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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LAN8740 датащи(PDF) 28 Page - Microchip Technology |
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LAN8740 датащи(HTML) 28 Page - Microchip Technology |
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28 / 136 page  LAN8740A/LAN8740Ai DS00001987A-page 28 2013-2015 Microchip Technology Inc. 3.4.3 MII VS. RMII CONFIGURATION The device must be configured to support the MII or RMII bus for connectivity to the MAC. This configuration is done via the RMIISEL configuration strap. MII or RMII mode selection is configured based on the strapping of the RMIISEL configuration strap as described in Section 3.7.3, "RMIISEL: MII/RMII Mode Configuration". Additionally, the MII/RMII interface can be disabled (outputs driven low) via the Interface Disable bit of the Wakeup Control and Status Register (WUCSR). Most of the MII and RMII pins are multiplexed. Table 3-2, "MII/RMII Signal Mapping" describes the relationship of the related device pins to the MII and RMII mode signal names. Note 1: The RXER signal is optional on the RMII bus. This signal is required by the transceiver, but it is optional for the MAC. The MAC can choose to ignore or not use this signal. 2: In RMII mode, this pin needs to be tied to VSS. TABLE 3-2: MII/RMII SIGNAL MAPPING Pin Name MII Mode RMII Mode TXD0 TXD0 TXD0 TXD1 TXD1 TXD1 TXEN TXEN TXEN RXER/ RXD4/PHYAD0 RXER RXER (see Note 1) COL/CRS_DV/MODE2 COL CRS_DV RXD0/MODE0 RXD0 RXD0 RXD1/MODE1 RXD1 RXD1 TXD2 TXD2 (see Note 2) TXD3 TXD3 (see Note 2) nINT/TXER/TXD4 TXER/ TXD4 CRS CRS RXDV RXDV RXD2/RMIISEL RXD2 RXD3/PHYAD2 RXD3 TXCLK TXCLK RXCLK/PHYAD1 RXCLK XTAL1/CLKIN XTAL1/CLKIN REF_CLK |
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