SPRAD05B May   2023  – December 2023 AM620-Q1 , AM623 , AM625 , AM625-Q1 , AM625SIP

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1 Introduction
    1. 1.1 Before Getting Started With the Board Design
    2. 1.2 Processor Selection
      1. 1.2.1 Note on AM625SIP Data Sheet
      2. 1.2.2 AM625 and AM625SIP Board Design Compatibility
    3. 1.3 Technical Documentation
    4. 1.4 Design Documentation
  5. 2 Block Diagram
    1. 2.1 Constructing the Block Diagram
    2. 2.2 Selecting the Boot Mode
    3. 2.3 Confirming Pinmux (Multiplexing Compatibility)
  6. 3 Power Supply
    1. 3.1 Power Supply Architecture
      1. 3.1.1 Integrated Power
      2. 3.1.2 Discrete Power
    2. 3.2 Power (Supply) Rails
      1. 3.2.1 Core Supply
      2. 3.2.2 Peripheral Power Supply
      3. 3.2.3 DDR PHY and SDRAM Power Supply
        1. 3.2.3.1 AM625 / AM623 / AM625-Q1 / AM620-Q1
        2. 3.2.3.2 AM625SIP
      4. 3.2.4 Internal LDOs for IO Groups (Processor IO Groups)
      5. 3.2.5 Dual-Voltage IOs (Processor IOs)
      6. 3.2.6 Dual-Voltage Dynamic Switching IOs
      7. 3.2.7 VPP (eFuse ROM programming supply)
    3. 3.3 Determining Board Power Requirements
    4. 3.4 Power Supply Filters
    5. 3.5 Power Supply Decoupling and Bulk Capacitors
      1. 3.5.1 AM625 / AM623 / AM625-Q1 / AM620-Q1
      2. 3.5.2 AM625SIP
      3. 3.5.3 Note on PDN target impedance
    6. 3.6 Power Supply Sequencing
    7. 3.7 Supply Diagnostics
    8. 3.8 Power Supply Monitoring
  7. 4 Clocking
    1. 4.1 Processor Clock Inputs
      1. 4.1.1 Unused WKUP_LFOSC0
      2. 4.1.2 LVCMOS Digital Clock Source
      3. 4.1.3 Crystal Selection
    2. 4.2 Clock Outputs
  8. 5 JTAG (Joint Test Action Group)
    1. 5.1 JTAG / Emulation
      1. 5.1.1 Configuration of JTAG / Emulation
        1. 5.1.1.1 AM625 / AM623
        2. 5.1.1.2 AM625-Q1 / AM620-Q1
        3. 5.1.1.3 AM625SIP
      2. 5.1.2 Implementation of JTAG / Emulation
      3. 5.1.3 Connection of JTAG Interface Signals
  9. 6 Configuration (Processor) and Initialization (Processor and Device)
    1. 6.1 Processor Reset
    2. 6.2 Latching of Boot Mode Configuration
    3. 6.3 Resetting the Attached Devices
    4. 6.4 Watchdog Timer
  10. 7 Processor Peripherals
    1. 7.1  Selecting Peripherals Across Domains
    2. 7.2  Memory (DDRSS)
      1. 7.2.1 AM625 / AM623 / AM625-Q1 / AM620-Q1
        1. 7.2.1.1 Processor DDR Subsystem and Device Register Configuration
        2. 7.2.1.2 Calibration Resistor Connection
      2. 7.2.2 AM625SIP
        1. 7.2.2.1 Reassigned DDRSS0 Pins on the AMK Package
        2. 7.2.2.2 Calibration Resistors Connection
    3. 7.3  Media and Data Storage Interfaces
    4. 7.4  Ethernet Interface Using Common Platform Ethernet Switch 3-port Gigabit (CPSW3G)
    5. 7.5  Programmable Real-Time Unit Subsystem (PRUSS)
    6. 7.6  Universal Serial Bus (USB) Subsystem
    7. 7.7  General Connectivity Peripherals
    8. 7.8  Display Subsystem (DSS)
      1. 7.8.1 AM625 / AM623 / AM625SIP / AM625-Q1
      2. 7.8.2 AM620-Q1
    9. 7.9  Camera Subsystem (CSI)
    10. 7.10 Connection of Processor Power Pins, Unused Peripherals and IOs
