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參數(shù)資料
| 型號(hào)： | 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(cè)，4月2日 |
| 文件頁數(shù)： | 42/128頁 |
| 文件大?。?/td> | 997K |
| 代理商： | L84302 |
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April, 2002
L84302 Quad 4-Port Ethernet Controller - Technical Manual
Copyright 1997-2002 by LSI Logic Corporation. All rights reserved.
discard error is detected for a transmit packet, (1) transmission is
terminated for that packet (i.e., TXEN is deasserted), (1) the packet is
discarded (that is, all data in the packet containing the error is flushed
from the transmit FIFO) and (3) TXRET is asserted if the packet was
being input from the System Interface when the discard occurred.
3.9.3 Receive Discards
Receive packets can be discarded if certain error conditions are
detected. These error conditions are described in
Table 7
. When a
discard condition is detected on a receive packet, (1) all data is flushed
from the receive FIFO, (2) the input to the RX FIFO is blocked until the
beginning of the next packet and (3) the error condition is indicated by
the assertion of the RXDC pin. The packet can then be discarded by
asserting the RXABORT pin.
Each of the receive discard conditions can be individually removed as a
discard condition by appropriately setting the discard bits in the RX
Command register. When these bits are set, a packet that is afflicted with
the error condition indicated by that bit will not be discarded.
Table 6
Transmit Discard Conditions
Discard Condition
Description
Transmit FIFO Underflow
TX FIFO empty while transmitting the packet. TXEN is deasserted.
Late Collision
A late collision occurred while transmitting the packet.
Carrier Sense Error
CRS never went active during transmission or went from an active
to inactive state during transmission.
16 Collisions
16 attempts to transmit the packet all resulted in transmit collision.
ONETRYMODE and Collision
The ONETRYMODE pin is high and a collisions occurs.
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