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| 型号： | E-1110 |
| 英文描述： | E-1110 10/100/1000 Mbits/s Ethernet MAC preliminary technical manual 4/01 |
| 中文描述： | 电子1110 10/100/1000 Mbits /秒以太网MAC初步的技术手册4 / 01 |
| 文件页数： | 80/108页 |
| 文件大小： | 577K |
| 代理商： | E-1110 |
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E-110 Core Interface Signals
3-35
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
vector. The carrier event is not associated with
this packet. A carrier event is dened 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 Mbits/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 Mbits/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).
RSV23
Bad packet received. For 100 Mbits/s operation,
a bad packet contains at least one of the
following problems: 4B/5B code violations, bad
FCS, less than 64 bytes (short packet), or more
than 1518 bytes or 32 Kbytes (long packet).
For 10 Mbits/s operation, a bad packet contains
at least one of the following problems: A bad
FCS, less than 64 bytes (short packet), or more
than 1518 bytes or 32 Kbytes (long packet).
RSV22
Long event previously seen. When the MAC
asserts the RSV22 signal, it indicates that at
some time since the last receive vector a long
event was detected, noted, and reported with
this vector. The long event is not associated with
this packet. A long event is activity on the
network in excess of 50,000 bit times. A long
event is not detected in full-duplex mode. If
RSV22 is deasserted, it indicates that a long
event was not seen.
RSV21
Invalid preamble content (not 55H) or code
(0x50555) seen in the last reception.
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