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DP83261AVF Datasheet(PDF) 60 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # DP83261AVF
Description  BMAC Device (FDDI Media Access Controller)
PDF  132 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

DP83261AVF Datasheet(HTML) 60 Page - National Semiconductor (TI)

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60 Control Information (Continued)
Negotiated Target Rotation Time (TNEG)
The Negotiated Target Rotation Time (TNEG0 – 3) is a 32-bit twos complement value It is the result of the Claim Process TNEG
is loaded either directly from the received Claim Information field (T
Bid
Rc) or via the Control Interface
The first byte of TNEG (bits TNEG(31 – 24)) always contains FFh TNEG has a maximum value of 134 seconds and a resolution
of 80 ns
TRT is loaded with TNEG when the Ring
Operational flag is set TNEG is not automatically compared with TREQ when the
Ring
Operational flag is set This should be checked by software whenever the ring becomes operational to make sure that
TNEG is less than or equal to TREQ
An implementation of the SM
ControlRequest (Reset) should load TNEG with TMAX to remove any possibility of the station
entering Claim early
On a Master Reset (FunctionMARST is set) TNEG is set to FFE00000 which corresponds to 167772 ms the default TMAX
specified by the FDDI MAC Standard
ACCESS RULES
Address
Read
Write
98 – 9Bh
Always
Stop Mode
D7
D6
D5
D4
D3
D2
D1
D0
TNEG0
TNEG(31)
TNEG(30)
TNEG(29)
TNEG(28)
TNEG(27)
TNEG(26)
TNEG(25)
TNEG(24)
TNEG1
TNEG(23)
TNEG(22)
TNEG(21)
TNEG(20)
TNEG(19)
TNEG(18)
TNEG(17)
TNEG(16)
TNEG2
TNEG(15)
TNEG(14)
TNEG(13)
TNEG(12)
TNEG(11)
TNEG(10)
TNEG(9)
TNEG(8)
TNEG3
TNEG(7)
TNEG(6)
TNEG(5)
TNEG(4)
TNEG(3)
TNEG(2)
TNEG(1)
TNEG(0)
60



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