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LAN8187 Datasheet(PDF) 12 Page - SMSC Corporation |
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LAN8187 Datasheet(HTML) 12 Page - SMSC Corporation |
12 / 72 page ±15kV ESD Protected MII/RMII Fast-Ethernet PHY with HP Auto-MDIX and SMSC flexPWRTM Datasheet SMSC LAN8187/LAN8187I 12 Revision 1.0 (12-14-06) DATASHEET Chapter 3 Pin Description This chapter describes the signals on each pin. When a lower case “n” is used at the beginning of the signal name, it indicates that the signal is active low. For example, nRST indicates that the reset signal is active low. 3.1 I/O Signals I Input. Digital LVCMOS levels. O Output. Digital LVCMOS levels. I/O Input or Output. Digital LVCMOS levels. Note: The digital signals are not 5V tolerant. They are variable voltage from +1.6V to +3.6V. AI Input. Analog levels. AO Output. Analog levels. Table 3.1 MII Signals SIGNAL NAME TYPE DESCRIPTION TXD0 I Transmit Data 0: Bit 0 of the 4 data bits that are accepted by the PHY for transmission. TXD1 I Transmit Data 1: Bit 1 of the 4 data bits that are accepted by the PHY for transmission. TXD2 I Transmit Data 2: Bit 2 of the 4 data bits that are accepted by the PHY for transmission Note: This signal should be grounded in RMII Mode. TXD3 I Transmit Data 3: Bit 3 of the 4 data bits that are accepted by the PHY for transmission. Note: This signal should be grounded in RMII Mode nINT/ TX_ER/ TXD4 I/O MII Transmit Error: When driven high, the 4B/5B encode process substitutes the Transmit Error code-group (/H/) for the encoded data word. This input is ignored in 10Base-T operation. MII Transmit Data 4: In Symbol Interface (5B Decoding) mode, this signal becomes the MII Transmit Data 4 line, the MSB of the 5-bit symbol code-group. Notes: This signal is not used in RMII Mode. This signal is mux’d with nINT See Section 4.10, "(TX_ER/TXD4)/nINT Strapping," on page 31 for additional information on configuration/strapping options. TX_EN I Transmit Enable: Indicates that valid data is presented on the TXD[3:0] signals, for transmission. In RMII Mode, only TXD[1:0] have valid data. TX_CLK O Transmit Clock: 25MHz in 100Base-TX mode. 2.5MHz in 10Base-T mode. Note: This signal is not used in RMII Mode |
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