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LAN8740A-EN-TR Datasheet(PDF) 7 Page - Microchip Technology |
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LAN8740A-EN-TR Datasheet(HTML) 7 Page - Microchip Technology |
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7 / 136 page  2013-2015 Microchip Technology Inc. DS00001987A-page 7 LAN8740A/LAN8740Ai TABLE 2-1: MII/RMII SIGNALS Num Pins Name Symbol Buffer Type Description 1 Transmit Data 0 TXD0 VIS The MAC transmits data to the transceiver using this signal in all modes. 1 Transmit Data 1 TXD1 VIS The MAC transmits data to the transceiver using this signal in all modes. 1 Transmit Data 2 (MII Mode) TXD2 VIS The MAC transmits data to the transceiver using this signal in MII mode. Note: This signal must be grounded in RMII mode. 1 Transmit Data 3 (MII Mode) TXD3 VIS The MAC transmits data to the transceiver using this signal in MII mode. Note: This signal must be grounded in RMII mode. 1 Interrupt Out- put nINT VOD8 (PU) Active low interrupt output. Place an external resis- tor pull-up to VDDIO. Note: The nINT signal can be optionally con- figured to output on the LED1 or LED2 pins. Refer to Section 3.6, "Interrupt Management" for additional details on device interrupts. Note: Refer to Section 3.8.1.6, "nINTSEL and LED2 Polarity Selection" for details on how the nINTSEL configuration strap is used to determine the function of this pin. Transmit Error (MII Mode) TXER VIS When driven high, the 4B/5B encode process sub- stitutes the Transmit Error code-group (/H/) for the encoded data word. This input is ignored in the 10BASE-T mode of operation. This signal is also used in EEE mode as TXER when TXEN = 1, and as LPI when TXEN = 0. Note: This signal is not used in RMII mode. Transmit Data 4 (MII Mode) TXD4 VIS (PU) In Symbol Interface (5B decoding) mode, this sig- nal becomes the MII Transmit Data 4 line (the MSB of the 5-bit symbol code-group). Note: This signal is not used in RMII mode. 1 Transmit Enable TXEN VIS (PD) Indicates that valid transmission data is present on TXD[3:0]. In RMII mode, only TXD[1:0] provide valid data. 1 Transmit Clock (MII Mode) TXCLK VO8 Used to latch data from the MAC into the trans- ceiver. • MII (100BASE-TX): 25 MHz • MII (10BASE-T): 2.5 MHz Note: This signal is not used in RMII mode. |
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