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DP83266 Datasheet(PDF) 81 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # DP83266
Description  MACSITM Device (FDDI Media Access Controller and System Interface)
PDF  152 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

DP83266 Datasheet(HTML) 81 Page - National Semiconductor (TI)

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70 Control Information (Continued)
762 Maximum Token Rotation Time (TMAX)
The Maximum Token Rotation Time (TMAX) denotes the maximum Target Token Rotation Time supported by this station
TMAX is stored as a 4-bit value that is expanded to a binary exponential value Bits 7 – 4 are ignored during write operations and
are always read as Zero
TMAX has a maximum value of 134 seconds with a threshold of 4096 c 2TMAX ms On a Master Reset (FunctionMARST set
to One) TMAX is set to the value of Ch which corresponds to 167772 ms the default specified by the FDDI MAC Standard
For immediate transmissions from the transmit data state (T2) TMAX is always used to enforce an upper bound on the amount
of time a station may transmit TRT is reset to TMAX on entry to state T2 on immediate requests
Access Rules
Address
Read
Write
093h
Always
Stop Mode
Register Bits
D7
D6
D5
D4
D3
D2
D1
D0
TMAX
Zero
Zero
Zero
Zero
TMAX(3)
TMAX(2)
TMAX(1)
TMAX(0)
TMAX(3 – 0)
Time
0
4096 ms
1
8192 ms
2
16384 ms
3
32768 ms
4
65536 ms
5
13107 ms
6
26214 ms
7
52429 ms
8
10486 ms
9
20972 ms
A
41943 ms
B
83886 ms
C
16777 ms (default)
D
33554 ms
E
67109 ms
F
13422
s
81



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