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| 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(yè)數(shù)： | 44/128頁(yè) |
| 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.
The byte count value in the status word is the total number of bytes
stored in the RX FIFO for the particular packet.
The byte count always includes the four bytes associated with the CRC,
regardless of whether or not the CRC has been removed by the receive
MAC. The byte count also does not include the preamble octets.
The Receive Status Word is always read out of the system interface on
the next full 32-bit word boundary, following the end of packet data, as
shown in
Figure 4
.
3.10.3 Status Word Disable
The status word is normally appended to the end of all good receive
packets. The receive status word can be not appended to the end of the
packet and thus disabled by setting the status word disable bit in the
Configuration 3 register.
Table 8
Receive Status Word Definition
RXTXDATA31
RXTXDATA16
BC15 BC14 BC13 BC12 BC11 BC10 BC9 BC8
BC7
BC6 BC5
BC4
BC3
BC2
BC1
BC0
RXER RXAB
GOOD OSIZE USIZE DRIB CRC OVFL
RXTXDATA15
RXTXDATA0
Symbol
Name
Position On
RXTXDATA[31:0] Pins
BC[15:0]
—
RXER
Byte Count
—
RXER Error
Actual byte count of receive packet
Reserved
1 = Receive packet had RXER symbol error
reported over MII from external PHY
1 = Receive packet was aborted with
RXABORT pin
Reserved
1 = Receive packet is a good frame
1 = Receive packet is greater than minimum
size
1 = Receive packet is less than minimum
size
1 = Receive packet has a non-integer # of
bits or nibbles (dribble)
RXTXDATA[31:16]
RXTXDATA[15:9]
RXTXDATA8
RXAB
Packet
—
GOOD
OSIZE
RXABORT
RXTXDATA7
—
Good Packet
Oversize Error
RXTXDATA6
RXTXDATA5
RXTXDATA4
USIZE
Undersize Error
RXTXDATA3
DRIB
Dribble Error
RXTXDATA2
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