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DP83848C Datasheet(PDF) 13 Page - National Semiconductor (TI) |
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DP83848C Datasheet(HTML) 13 Page - National Semiconductor (TI) |
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13 / 82 page  13 www.national.com 1.6 Strap Options (Continued) AN_EN (LED_ACT/COL) AN_1 (LED_SPEED) AN_0 (LED_LINK) S, O, PU 26 27 28 Auto-Negotiation Enable: When high, this enables Auto-Negoti- ation with the capability set by ANO 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 DP83848C 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. The value set at this input is latched into the DP83848C 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 111 since these pins have internal pull-ups. MII_MODE (RX_DV) SNI_MODE (TXD_3) S, O, PD 39 6 MII MODE SELECT: This strapping option pair determines the operating mode of the MAC Data Interface. Default operation (No pull-ups) will enable normal MII Mode of operation. Strapping MII_MODE high will cause the device to be in RMII or SNI mode of operation, determined by the status of the SNI_MODE strap. Since the pins include internal pull-downs, the default values are 0. The following table details the configurations: LED_CFG (CRS) S, O, PU 40 LED CONFIGURATION: This strapping option determines the mode of operation of the LED pins. Default is Mode 1. Mode 1 and Mode 2 can be controlled via the strap option. All modes are con- figurable via register access. SeeTable 3 for LED Mode Selection. MDIX_EN (RX_ER) S, O, PU 41 MDIX ENABLE: Default is to enable MDIX. This strapping option disables Auto-MDIX. An external pull-down will disable Auto- MDIX mode. Signal Name Type Pin # Description AN_EN AN1 AN0 Forced Mode 0 0 0 10BASE-T, Half-Duplex 0 0 1 10BASE-T, Full-Duplex 0 1 0 100BASE-TX, Half-Duplex 0 1 1 100BASE-TX, Full-Duplex AN_EN AN1 AN0 Advertised Mode 1 0 0 10BASE-T, Half/Full-Duplex 1 0 1 100BASE-TX, Half/Full-Duplex 1 1 0 10BASE-T Half-Duplex 100BASE-TX, Half-Duplex 1 1 1 10BASE-T, Half/Full-Duplex 100BASE-TX, Half/Full-Duplex MII_MODE SNI_MODE MAC Interface Mode 0 X MII Mode 1 0 RMII Mode 1 1 10 Mb SNI Mode |
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