Overview
The DP83848J-MAU-EK is an evaluation kit designed by Texas Instruments to facilitate the development and evaluation of the DP83848J Media Attachment Unit (MAU) chip. This kit is intended to help customers quickly design and market systems incorporating the DP83848J chip. It provides a comprehensive platform for evaluating the key features and performance of the DP83848J in various Ethernet applications.
Key Specifications
| Specification | Description |
|---|---|
| Operating Supply Voltage | 3.3V (can be supplied via MII connector or external 3.3V via jumper J10) |
| Interface Type | MII (Media Independent Interface), RJ-45 with integrated magnetics |
| PHY Addresses | Default: 01h, Optional: 03h (set by resistor R29) |
| LED Configuration | Link and Speed LEDs; configurable via resistors R30 and R31 |
| Auto-MDIX | Configurable via resistor R30 |
| Board Size | 2.05 inches (height), 1.5 inches (length), 4 layers |
| PCB Material | FR4 material |
| Differential Impedance | 100 ohms, +/- 5% |
Key Features
- Integrated magnetics and RJ-45 connector for network connection
- MII interface and MDIO connection for configuration and diagnostics
- On-board clock using a crystal oscillator
- Compact and low-cost design with double-sided component placement
- Configurable LED settings for link and activity indicators
- Auto-MDIX capability for automatic crossover detection
- No device-specific software required; supports Integrity utility for diagnostics and configuration
Applications
The DP83848J-MAU-EK is designed for use in any customer equipment that provides a standard IEEE 802.3, Clause 22 MII DTE interface. This includes but is not limited to:
- SmartBits/Netcom boxes and other network testing equipment
- Embedded systems requiring Ethernet connectivity
- Industrial and commercial Ethernet applications where a compact, low-cost PHY solution is needed
Q & A
- What is the primary purpose of the DP83848J-MAU-EK evaluation kit?
The primary purpose is to provide a platform for customers to evaluate and design systems using the DP83848J chip quickly and efficiently.
- What are the power supply options for the DP83848J MAU?
The DP83848J MAU can be powered via the MII connector or an external 3.3V power supply through jumper J10.
- How is the PHY address set on the DP83848J MAU board?
The PHY address is set by resistor R29; the default is 01h, and it can be set to 03h by stuffing resistor R29.
- What is the function of the Auto-MDIX feature on the DP83848J MAU?
The Auto-MDIX feature allows for automatic crossover detection and can be enabled or disabled via resistor R30.
- What type of LEDs are provided on the DP83848J MAU board?
The board includes LEDs for link and speed indicators, which can be configured via resistors R30 and R31.
- Does the DP83848J MAU require any specific software for operation?
No device-specific software is required, but the Integrity utility provided by National Semiconductor can be used for diagnostics and configuration.
- What are the key interfaces provided on the DP83848J MAU board?
The board includes MII and MDIO interfaces, as well as an RJ-45 connector with integrated magnetics.
- What are the PCB layout considerations for the DP83848J MAU board?
The board is designed with FR4 material, trace symmetry, differential impedance of 100 ohms, and other considerations to minimize cross-talk and EMI.
- What is the size and layer configuration of the DP83848J MAU board?
The board is 2.05 inches in height, 1.5 inches in length, and has a 4-layer configuration.
- Can the DP83848J MAU board be used in safety-critical applications?
No, the DP83848J MAU is not authorized for use in safety-critical applications such as life support systems where failure could cause severe personal injury or death.
