ) is stored in registers TREQ0 – TREQ3 TREQ(31 – 0) is represented as a

negative two’s complement number This value is transmitted in all Claim frames generated by the Ring Engine

Bits TREQ(31 – 24) are always transmitted as and compared with FFh and bits TREQ(7 – 0) are always transmitted as and

compared with 00h independent of the value stored in the MAC Parameter RAM TREQ is therefore programmable with

2048 ms resolution and a maximum value of 134 seconds

ACCESS RULES

Address

Read

Write

50 – 53h

Stop Mode

TREQ0

TREQ(31)

TREQ(30)

TREQ(29)

TREQ(28)

TREQ(27)

TREQ(26)

TREQ(25)

TREQ(24)

TREQ1

TREQ(23)

TREQ(22)

TREQ(21)

TREQ(20)

TREQ(19)

TREQ(18)

TREQ(17)

TREQ(16)

TREQ2

TREQ(15)

TREQ(14)

TREQ(13)

TREQ(12)

TREQ(11)

TREQ(10)

TREQ(9)

TREQ(8)

TREQ3

TREQ(7)

TREQ(6)

TREQ(5)

TREQ(4)

TREQ(3)

TREQ(2)

TREQ(1)

TREQ(0)

654 Beacon Information Transmit Beacon Type (TBT)

Transmit Beacon Type 0 – 3 (TBT0 – 3) represents the Transmit Beacon Type to be transmitted in the information field of a

Beacon frame

When the Beacon state is reached as a result of a failed Claim process the first byte of the Beacon Information field bits

TBT31 – 24 are forced to Zero to produce a Beacon Type 0 as required by the MAC Standard Bits TBT(23 – 0) are transmitted

as the rest of the Information field

When the Beacon state is reached as a result of a Beacon Request (when FunctionBCN is set) bits TBT(31 – 0) are transmitted

as the Information field Bit TBT(0) is transmitted last

ACCESS RULES

Address

Read

Write

54 – 57h

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)

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