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LAN8720AI Datasheet(PDF) 11 Page - SMSC Corporation |
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LAN8720AI Datasheet(HTML) 11 Page - SMSC Corporation |
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11 / 79 page  Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support Datasheet SMSC LAN8720A/LAN8720Ai 11 Revision 1.4 (08-23-12) DATASHEET Note 2.1 Configuration strap values are latched on power-on reset and system reset. Configuration straps are identified by an underlined symbol name. Signals that function as configuration straps must be augmented with an external resistor when connected to a load. Refer to Section 3.7, "Configuration Straps," on page 31 for additional information. 1 Carrier Sense / Receive Data Valid CRS_DV VO8 This signal is asserted to indicate the receive medium is non-idle. When a 10BASE-T packet is received, CRS_DV is asserted, but RXD[1:0] is held low until the SFD byte (10101011) is received. Note: Per the RMII standard, transmitted data is not looped back onto the receive data pins in 10BASE-T half-duplex mode. PHY Operating Mode 2 Configuration Strap MODE2 VIS (PU) Combined with MODE0 and MODE1, this configuration strap sets the default PHY mode. See Note 2.1 for more information on configuration straps. Note: Refer to Section 3.7.2, "MODE[2:0]: Mode Configuration," on page 31 for additional details. Table 2.2 LED Pins NUM PINS NAME SYMBOL BUFFER TYPE DESCRIPTION 1 LED 1 LED1 O12 Link activity LED Indication. This pin is driven active when a valid link is detected and blinks when activity is detected. Note: Refer to Section 3.8.1, "LEDs," on page 37 for additional LED information. Regulator Off Configuration Strap REGOFF IS (PD) This configuration strap is used to disable the internal 1.2V regulator. When the regulator is disabled, external 1.2V must be supplied to VDDCR. When REGOFF is pulled high to VDD2A with an external resistor, the internal regulator is disabled. When REGOFF is floating or pulled low, the internal regulator is enabled (default). See Note 2.2 for more information on configuration straps. Note: Refer to Section 3.7.3, "REGOFF: Internal +1.2V Regulator Configuration," on page 32 for additional details. Table 2.1 RMII Signals (continued) NUM PINS NAME SYMBOL BUFFER TYPE DESCRIPTION |
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