      1. 7.10.1 AM625 / AM623 / AM625-Q1 / AM620-Q1
      2. 7.10.2 AM625SIP
      3. 7.10.3 External Interrupt (EXTINTn)
      4. 7.10.4 Reserved Pins (Signals)
  11. 8 Interfacing of Processor IOs ( LVCMOS or Open-Drain or Fail-Safe Type IO Buffers) and Simulations
    1. 8.1 AM625 / AM623
    2. 8.2 AM625-Q1 / AM620-Q1
    3. 8.3 AM625SIP
  12. 9 Power Consumption and Thermal Analysis
    1. 9.1 Power Consumption
    2. 9.2 Maximum Current for Different Supply Rails
    3. 9.3 Power Modes
    4. 9.4 Thermal Design Guidelines
      1. 9.4.1 AM625 / AM623
      2. 9.4.2 AM625-Q1 / AM620-Q1
      3. 9.4.3 AM625SIP
  13. 10Schematic Design, Capture and Review
    1. 10.1 Selection of Components and Values
    2. 10.2 Schematic Design and Capture
    3. 10.3 Schematics Review
  14. 11Floor Planning, Layout, Routing Guidelines, Board Layers and Simulation
    1. 11.1 Escape Routing for PCB Design
    2. 11.2 DDR Design and Layout Guidelines
      1. 11.2.1 AM625 / AM623 / AM625-Q1 / AM620-Q1
      2. 11.2.2 AM625SIP
    3. 11.3 High-Speed Differential Signal Routing Guidelines
    4. 11.4 Board Layer Count and Stack-up
      1. 11.4.1 AM625 / AM623 / AM625-Q1 / AM620-Q1
      2. 11.4.2 AM625SIP
      3. 11.4.3 Simulation Recommendations
    5. 11.5 Reference for the Steps to be Followed for Running Simulation
  15. 12Device Handling and Assembly
    1. 12.1 Soldering Recommendations
      1. 12.1.1 Additional References
  16. 13References
    1. 13.1 AM625SIP
    2. 13.2 AM625 / AM623
    3. 13.3 AM625-Q1 / AM620-Q1
    4. 13.4 AM625 / AM623 / AM625-Q1 / AM620-Q1
    5. 13.5 Common for all AM62x family of processors
  17. 14Terminology
  18. 15Revision History

6.3 Resetting the Attached Devices

Recommended approach to implement the attached device reset is by using AND gate logic for on-board Media and Data Storage devices, and other peripherals as applicable. One of the AND gate input is the processor general purpose input/output (GPIO) pin and has provision for pullup and 0 Ω to isolate. The other input of the AND gate is the Main Domain POR (cold reset) status output (PORz_OUT) or Main Domain warm reset status output (RESETSTATz) signal. The choice of reset status output is application dependent. Ensure the attached device reset inputs are pulled as per the device recommendations.

In case an ANDing logic is not implemented and the processor Main Domain warm reset status output (RESETSTATz) is used to reset the attached device, ensure the IO voltage level of the attached device matches the processor IO voltage level. A level translator is recommended to match the IO voltage level.

The power supply (3.3 V) for the SD Card needs to be connected through a controlled external power switch.

The power switch and power switch reset logic allows power cycling of the SD Card (since this is the only way to reset the SD Card) and place the SD Card back into its default state.

For more information on implementing reset logic for the attached devices and power switch enable logic for SD Card, refer Starter Kit SK-AM62B-P1, Starter Kit SK-AM62-LP, Starter Kit SK-AM62-SIP and other SK schematics.