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DP83266 Datasheet(PDF) 80 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) 80 Page - 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
Register Bits
D7
D6
D5
D4
D3
D2
D1
D0
THSH1
Zero
Zero
Zero
Zero
THSH(3)
THSH(2)
THSH(1)
THSH(0)
THSH1(3 – 0)
Time remaining in THT when
token becomes unusable
0
1024 ms
1
2048 ms
2
4096 ms
3
8192 ms
4
16384 ms
5
32768 ms
6
65536 ms
7
13107 ms
8
26214 ms
9
52429 ms
A
10486 ms
B
20972 ms
C
41943 ms (default)
D
83886 ms
E
16777 ms
F
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
80



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