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參數(shù)資料
| 型號： | L84302 |
| 元件分類： | 通用總線功能 |
| 英文描述： | L84302 Quad 100/10 Mbps 4-Port Ethernet Controller with RMON/SNMP Management Counters technical manual 4/02 |
| 中文描述： | L84302四100/10 Mbps的4端口以太網(wǎng)的遠(yuǎn)程監(jiān)控控制器/ SNMP管理處的技術(shù)手冊，4月2日 |
| 文件頁數(shù)： | 76/128頁 |
| 文件大?。?/td> | 997K |
| 代理商： | L84302 |
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76 of 128
April, 2002
L84302 Quad 4-Port Ethernet Controller - Technical Manual
Copyright 1997-2002 by LSI Logic Corporation. All rights reserved.
Bit 0 occurs on CDST0/CDST8 pin
Table 21
FIFO Threshold Register Definition
7
6
5
4
3
2
1
0
RXTHR3
R/W
RXTHR2
R/W
RXTHR1
R/W
RXTHR0
R/W
TXTHR3
R/W
TXTHR2
R/W
TXTHR1
R/W
TXTHR0
R/W
Bit
Symbol
Name
Definition
R/W
Def.
7
6
5
4
RXTHR3
RXTHR2
RXTHR1
RXTHR0
RX FIFO
Threshold
Settings
These bits set the RX FIFO threshold, which causes
RXRDY to be asserted when the amount of data in the
RX FIFO is greater than or equal to the threshold
below:
1111 = 30 double words of data in RX FIFO
1110 = 28 double words of data in RX FIFO
1101 = 26 double words of data in RX FIFO
1100 = 24 double words of data in RX FIFO
1011 = 22 double words of data in RX FIFO
1010 = 20 double words of data in RX FIFO
1001 = 18 double words of data in RX FIFO
1000 = 16 double words of data in RX FIFO
0111 = 14 double words of data in RX FIFO
0110 = 12 double words of data in RX FIFO
0101 = 10 double words of data in RX FIFO
0100 = 8 double words of data in RX FIFO
0011 = 6 double words of data in RX FIFO
0010 = 4 double words of data in RX FIFO
0001 = 2 double words of data in RX FIFO
0000 = 1 double words of data in RX FIFO
R/W
0
3
2
1
0
TXTHR3
TXTHR2
TXTHR1
TXTHR0
TX FIFO
Threshold
Settings
These bits set the TX FIFO threshold, which causes
TXRDY to be asserted when the amount of space in the
TX FIFO is greater than or equal to the threshold below:
1111 = 30 double words of space in TX FIFO
1110 = 28 double words of space in TX FIFO
1101 = 26 double words of space in TX FIFO
1100 = 24 double words of space in TX FIFO
1011 = 22 double words of space in TX FIFO
1010 = 20 double words of space in TX FIFO
1001 = 18 double words of space in TX FIFO
1000 = 16 double words of space in TX FIFO
0111 = 14 double words of space in TX FIFO
0110 = 12 double words of space in TX FIFO
0101 = 10 double words of space in TX FIFO
0100 = 8 double words of space in TX FIFO
0011 = 6 double words of space in TX FIFO
0010 = 4 double words of space in TX FIFO
0001 = 2 double words of space in TX FIFO
0000 = 1 double words of space in TX FIFO
R/W
0
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