The DM9621A USB to 10/100Mbps Fast Ethernet controller is a high performance and highly integrated ASIC with embedded SSRAM for packet buffering. It enables low cost and affordable Fast Ethernet network connection to desktop, notebook PC, and embedded system using popular USB ports. It has an USB interface to communicate with USB host controller and is compliant with USB specification V1.0, V1.1 and V2.0. It implements 10/100Mbps Ethernet LAN function based on IEEE802.3, and IEEE802.3u standards. DM9621A integrates an on-chip 10/100Mbps Ethernet PHY to simplify system design and provides an optional Reduce media-independent interface (RMII).

USB Interface

• USB2.0 Device
• Support 12Mbps full speed operation
• Support 480Mbps high speed operation
• Support suspend mode and remote wake-up resume
• Support USB standard commands
• Support vendor specific commands
• Efficient TX/RX FIFO auto management.
• Embedded SRAM for RX/TX packet buffering
• Supports 4 endpoints (Control, Interrupt, Bulk_IN, Bulk_OUT)
• Supported Classes：USB Common Class / USB Communications Class

Ethernet

• Support IEEE802.3u 100BASE-TX and with IEEE802.3 10BASE-T standards
• Support IEEE802.3x flow control function for 100BASE-TX and 10BASE-T.
• Support IEEE 802.3az Energy Efficient Ethernet (EEE)
• Built-in 10/100Mbps Fast-Ethernet PHY with Auto-MDIX
• Supports RMII interface or 8 pins GPIO
• Support Auto-Negotiation function
• Back Pressure Mode for Half-Duplex mode flow Control
• PAUSE frame for Full-Duplex flow control
• Support Power management: Wake-on-LAN, ARP/NDP Offload
• Supports GPIO, wakeup frame, link status change and Magic packet events for remote wake-up
• Support TCP / UDP / IPv4 checksum offload checking and generating

EEPROM Interface

• Support 128/256/512 bytes (93C46/93C56/93C66) of serial EEPROM (for storing USB Descriptors)
• 93C06/93C46/93C56/93C66 Auto Detection

LED Indications

• Ethernet – Link / Act indication
• Ethernet – Speed (10M / 100M) indication
• USB speed indication (full / high speed + traffic modes)

Clock

• Single 25MHz / 30 ppm crystal or oscillator
• Optional 12MHz crystal for USB

Power Input

• Low-Power, Single-Supply 3.3V, 0.18um CMOS technology
• Built in 3.3V to 1.8V regulator

Miscellaneous

• Very low power consumption in suspend mode
• Power Reduced Mode (cable detection), and Power Down Mode
• Compatible with 5.0V tolerant I/O