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LAN9252/ML 数据表(PDF) 10 Page - Microchip Technology |
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LAN9252/ML 数据表(HTML) 10 Page - Microchip Technology |
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10 / 329 page  LAN9252 DS00001909A-page 10 2015 Microchip Technology Inc. Microcontroller Mode: The LAN9252 communicates with the microcontroller through an SRAM-like slave interface. The simple, yet highly functional host bus interface provides a glue-less connection to most common 8 or 16-bit micro- processors and microcontrollers as well as 32-bit microprocessors with an 8 or 16-bit external bus. Alternatively, the device can be accessed via SPI or Quad SPI, while also providing up to 16 inputs or outputs for general purpose usage. Expansion Mode: While the device is in SPI or Quad SPI mode, a third networking port can be enabled to provide an additional MII port. This port can be connected to an external PHY, to enable star or tree network topologies, or to another LAN9252 to create a four port solution. This port can be configured for the upstream or downstream direction. Digital I/O Mode: For simple digital modules without microcontrollers, the LAN9252 can operate in Digital I/O Mode where 16 digital signals can be controlled or monitored by the EtherCAT master. Six control signals are also provided. Figure 2-3 provides a system level overview of each mode of operation. FIGURE 2-3: MODES OF OPERATION LAN9252 Microprocessor/ Microcontroller SPI / Quad SPI LAN9252 Microprocessor/ Microcontroller Host Bus Interface Magnetics or Fiber Xcvr RJ45 or Fiber Magnetics or Fiber Xcvr RJ45 or Fiber Magnetics or Fiber Xcvr RJ45 or Fiber Magnetics or Fiber Xcvr RJ45 or Fiber Microcontroller Mode (via Host Bus Interface) Microcontroller Mode (via SPI) Digital I/Os LAN9252 PHY MII LAN9252 Magnetics or Fiber Xcvr RJ45 or Fiber Magnetics or Fiber Xcvr RJ45 or Fiber Magnetics or Fiber Xcvr RJ45 or Fiber Magnetics or Fiber Xcvr RJ45 or Fiber Magnetics or Fiber Xcvr Digital I/O Mode Expansion Mode GPIOs Microprocessor/ Microcontroller SPI / Quad SPI RJ45 or Fiber |
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