SDAA044 September   2025 AM623 , AM625 , AM62L

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1 Introduction
  5. 2 Overview of AM62x vs AM62Lx
  6. 3 Power Architecture and PMIC Considerations
  7. 4 IO Voltage Domains and Signal Levels
    1. 4.1 Dual-Voltage vs. 1.8V-Only IO Banks
    2. 4.2 Buffer Types and Fail-Safe IOs
  8. 5 Peripheral Interface Changes
    1. 5.1 Memory Interfaces
    2. 5.2 Connectivity
    3. 5.3 Media and Display Interfaces
    4. 5.4 Analog and Other Interfaces
  9. 6 Boot Configuration and Reset Changes
  10. 7 Package and Layout Considerations
    1. 7.1 BGA Package Options
    2. 7.2 Thermal and Power Dissipation
  11. 8 Summary
  12. 9 Terminology and Acronyms
  13. 10References

6 Boot Configuration and Reset Changes

AM62Lx streamlines the bootstrapping and reset structure compared to AM62x. The Table 6-1 table lists new bootstrap pin requirements, supported boot media, and other boot and reset-related changes.

For AM62Lx helpful FAQs and an overview on boot configuration, check the respective AM62Lx Schematic Design Guidelines and Schematic Review Checklist or AM62x Schematic Design Guidelines and Review Checklist Configuration of Boot Modes for Processor section.

For more detailed boot mode information and pin-mux settings, refer to the respective AM62Lx Sitara™ Processors data sheet or AM62x Sitara™ Processors data sheet Pin Attributes section, and the respective AM62L Technical Reference Manual or AM62x Technical Reference Manual Boot Mode Pins section.

Table 6-1 Boot and Reset Signal Changes
ASPECT AM62x AM62Lx DESIGN NOTES
Bootstrap Pins Options
  • 16 boot mode pins (BOOTMODE[15:0])
  • Reduced Pincount: 4 bootstrap pins (BOOTMODE[15:12])
  • Full Pincount: 16 bootstrap pins (BOOTMODE[15:0])
 Boot pins must be pulled up or down and not floating. For more information, refer to the AM62L Technical Reference Manual Boot Mode Pin Mapping Options Section.
Boot Modes
  • UART
  • I2C EEPROM
  • OSPI/QSPI Flash
  • GPMC NOR/NAND Flash
  • Serial NAND Flash
  • SD Card
  • eMMC
  • USB
  • Ethernet
  • UART
  • No I2C EEPROM
  • OSPI/QSPI Flash
  • GPMC NAND (no NOR) Flash
  • No Serial NAND Flash
  • SD Card
  • eMMC
  • USB
  • No Ethernet
 For AM62Lx, remove old boot circuitry to reduce BOM and simplify design. See AM62x Sitara™ Processors data sheet, and AM62Lx Sitara™ Processors data sheet for supported options.
Reset Inputs
  • MCU_PORz
  • MCU_RESETz
  • RESET_REQz
  • PORz
  • RESETz
  • RTC_PORz
  • No MCU_PORz
 N/A
Reset Outputs
  • PORz_OUT
  • RESETSTATz
  • MCU_RESETSTATz
  • RESETSTATz
  • No MCU_RESETSTATz
 N/A
Wake Pins
  • EXTINTn
  • partial CAN/UART on MCU domain
  • EXTINTn
  • EXT_WAKEUP0/1
  • No CAN/UART wake (no MCU)
 For AM62Lx, if not connected to a wake source, connect EXT_WAKEUP0/1 to corresponding power supply through external pull-resistor.