1. Overview:

️· Device: DM9620/DM9620I is a combined Ethernet/USB controller. It integrates both functions onto a single chip, providing a bridge between an Ethernet network and a USB host.
️· Key Features: It supports both 10/100 Ethernet and USB connectivity. It offers various configurable options (strap pins) that affect its operation (clock source, EEPROM type, header format, etc.).
️· Target Applications: Likely designed for embedded systems, devices requiring network connectivity and USB host capabilities (e.g., routers, industrial devices, IoT devices).

2. Pinout Summary (Most Important Section):

The datasheet provides a very detailed pinout. Here's a categorized summary of the major pin categories:

️· Power: Multiple VCC3 (3.3V) and GND pins for power supply.
️· Ethernet PHY Interface: (Crucial for Ethernet communication)
- RX+/RX-: Ethernet Receive Data.
- TX+/TX-: Ethernet Transmit Data.
- SD: Fiber Signal Detection.
- Various ground pins (RXGND, TXGND, BGRES, etc.)
️· USB Interface: VBUS_IN, WAKE, various control signals.
️· LED Indicators: Multiple LED pins (USB_LED, FDX_LED, SPD_LED, LNK_LED) for signaling status.
️· GPIO (General Purpose Input/Output): Multiple pins that can be configured as either inputs or outputs, allowing for flexible control of external devices. (Requires TEST1 pin set to 1.)
️· Strap Pins: These pins determine crucial configuration options. Significant strap pins include:
- TXD0, TXD1, TXD2, TXD3: Configure the Ethernet interface mode (MII, Reverse MII, RMII).
- TXD0: Select Ethernet RX packet header format.
- EECS: Select clock source (internal PLL or external crystal).
️· Reset and Test: RSTB (Hardware Reset), TEST1, TEST2.
️· EEPROM: Support for EEPROM with strap pin control.

3. Configuration Options (Strap Pins):

️· The strap pin settings significantly impact the chip's behavior. Understanding these settings is vital for proper integration.
️· The datasheet lists the function of each strap pin with details on what value (high or low) to set them to for specific configurations.

4. Other Key Points:

️· EEPROM Support: The chip can interact with an external EEPROM for storing configuration data.
️· Wake-on-LAN (WOL): Supports WOL functionality.
️· Test Modes: Includes test modes for debugging and validation.

In essence, this is a detailed technical document describing the pin assignments, functionality, and configuration options of a complex integrated Ethernet/USB controller chip. To effectively use this datasheet, you'll need to carefully review the specific requirements of your application and configure the strap pins accordingly.