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參數(shù)資料
| 型號(hào)： | 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)： | 25/70頁 |
| 文件大小： | 833K |
| 代理商： | LXT972A |
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3.3V Dual-Speed Fast Ethernet Transceiver Datasheet
—
LXT972A
Datasheet
25
3.5.1.3
Controlling Auto-Negotiation
When auto-negotiation is controlled by software, the following steps are recommended:
After power-up, power-down, or reset, the power-down recovery time, as specified in
Table 34
on page 54
, must be exhausted before proceeding.
Set the auto-negotiation advertisement register bits.
Enable auto-negotiation (set MDIO bit 0.12 = 1).
3.5.2
Parallel Detection
For the parallel detection feature of auto-negotiation, the LXT972A also monitors for 10BASE-T
Normal Link Pulses (NLP) and 100BASE-TX Idle symbols. If either is detected, the device
automatically reverts to the corresponding operating mode. Parallel detection allows the LXT972A
to communicate with devices that do not support auto-negotiation.
3.6
MII Operation
The LXT972A device implements the Media Independent Interface (MII) as defined in the IEEE
802.3 standard. Separate channels are provided for transmitting data from the MAC to the
LXT972A (TXD), and for passing data received from the line (RXD) to the MAC. Each channel
has its own clock, data bus, and control signals. Nine signals are used to pass received data to the
MAC: RXD<3:0>, RX_CLK, RX_DV, RX_ER, COL, and CRS. Seven signals are used to transmit
data from the MAC: TXD<3:0>, TX_CLK, TX_EN, and TX_ER.
Figure 8. Link Establishment Overview
Check Value
0.12
Start
Done
Enable
Auto-Neg/Parallel Detection
Go To Forced
Settings
Attempt Auto-
Negotiation
Listen for 10T
Link Pulses
Listen for 100TX
Idle Symbols
Link Up
NO
YES
Power-Up, Reset,
or Link Failure
Disable
Auto-Negotiation
0.12 = 0
0.12 = 1
相關(guān)PDF資料 |
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| 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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