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參數(shù)資料
| 型號： | VT6516 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 16/12 PORT 10/1000 ASE T/TX |
| 中文描述： | 16/12港口10/1000日月光噸/德克薩斯州 |
| 文件頁數(shù)： | 61/73頁 |
| 文件大?。?/td> | 440K |
| 代理商： | VT6516 |
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VIA Technologies, Inc.
Preliminary VT6516 Datarsheet
-
61-
02H
Backoff configuration
bit 0: CAP mode , mild solution for Capture effect
bit 1: MBA mode , aggressive solution for Capture
effect
bit 2: EEFAST mode , drop the 2
nd
collided packet
for testing
purpose, accelerate the drop event
bit 3: CRANDOM mode , use another random
algorithm
bit 4: OFSET , parameter for backoff timer
For that CAP mode is enabled, the TMAC module
will select the backoff time as b’10 or b’11 for the
2
nd
collision, i.e. the backoff time for the 2
nd
collision
is 2 or 3 slot times, where a slot time is 512 bits time
duration.
For that MBA mode is enabled, the TMAC will
select
backoff time for 10
th
collision just as that for 5
th
collision
backoff time for 11
th
collision just as that for 4
th
collision
backoff time for 12
th
collision just as that for 3
rd
collision
backoff time for 13
th
collision just as that for 2
nd
collision
backoff time for 14
th
collision just as that for 1
st
collision
backoff time for 15
th
collision as 0.
For that EEFAST mode is enabled, the Output
Control will drop the packet immediately as the
second collision happens.
For that CRANDOM mode is enabled, the TMAC
will select the backoff time by using the alternative
random algorithm that calculates the backoff time as
that for 10
th
collision.
For OFSET=1, the TMAC will follow the 802.3
standard backoff algorithm. For OFSET=0, the
TMAC will select the backoff time for the 1
st
and 2
nd
collision as that of the 3
rd
collision, i.e. the possible
the backoff time for the 1
st
and 2
nd
collision is ranged
from 0 to 7 in unit of slot time.
BOFFCFG [4:0] 5’b10
000
R/
W
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