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參數(shù)資料
| 型號： | LXT972A |
| 廠商： | Intel Corp. |
| 英文描述： | 3.3V Dual-Speed Fast Ethernet Transceiver Datasheet |
| 中文描述： | 3.3雙速快速以太網(wǎng)收發(fā)器數(shù)據(jù)表 |
| 文件頁數(shù)： | 29/70頁 |
| 文件大?。?/td> | 833K |
| 代理商： | LXT972A |
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3.3V Dual-Speed Fast Ethernet Transceiver Datasheet
—
LXT972A
Datasheet
29
3.7
100Mbps Operation
3.7.1
100BASE-X Network Operations
During 100BASE-X operation, the LXT972A transmits and receives 5-bit symbols across the
network link.
Figure 13
shows the structure of a standard frame packet. When the MAC is not
actively transmitting data, the LXT972A sends out Idle symbols on the line.
In 100TX mode, the LXT972A scrambles and transmits the data to the network using MLT-3 line
code (
Figure 14 on page 29
). MLT-3 signals received from the network are descrambled, decoded,
and sent across the MII to the MAC.
.
Figure 13. 100BASE-X Frame Format
Figure 14. 100BASE-TX Data Path
P0
P1
P6
SFD
64-Bit Preamble
(8 Octets)
Start-of-Frame
Delimiter (SFD)
DA
DA
SA
SA
Destination and Source
Address (6 Octets each)
L1
L2
Packet Length
(2 Octets)
D0
D1
Dn
Data Field
(Pad to minimum packet size)
Frame Check Field
(4 Octets)
CRC
I0
InterFrame Gap / Idle Code
(> 12 Octets)
Replaced by
/T/R/ code-groups
End-of-Stream Delimiter (ESD)
IFG
Replaced by
/J/K/ code-groups
Start-of-Stream
Delimiter (SSD)
S0
S1
S2
S3
S4
Parallel
to
Serial
Serial
to
Parallel
MLT3
0
+1
-1
0
0
Transition = 1.
No Transition = 0.
All transitions must follow
pattern: 0, +1, 0, -1, 0, +1...
Scrambler Bypass Data Flow
S0
S1
S2
S3
S4
Standard Data Flow
D0
D1
D2
D3
Parallel
to
Serial
Serial
to
Parallel
D0 D1
D2
D3
4B/5B
S0
S1
S2
S3
S4
MLT3
0
+1
-1
0
0
Transition = 1.
No Transition = 0.
All transitions must follow
pattern: 0, +1, 0, -1, 0, +1...
Scramble
De-
Scramble
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|---|---|
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| LXT9763 | Fast Ethernet 10/100 Hex Transceiver with Full MII |
| LXT9763HC | LAN TRANSCEIVER|HEX|QFP|208PIN|PLASTIC |
| LXT9784 | Transceiver Hardware Integrity Function Overview |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LXT972ALC | 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:3.3V Dual-Speed Fast Ethernet Transceiver Datasheet |
| LXT972LCHFB8 | 制造商:LEVEL_ONE 功能描述: |
| LXT972M | 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:Single-Port 10/100 Mbps PHY Transceiver |
| LXT973QC | 制造商:Intel 功能描述:LAN Transceiver, Dual, 100 Pin, Plastic, QFP |
| LXT974 | 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:Fast Ethernet 10/100 Quad Transceivers |
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