参数资料
型号: WJLXT972ALC.A4SE001
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: 17/100页
文件大小: 1046K
代理商: WJLXT972ALC.A4SE001
LXT972A 3.3 V Dual-Speed Fast Ethernet Transceiver
Datasheet
23
Document #: 249186
Revision #: 003
Rev. Date: August 7, 2002
3.4.3
Reduced Power Modes
The LXT972A offers two power-down modes.
3.4.3.1
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 network port and clock are shut down.
All outputs are three-stated.
All weak pad pull-up and pull-down resistors are disabled.
The MDIO registers are not accessible.
Figure 6. Initialization Sequence
MDDIS Voltage
Level?
High
Low
MDIO Control
Mode
Hardware Control
Mode
Disable MDIO Read and
Write Operations
Reset MDIO Registers to
values read at H/W
Control Interface at last
Hardware Reset
MDIO Controlled Operation
(MDIO Writes Enabled)
Power-up or Reset
Initialize MDIO Registers
Read H/W Control
Interface
Software
Reset?
Yes
No
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