參數(shù)資料
型號(hào)： LXT971A
廠商： Intel Corp.
英文描述： 3.3V Dual-Speed Fast Ethernet PHY Transceiver
中文描述： 3.3雙速快速以太網(wǎng)物理層收發(fā)器
文件頁(yè)數(shù)： 45/90頁(yè)
文件大?。?/td> 568K
代理商： LXT971A
LXT971A 3.3V Dual-Speed Fast Ethernet Transceiver
Datasheet
Document #: 249414
Revision #: 002
Rev. Date: August 7, 2002
45
Register bits 17.14 and 17.9 can be used to determine the link operating conditions (speed and
duplex).
3.9.1.1
Monitoring Next Page Exchange
The LXT971A offers an Alternate Next Page mode to simplify the next page exchange process.
Normally, Register bit 6.1 (Page Received) remains set until read. When Alternate Next Page mode
is enabled Register bit 6.1 is automatically cleared whenever a new negotiation process takes place.
This prevents the user from reading an old value in 6.1 and assuming that Registers 5 and 8
(Partner Ability) contain valid information. Additionally, the LXT971A uses Register bit 6.5 to
indicate when the current received page is the base page. This information is useful for recognizing
when next pages must be resent due to a new negotiation process starting. Register bits 6.1 and 6.5
are cleared when read.
3.9.2
LED Functions
The LXT971A incorporates three direct LED drivers. On power up all the drivers are asserted for
approximately 1 second after reset de-asserts. Each LED driver can be programmed using the LED
Configuration Register (refer to
Table 56 on page 85
) to indicate one of the following conditions:
Operating Speed
Transmit Activity
Receive Activity
Collision Condition
Link Status
Duplex Mode
The LED drivers can also be programmed to display various combined status conditions. For
example, setting Register bits 20.15:12 = 1101 produces the following combination of Link and
Activity indications:
If Link is down LED is off.
If Link is up LED is on.
If Link is up and activity is detected, the LED blinks at the stretch interval selected by Register
bits 20.3:2 and continues to blink as long as activity is present.
The LED driver pins also provide initial configuration settings. The LED pins are sensitive to
polarity and automatically pull up or pull down to configure for either open drain or open collector
circuits (10 mA Max current rating) as required by the hardware configuration. Refer to the
discussion of
“Hardware Configuration Settings” on page 30
for details.
3.9.2.1
LED Pulse Stretching
The LED Configuration Register also provides optional LED pulse stretching to 30, 60, or 100 ms.
The pulse stretch time is further extended if the event occurs again during this pulse stretch period.
When an event such as receiving a packet occurs it is edge detected and it starts the stretch timer.
The LED driver remains asserted until the stretch timer expires. If another event occurs before the
stretch timer expires then the stretch timer is reset and the stretch time is extended.
相關(guān)PDF資料
PDF描述
LXT972A 3.3V Dual-Speed Fast Ethernet Transceiver Datasheet
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LXT972M Single-Port 10/100 Mbps PHY Transceiver
LXT9763 Fast Ethernet 10/100 Hex Transceiver with Full MII
LXT9763HC LAN TRANSCEIVER|HEX|QFP|208PIN|PLASTIC
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LXT971ABC 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LAN TRANSCEIVER|SINGLE|CMOS|BGA|64PIN|PLASTIC
LXT971ABE 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:3.3V Dual-Speed Fast Ethernet PHY Transceiver
LXT971ALC 制造商:Intel 功能描述:LAN Transceiver, Single, 64 Pin, Plastic, QFP 制造商:Intellon Corporation 功能描述:LAN Transceiver, Single, 64 Pin, Plastic, QFP 制造商:Level One 功能描述:LAN Transceiver, Single, 64 Pin, Plastic, QFP
LXT971ALE 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:3.3V Dual-Speed Fast Ethernet PHY Transceiver
LXT971LC 制造商:Intel 功能描述:
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