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| 型号： | WJLXT971ALE.A4SE000 |
| 厂商： | CORTINA SYSTEMS INC |
| 元件分类： | 网络接口 |
| 英文描述： | DATACOM, ETHERNET TRANSCEIVER, PQFP64 |
| 封装： | LEAD FREE, LQFP-64 |
| 文件页数： | 42/116页 |
| 文件大小： | 1172K |
| 代理商： | WJLXT971ALE.A4SE000 |
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LXT971A 3.3V Dual-Speed Fast Ethernet Transceiver
Datasheet
31
Document #: 249414
Revision #: 002
Rev. Date: August 7, 2002
3.5
Establishing Link
See Figure 9 for an overview of link establishment.
3.5.1
Auto-Negotiation
If not configured for forced operation, the LXT971A attempts to auto-negotiate with its link
partner by sending Fast Link Pulse (FLP) bursts. Each burst consists of up to 33 link pulses spaced
62.5
s apart. Odd link pulses (clock pulses) are always present. Even link pulses (data pulses) may
be present or absent to indicate a “1” or a “0”. Each FLP burst exchanges 16 bits of data, which are
referred to as a “link code word”. All devices that support auto-negotiation must implement the
“Base Page” defined by IEEE 802.3 (registers 4 and 5). LXT971A also supports the optional “Next
Page” function as described in Tables 50 and 51 on page 80 (registers 7 and 8).
3.5.1.1
Base Page Exchange
By exchanging Base Pages, the LXT971A and its link partner communicate their capabilities to
each other. Both sides must receive at least three identical base pages for negotiation to continue.
Each side identifies the highest common capabilities that both sides support and configures itself
accordingly.
3.5.1.2
Next Page Exchange
Additional information, above that required by base page exchange is also sent via “Next Pages”.
The LXT971A fully supports the IEEE 802.3ab method of negotiation via Next Page exchange.
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 40
on page 70, must be exhausted before proceeding.
Set the Auto-Negotiation Advertisement Register bits.
Enable auto-negotiation (set MDIO Register bit 0.12 = 1).
3.5.2
Parallel Detection
For the parallel detection feature of auto-negotiation, the LXT971A 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 LXT971A
to communicate with devices that do not support auto-negotiation.
相关PDF资料 |
PDF描述 |
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| WJLXT971ALE.A4SE001 | DATACOM, ETHERNET TRANSCEIVER, PQFP64 |
| WJLXT971ALC.A4 | DATACOM, ETHERNET TRANSCEIVER, PQFP64 |
| WJLXT971ALE.A4 | DATACOM, ETHERNET TRANSCEIVER, PQFP64 |
| WJLXT971ALC.A4 | DATACOM, ETHERNET TRANSCEIVER, PQFP64 |
| WJLXT971ALE.A4 | DATACOM, ETHERNET TRANSCEIVER, PQFP64 |
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| WJLXT972ALC.A4-857345 | 功能描述:TXRX ETH 10/100 SGL PORT 64-LQFP RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:1 系列:- 类型:线路收发器 驱动器/接收器数:5/3 规程:RS232 电源电压:3 V ~ 5.5 V 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC 包装:Digi-Reel® 产品目录页面:918 (CN2011-ZH PDF) 其它名称:296-25096-6 |
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