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參數(shù)資料
| 型號(hào)： | 84225 |
| 廠商： | LSI Corporation |
| 英文描述： | Quad 100BaseTX/100BaseFX/10BaseT Physical Layer Device （Highly Integrated Ethernet Transceiver For Twisted Pair And Fiber Ethernet Applications）(四通道100BaseTX/100BaseFX/10BaseT 物理層處理器（高度集成的以太網(wǎng)雙絞線和光纖數(shù)據(jù)收發(fā)器）) |
| 中文描述： | 四100BaseTX/100BaseFX/10BaseT物理層裝置（高度集成的以太網(wǎng)收發(fā)器，雙絞線和光纖以太網(wǎng)的應(yīng)用）（四通道100BaseTX/100BaseFX/10BaseT物理層處理器（高度集成的以太網(wǎng)雙絞線和光纖數(shù)據(jù)收發(fā)器） ） |
| 文件頁(yè)數(shù)： | 26/86頁(yè) |
| 文件大?。?/td> | 1297K |
| 代理商： | 84225 |
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MD400183/A
84225
2.14 LINK INTEGRITY & AUTONEGOTIATION
2.14.1 General
The 84225 can be configured to implement either the
standard link integrity algorithms or the AutoNegotiation
algorithm.
The standard link integrity algorithms are used solely to
establish an active link to and from a remote device.
There are different standard link integrity algorithms for 10
and 100 Mbps modes. The AutoNegotiation algorithm is
used for two purposes:
To automatically configure the device for either 10/100
Mbps and Half/Full Duplex modes
Establish an active link to and from a remote device
The standard link integrity and AutoNegotiation algorithms
are described below.
2.14.2 10Base-T Link Integrity Algorithm
The 84225 uses the same 10Base-T link integrity
algorithm that is defined in IEEE 802.3 clause 14. This
algorithm uses normal link pulses, referred to as NLP’s
and transmitted during idle periods, to determine if a
device has successfully established a link with a remote
device (called Link Pass state). The transmit link pulse
meets the template defined in IEEE 802.3 Clause 14 and
shown in Figure 7. Refer to IEEE 802.3 Clause 14 for
more details if needed.
2.14.3 100Base-TX Link Integrity Algorithm
Since 100Base-TX is defined to have an active idle signal,
then there is no need to have separate link pulses like
those defined for 10Base-T The 84225 uses the squelch
criteria and descrambler synchronization algorithm on the
input data to determine if the device has successfully
established a link with a remote device (called Link Pass
state). Refer to IEEE 802.3 for details on both algorithms.
2.14.4 AutoNegotiation Algorithm
As stated previously, the AutoNegotiation algorithm is
used for two purposes:
To automatically configure the device for either 10/100
Mbps and Half/Full Duplex modes
To establish an active link to and from a remote device
The AutoNegotiation algorithm is the same algorithm that
is defined in IEEE 802.3 Clause 28. AutoNegotiation uses
a burst of link pulses, called fast link pulses and referred to
as FLP’s, to pass up to 16 bits of signaling back and forth
between the 84225 and a remote device. The transmit
TX_DI
±
TX_DI
±
a.) Normal Link Pulse (NLP)
b.) Fast Link Pulse (FLP)
D0
D15
D14
D3
D2
D1
Clock
Clock
Clock
Clock
Clock
Clock
Clock
Data
Data
Figure 8. NLP vs. FLP Link Pulse
Data
Data
Data
Data
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