SPRABN2A March   2019  – December 2019 AM3352 , AM3354 , AM3356 , AM3357 , AM3358 , AM3358-EP , AM3359

 

  1.   AM335x Schematic Checklist
    1.     Trademarks
    2. 1 Introduction
    3. 2 Recommendations Specific to AM335x
      1. 2.1  Unused Signals
      2. 2.2  SYSBOOT Configuration and Required Termination
      3. 2.3  System Issues
        1. 2.3.1 Pinmux
        2. 2.3.2 Pullups
        3. 2.3.3 General Debug
        4. 2.3.4 Warm Reset
        5. 2.3.5 Peripheral Clocking
      4. 2.4  Low-Power Considerations
      5. 2.5  Clocking
      6. 2.6  General DDR Guidelines
        1. 2.6.1 DDR2
        2. 2.6.2 DDR3
      7. 2.7  MultiMedia Card/ (MMC)
      8. 2.8  Inter-Integrated Circuit (I2C)
      9. 2.9  LCD
      10. 2.10 Power
      11. 2.11 Touchscreen
        1. 2.11.1 If ADC/Touchscreen is not Used
      12. 2.12 USB
        1. 2.12.1 If USB0 or USB1 is not Used
      13. 2.13 External Interrupt (EXTINTn)
      14. 2.14 Ethernet
    4. 3 References
  2.   Revision History

2.2 SYSBOOT Configuration and Required Termination

ROM code depends on SYSBOOT configuration pins to determine the boot device order, boot configuration, and crystal frequency available on the board. These SYSBOOT pins are sampled only once on the rising edge of PWRONRSTn/PORz release and the Control Module register CONTROL_STATUS will reflect the configuration values as sampled. All 16 pins on SYSBOOT[15:0] must be terminated high or low and cannot be left floating. The desired high or low logic levels should be present at the pins before PORz is released to ensure correct sampling. For more information, see the Device Control and Status and Initialization chapters in the AM335x and AMIC110 Sitara™ Processors Technical Reference Manual.