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

[Old version datasheet] Texas Instruments acquired National semiconductor.
номер детали DP83266
подробное описание детали  MACSITM Device (FDDI Media Access Controller and System Interface)
PDF  152 Pages
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производитель  NSC [National Semiconductor (TI)]
домашняя страница  http://www.national.com
Logo NSC - National Semiconductor (TI)

DP83266 датащи(HTML) 79 Page - National Semiconductor (TI)

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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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