SLVUDI2 September   2025

 

  1.   1
  2.   Description
  3.   Get Started
  4.   Features
  5.   5
  6. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  7. 2Hardware
    1. 2.1 Board Overview
    2. 2.2 Key Features
      1. 2.2.1 Processor
      2. 2.2.2 Memory and Storage
      3. 2.2.3 Interface and Peripherals
      4. 2.2.4 Expansion Connectors and Expansion Headers to Support Application-Specific Capes
    3. 2.3 Power Requirements
      1. 2.3.1 Integrated Power Architecture
      2. 2.3.2 Advanced Power Management Features
    4. 2.4 Header Information
      1. 2.4.1 Cape Expansion Headers
      2. 2.4.2 65 Possible Digital I/Os
      3. 2.4.3 PWMs and Timers
      4. 2.4.4 Analog Inputs
      5. 2.4.5 UART
      6. 2.4.6 I2C
      7. 2.4.7 SPI
    5. 2.5 Detailed Hardware Design
      1. 2.5.1 USB Interface
        1. 2.5.1.1 USB 2.0 Type-A Interface
        2. 2.5.1.2 USB 2.0 Type-C® Interface
      2. 2.5.2 Ethernet Interface
      3. 2.5.3 Power Supply Interface
      4. 2.5.4 DDR3L SDRAM Interface
      5. 2.5.5 eMMC Flash Interface
      6. 2.5.6 Micro SD Card Slot Interface
      7. 2.5.7 Grove Connector Interfaces
        1. 2.5.7.1 Grove I2C Interface (J4)
        2. 2.5.7.2 Grove UART Interface (J5)
  8. 3Hardware Design Files
    1. 3.1 Schematics, PCB Layout and BOM
  9. 4Compliance Information
    1. 4.1 Compliance – FCC Requirement
  10. 5Additional Information
    1. 5.1 Known Hardware or Software Issues
    2. 5.2 Trademarks
    3. 5.3 Brand Uses Approval
  11. 6Related Documentation

2.5.5 eMMC Flash Interface

BeagleBone Green Eco incorporates a 16GB Kingston EMMC16G-WW28 eMMC storage device, providing non-volatile memory for the operating system and user data. The eMMC connects to the AM335x processor through an 8-bit data bus and operates at speeds up to 52MHz in high-speed mode.

This embedded storage serves as the primary boot device and storage medium for the board, holding the operating system, application software, and user files. The eMMC interface uses a direct connection scheme with command, clock, and data lines routed to the processor with series resistors to control signal integrity at higher transfer speeds.

The eMMC storage is powered by the 3.3V supply rail and includes a comprehensive decoupling capacitor network to provide stable operation during intensive read and write operations. A hardware reset signal allows the processor to initialize the eMMC device during boot sequences, with a pullup resistor maintaining a known state during power-up.

The eMMC appears to the operating system as a standard block storage device, similar to a hard drive or SSD. This enables developers to use standard file systems and storage access methods without specific knowledge of the underlying storage technology. For users requiring additional storage space, the board also supports microSD cards through a dedicated connector.

The use of eMMC technology provides several advantages over raw NAND flash, including built-in wear leveling, bad block management, and error correction, resulting in improved reliability and longer service life for the storage system.

BEAGL-BONE-GRN-ECO eMMC Flash Interface Block Diagram Figure 2-8 eMMC Flash Interface Block Diagram