DP83266 datasheet(80/152 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)

761 Asynchronous Priority Threshold (THSH1)

The Ring Engine currently supports one Asynchronous Priority Threshold in addition to the default threshold at TTRT The

Asynchronous Priority Threshold is used in a magnitude comparison with THT when an Asynchronous Priority Request is

presented to the MAC Request Interface

Bits 7 – 4 are always written to Zero and are always read as Zero

When more than one threshold is used the users of THSH1 have the lowest priority All asynchronous transmissions are limited

by TTRT If the Late Flag is set no frames may be transmitted regardless of the value of the Asynchronous Priority Threshold

Access Rules

Address

Read

Write

087h

Always

Stop Mode

THSH1

Zero

THSH(3)

THSH(2)

THSH(1)

THSH(0)

THSH1(3 – 0)

Time remaining in THT when

token becomes unusable

1024 ms

2048 ms

4096 ms

8192 ms

16384 ms

32768 ms

65536 ms

13107 ms

26214 ms

52429 ms

10486 ms

20972 ms

41943 ms (default)

83886 ms

16777 ms

33554 ms

Warning The default value may not be appropriate for all values of TNEG In some cases this could result in a request that is NEVER serviced

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