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參數(shù)資料
| 型號： | LXT970A |
| 廠商： | Intel Corp. |
| 英文描述： | Dual-Speed Fast Ethernet Transceiver |
| 中文描述： | 雙速度快速以太網(wǎng)收發(fā)器 |
| 文件頁數(shù)： | 36/74頁 |
| 文件大?。?/td> | 1061K |
| 代理商： | LXT970A |
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LXT970A
—
Dual-Speed Fast Ethernet Transceiver
36
Datasheet
2.8.1.1
100X Preamble Handling
When the MAC asserts TX_EN, the PCS substitutes a /J/K symbol pair, also known as the Start of
Stream Delimiter or SSD, for the first two nibbles received across the MII. The PCS layer
continues to encode the remaining MII data, following
Table 17
, until TX_EN is de-asserted. It
then returns to supplying IDLE symbols to the line driver.
In the receive direction, the PCS layer performs the opposite function, substituting two preamble
nibbles for the SSD.
2.8.1.2
10T Preamble Handling
In 10BASE-T Mode, the LXT970A strips the entire preamble off of received packets. CRS is
asserted a few bit times after carrier is detected. RX_DV is held for the duration of the preamble.
When RX_DV is asserted, the very first two nibbles driven by the LXT970A are the SFD
“
5D
”
hex
followed by the body of the packet. In 10T loopback
the LXT970A loops back whatever the MAC transmits to it, including the preamble.
2.8.1.3
Data Errors (100X Only)
Figure 16
shows normal reception. When the LXT970A receives invalid symbols from the line, it
asserts RX_ER, as shown in
Figure 17
.
Figure 15. LXT970A Protocol Sublayers
Encoder/Decoder
Serializer/De-serializer
Scrambler/De-
scrambler
Link/Carrier Detect
PCS
Layer
PMA
Layer
PMD
Layer
MII Interface
PECL Interface
Fiber Transceiver
LXT970A
100BASETX
100BASE-FX
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LXT970 | Fast Ethernet Transceiver |
| LXT970QC | Fast Ethernet Transceiver |
| LXT971A | 3.3V Dual-Speed Fast Ethernet PHY Transceiver |
| LXT972A | 3.3V Dual-Speed Fast Ethernet Transceiver Datasheet |
| LXT972ALC | 3.3V Dual-Speed Fast Ethernet Transceiver Datasheet |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LXT970AQC | 制造商:LEVEL ONE 功能描述: 制造商:LEVELONE 功能描述: 制造商: 功能描述: 制造商:LEVEL1 功能描述: |
| LXT970AQC.B11 | 制造商:Intel 功能描述: |
| LXT970ATC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecomm/Datacomm |
| LXT970QC | 制造商:LEVEL ONE 功能描述: 制造商:Level One 功能描述:LAN Transceiver, Single, 64 Pin, Plastic, QFP 制造商:Level One Communications 功能描述:LAN Transceiver, Single, 64 Pin, Plastic, QFP |
| LXT971A | 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:3.3V Dual-Speed Fast Ethernet PHY Transceiver |
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