参数资料
型号: WJLXT972ALC.A4
厂商: INTEL CORP
元件分类: 网络接口
英文描述: DATACOM, ETHERNET TRANSCEIVER, PQFP64
封装: ROHS COMPLIANT, LQFP-64
文件页数: 27/97页
文件大小: 1281K
代理商: WJLXT972ALC.A4
Intel
LXT972A Single-Port 10/100 Mbps PHY Transceiver
Datasheet
33
Document Number: 249186-004
Revision Date: 25-Oct-2005
5.4.1
MDIO Control Mode and Hardware Control Mode
In the MDIO Control mode, the LXT972A Transceiver reads the Hardware Control Interface pins
to set the initial (default) values of the MDIO registers. Once the initial values are set, bit control
reverts to the MDIO interface.
The following modes are available using either Hardware Control or MDIO control:
Force network link operation to:
— 100BASE-TX, Full-Duplex
— 100BASE-TX, Half-Duplex
— 10BASE-T, Full-Duplex
— 10BASE-T, Half-Duplex
Allow auto-negotiation/parallel-detection
In the Hardware Control Mode, the LXT972A Transceiver disables direct-write operations to the
MDIO registers through the MDIO Interface. On power-up or hardware reset, the LXT972A
Transceiver reads the Hardware Control Interface pins and sets the MDIO registers accordingly.
When the network link is forced to a specific configuration, the LXT972A Transceiver
immediately begins operating the network interface as commanded. When auto-negotiation is
enabled, the LXT972A Transceiver begins the auto-negotiation/parallel-detection operation.
5.4.2
Reduced-Power Modes
This section discusses the LXT972A Transceiver reduced-power modes.
5.4.2.1
Hardware Power Down
The hardware power-down mode is controlled by the PWRDWN pin. When PWRDWN is High,
the following conditions are true:
The LXT972A Transceiver network port and clock are shut down.
All outputs are tristated.
All weak pad pull-up and pull-down resistors are disabled.
The MDIO registers are not accessible.
5.4.2.2
Software Power Down
Software power-down control is provided by Register bit 0.11 in the Control Register. (See
Table 41 on page 79.) During soft power-down, the following conditions are true:
The network port is shut down.
The MDIO registers remain accessible.
相关PDF资料
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WJLXT972ALC.A4 DATACOM, ETHERNET TRANSCEIVER, PQFP64
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