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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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DP83849IF bảng dữ liệu(PDF) 14 Page - National Semiconductor (TI) |
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DP83849IF bảng dữ liệu(HTML) 14 Page - National Semiconductor (TI) |
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14 / 108 page  14 www.national.com 1.7 Strap Options (Continued) FX_EN_A (COL_A) FX_EN_B (COL_B) AN_EN (LED_ACT/LED_COL_A) AN1_A (LED_SPEED_A) AN0_A (LED_LINK_A) AN_EN (LED_ACT/LED_COL_B) AN1_B (LED_SPEED_B) AN0_B (LED_LINK_B) S, I, PD S, O, PU 3 59 21 20 19 41 42 43 FX ENABLE: Default is to disable 100BASE-FX (Fiber) mode. This strapping option enables 100BASE-FX. An external pull-up will enable 100BASE-FX mode. Auto-Negotiation Enable: When high, this enables Auto-Negoti- ation with the capability set by AN0 and AN1 pins. When low, this puts the part into Forced Mode with the capability set by AN0 and AN1 pins. AN0 / AN1: These input pins control the forced or advertised op- erating mode of the DP83849IF according to the following table. The value on these pins is set by connecting the input pins to GND (0) or VCC (1) through 2.2 kΩ resistors. These pins should NEVER be connected directly to GND or VCC. Fiber Mode Duplex Selection: If Fiber mode is strapped using the FX_EN pin, the AN0 strap value is used to select Half or Full Duplex. AN_EN and AN1are ignored if FX_EN is asserted, since Fiber mode is 100Mb only and does not support Auto-Negotiation. The value set at this input is latched into the DP83849IF at Hard- ware-Reset. The float/pull-down status of these pins are latched into the Basic Mode Control Register and the Auto_Negotiation Advertisement Register during Hardware-Reset. The default is 0111 since the FX_EN pin has an internal pull-down and the Auto-Negotiation pins have internal pull-ups. Signal Name Type Pin # Description FX_EN AN_EN AN1 AN0 Forced Mode 0 0 0 0 10BASE-T, Half-Duplex 0 0 0 1 10BASE-T, Full-Duplex 0 0 1 0 100BASE-TX, Half-Duplex 0 0 1 1 100BASE-TX, Full-Duplex 1 X X 0 100BASE-FX, Half-Duplex 1 X X 1 100BASE-FX, Full-Duplex FX_EN AN_EN AN1 AN0 Advertised Mode 0 1 0 0 10BASE-T, Half/Full-Duplex 0 1 0 1 100BASE-TX, Half/Full-Duplex 0 1 1 0 10BASE-T Half-Duplex 100BASE-TX, Half-Duplex 0 1 1 1 10BASE-T, Half/Full-Duplex 100BASE-TX, Half/Full-Duplex |
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