DP83266 datasheet(81/152 Pages) NSC

tên linh kiện	DP83266

Giải thích chi tiết về linh kiện	MACSITM Device (FDDI Media Access Controller and System Interface)

PDF	152 Pages

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nhà sản xuất	NSC [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

TMAX

Zero

TMAX(3)

TMAX(2)

TMAX(1)

TMAX(0)

TMAX(3 – 0)

Time

4096 ms

8192 ms

16384 ms

32768 ms

65536 ms

13107 ms

26214 ms

52429 ms

10486 ms

20972 ms

41943 ms

83886 ms

16777 ms (default)

33554 ms

67109 ms

13422

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