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參數(shù)資料
| 型號： | E-110 |
| 廠商： | LSI Corporation |
| 英文描述： | 100BASE-T Fast Ethernet Core(100BASE-T快速以太網(wǎng)處理芯片 Fast Ethernet Core) |
| 中文描述： | 100兆- T的快速以太網(wǎng)核心（100兆- T的快速以太網(wǎng)處理芯片快速以太網(wǎng)核心） |
| 文件頁數(shù)： | 54/130頁 |
| 文件大小： | 770K |
| 代理商： | E-110 |
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2-22
Signal Descriptions
The RSV[25:0] signals are stable until the subsequent
RSVP_L pulse. The condition associated with each signal
is valid when the signal is HIGH.
The receive statistics provided by the MAC function can
be used for RMON (remote monitoring) and SNMP (sim-
ple network management protocol). However, the MAC
does not collect the statistics specifically mentioned in
the RMON and SNMP specifications. The MAC provides
basic per packet information that can be collected by an
application built on top of the MAC. The collected infor-
mation can then be used for RMON and SNMP.
The signals in RSV[25:0] have the following functions:
RSV25
Carrier event previously seen. When the MAC
asserts the RSV25 signal, it indicates that at
some time since the last receive vector a carrier
was detected, noted, and reported with this vec-
tor. The carrier event is not associated with this
packet. A carrier event is defined as activity on
the receive channel that does not result in a
packet receive attempt An example would be
receiving a preamble but no SFD, or receiving
more than seven octets of preamble. A carrier
event can occur in either full- or half-duplex
modes. If RSV25 is deasserted, a carrier was not
detected.
RSV24
Good packet received. For 100-Mbit/s operation,
a good packet has no 4B/5B receive code-group
violations, no dribble nibbles, a valid FCS, and a
proper packet length (at least 64 bytes but not
more than 1518 bytes or 32 Kbytes). 4B/5B code-
group violations include the following: 0b00100,
0b00000, 0b00001, 0b00010, 0b00011, 0b00101,
0b00110, 0b01000, 0b01100, 0b10000, and
0b11001.
For 10-Mbit/s operation, a good packet has no
dribble nibbles a valid FCS, and a proper packet
length (at least 64 bytes but not more than 1518
bytes or 32 Kbytes).
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