SPRAD85B September   2024  – December 2024 AM62A3 , AM62A3-Q1 , AM62A7 , AM62A7-Q1 , AM62D-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1 Introduction
    1. 1.1 Before Getting Started With the Custom Board Design
    2. 1.2 Processor Selection
    3. 1.3 Technical Documentation
      1. 1.3.1 Updated SK Schematics With Design, Review and Cad Notes Added
        1. 1.3.1.1 AM62A7 / AM62A3 / AM62A7-Q1 / AM62A3-Q1
        2. 1.3.1.2 AM62D-Q1
      2. 1.3.2 FAQs to Support Custom Board Design
    4. 1.4 Custom Board Design Documentation
  5. 2 Block Diagram
    1. 2.1 Constructing the Block Diagram
    2. 2.2 Configuring the Boot Mode
    3. 2.3 Confirming PinMux (PinMux Configuration)
  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 Dynamic Switching Dual-Voltage IO Supply LDO
      4. 3.2.4 Internal LDOs for IO Groups (Processor)
      5. 3.2.5 Dual-Voltage IOs (for Processor IO Groups)
      6. 3.2.6 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 Note on PDN Target Impedance
    6. 3.6 Power Supply Sequencing
    7. 3.7 Supply Diagnostics
    8. 3.8 Power Supply Monitoring
  7. 4 Processor Clocking
    1. 4.1 Processor External Clock Source
      1. 4.1.1 Unused WKUP_LFOSC0
      2. 4.1.2 LVCMOS Digital Clock Source
      3. 4.1.3 Crystal Selection
    2. 4.2 Processor 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 BSDL File
      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 Controller (DDRSS)
      1. 7.2.1 Processor DDR Subsystem and Device Register Configuration
      2. 7.2.2 Calibration Resistor Connection for DDRSS
      3. 7.2.3 Attached Memory Device ZQ and Reset_N Connection
    3. 7.3  Media and Data Storage Interfaces
    4. 7.4  Common Platform Ethernet Switch 3-port Gigabit (CPSW3G - for Ethernet Interface)
    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 AM62A7 / AM62A3 / AM62A7-Q1 / AM62A3-Q1
      2. 7.8.2 AM62D-Q1
    9. 7.9  Camera Interface
    10. 7.10 Connection of Processor Power Supply Pins, Unused Peripherals and IOs
      1. 7.10.1 External Interrupt (EXTINTn)
      2. 7.10.2 RSVD Reserved Pins (Signals)
  11. 8 Interfacing of Processor IOs (LVCMOS or Open-Drain or Fail-Safe Type IO Buffers) and Simulations
    1. 8.1 IBIS Model
    2. 8.2 IBIS-AMI Model
  12. 9 Processor Current Rating and Thermal Analysis
    1. 9.1 Power Estimation
    2. 9.2 Maximum Current Rating for Different Supply Rails
    3. 9.3 Power Modes
    4. 9.4 Thermal Design Guidelines
      1. 9.4.1 Thermal Model
      2. 9.4.2 VTM (Voltage Thermal Management Module)
  13. 10Schematics:- Design, Capture, Entry 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 LPDDR4 Design and Layout Guidelines
    3. 11.3 High-Speed Differential Signals Routing Guidelines
    4. 11.4 Board Layer Count and Stack-up
      1. 11.4.1 Simulation Recommendations
    5. 11.5 Reference for Steps to be Followed for Running Simulation
  15. 12Custom Board Assembly and Testing
    1. 12.1 Guidelines and Board Bring-up Tips
  16. 13Device Handling and Assembly
    1. 13.1 Soldering Recommendations
      1. 13.1.1 Additional References
  17. 14References
    1. 14.1 AM62A7 / AM62A3 / AM62A7-Q1 / AM62A3-Q1
    2. 14.2 AM62D-Q1
    3. 14.3 Common
  18. 15Terminology
  19. 16Revision History

4.1 Processor External Clock Source

The recommended processor clock sources and recommended connections are summarized in the Clock Specifications section in the Specifications chapter of the device-specific data sheet.

A 25MHz external crystal interface pins connected to the internal high frequency oscillator (MCU_HFOSC0) or MCU_OSC0 LVCMOS digital clock is the default clock source for internal reference clock HFOSC0_CLKOUT.

Refer to [FAQ] AM625 / AM623 / AM625SIP / AM625-Q1 / AM620-Q1 Custom board hardware design – Queries regarding MCU_OSC0 Start-up Time. The FAQ is generic and can also be used for AM62A7 / AM62A3 / AM62A7-Q1 / AM62A3-Q1 and AM62D-Q1 processor families.

Low-frequency oscillator (LFOSC0) has limited use case and is optional. Based on the use case, select a 32.768kHz crystal as clock source. For more information, see the [FAQ] AM625: LFOSC usage in the device. The FAQ is generic and can also be used for AM62A7 / AM62A3 / AM62A7-Q1 / AM62A3-Q1 and AM62D-Q1 processor families.