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    參數(shù)資料
    型號(hào): DJIXE972MECA4
    廠商: Intel Corp.
    英文描述: Single-Port 10/100 Mbps PHY Transceiver
    中文描述: 單端口10/100 Mbps的物理層收發(fā)器
    文件頁(yè)數(shù): 53/92頁(yè)
    文件大小: 666K
    代理商: DJIXE972MECA4
    Intel
    LXT972M Single-Port 10/100 Mbps PHY Transceiver
    Datasheet
    Document Number: 302875-005
    Revision Date: 27-Oct-2005
    53
    5.9.3
    LED Functions
    The LXT972M Transceiver has these direct LED driver pins: LED/CFG1, LED/CFG2, and LED/
    CFG3.
    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 (
    Table 54, “LED
    Configuration Register - Address 20, Hex 14” on page 87
    ) to indicate one of the following
    conditions:
    Collision Condition
    Duplex Mode
    Link Status
    Operating Speed
    Receive Activity
    Transmit Activity
    The LED drivers can also be programmed to display various combined status conditions. For
    example, setting Register bits 20.15:12 to ‘1101’ produces the following combination of Link and
    Activity indications:
    If Link is down, LED is off. If activity is detected from the MAC, the LED still blinks even if
    the link is down.
    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.
    For the LXT972M Transceiver, 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. For details, see the discussion of
    “Hardware Configuration Settings” on page 33
    .
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