General Description
The DM9000A is a fully integrated and cost-effective low pin count single chip Fast Ethernet controller with a general processor interface, a 10/100M PHY and 4K Dword SRAM. It is designed with low power and high performance process that support 3.3V with 5V IO tolerance.

FEATUREs
■48-pin LQFP
■  Supports processor interface: byte/word of I/O command to internal memory data operation
■Integrated 10/100M transceiver with HP Auto-MDIX
■ Supports back pressure mode for half-duplex mode flow control
■ IEEE802.3x flow control for full-duplex mode
■ Supports wakeup frame, link status change and magic packet events for remote wake up
■ Support 100M Fiber interface.
■ Integrated 16K Byte SRAM
■ Build in 3.3V to 2.5V regulator
■Supports early Transmit
■ Supports IP/TCP/UDP checksum generation and checking
■ Supports automatically load vendor ID and  product ID from EEPROM 
■Optional EEPROM configuration
■Very low power consumption mode:
   –  Power reduced mode (cable detection)
   – Power down mode
   –  Selectable TX drivers for 1:1 or 1.25:1 transformers for additional power reduction. 
■  Compatible with 3.3V and 5.0V tolerant I/O