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Chapter 2 Product Overview
8 Reference Manual LittleBoard 550
♦ Supports RS232, RS485, or RS422 operation on each port
♦ Supports programmable word length, stop bits, and parity
♦ Supports 16-bit programmable baud-rate generator and a interrupt generator.
• Parallel Port
♦ Supports standard printer port
♦ Supports IEEE standard 1284 protocols of EPP and ECP outputs
♦ Bi-directional data lines
♦ Supports 16 byte FIFO for ECP mode.
• USB Ports
♦ Supports two root USB hubs
♦ Supports up to four USB ports
♦ Supports USB bootable devices
♦ Supports USB v1.1 and Universal OHCI v1.1
♦ Supports over-current fuses on board
♦ Supports over-current detection status on board
• Keyboard/Mouse Interface
♦ Supports PS/2 keyboard
♦ Supports PS/2 mouse
• Audio interface
♦ Supports AC’97 standard
♦ AC’97 CODEC on board
♦ Audio amplifier on board
• Ethernet Interface
♦ Supports two fully independent Ethernet ports
♦ Integrated LEDs on each port (Link/Activity and Speed)
♦ Two Intel 82551ER Controller chips
♦ Supports IEEE 802.3 10BaseT/100BaseTX compatible physical layer
♦ Supports Auto-negotiation for speed, duplex mode, and flow control
♦ Supports full duplex or half-duplex mode
• Full-duplex mode supports transmit and receive frames simultaneously
• Supports IEEE 802.3x Flow control in full duplex mode
• Half-duplex mode supports enhance proprietary collision reduction mode