SPRAD61A March   2023  – November 2023 AM2732 , AM2732 , AM2732-Q1 , AM2732-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1 Introduction
    1. 1.1 Acronyms
  5. 2 Power
    1. 2.1 Discrete DC-DC Power Solution
    2. 2.2 Integrated PMIC Power Solution
    3. 2.3 Power Decoupling and Filtering
    4. 2.4 Power Consumption
  6. 3 Clocking
    1. 3.1 Crystal and Oscillator Input Options
    2. 3.2 Output Clock Generation
    3. 3.3 Crystal Selection and Shunt Capacitance
    4. 3.4 Crystal Placement and Routing
  7. 4 Resets
  8. 5 Bootstrapping
    1. 5.1 SOP Signal Implementation
    2. 5.2 QSPI Memory Controller Implementation
    3. 5.3 ROM QSPI Boot Requirements
  9. 6 JTAG Emulators and Trace
  10. 7 Multiplexed Peripherals
  11. 8 Digital Peripherals
    1. 8.1 General Digital Peripheral Routing Guidelines
  12. 9 Layer Stackup
    1. 9.1 TMDS273GPEVM Layer Stackup
      1. 9.1.1 TMDS273GPEVM Key Stackup Features
    2. 9.2 Four Layer ZCE Example Layer Stackup
      1. 9.2.1 ZCE Four Layer Example Key Stackup Features
    3. 9.3 Four Layer NZN Example Layer Stackup
      1. 9.3.1 NZN Four Layer Example Key Stackup Features
  13. 10Vias
  14. 11BGA Power Fan-Out and Decoupling Placement
    1. 11.1 Ground Return
      1. 11.1.1 Ground Return - TMDS273GPEVM
      2. 11.1.2 Ground Return - ZCE Four Layer Example
      3. 11.1.3 Ground Return - NZN Four Layer Example
    2. 11.2 1.2 V Core Digital Power
      1. 11.2.1 1.2 V Core Digital Power Key Layout Considerations
        1. 11.2.1.1 1.2V Core Layout - TMDS273GPEVM
        2. 11.2.1.2 1.2V Core Layout - ZCE Four Layer Example
        3. 11.2.1.3 1.2V Core Layout - NZN Four Layer Example
    3. 11.3 3.3 V Digital and Analog Power
      1. 11.3.1 3.3 V Digital and Analog Power Key Layout Considerations
        1. 11.3.1.1 3.3V Digital and Analog Layout - TMDS273GPEVM
        2. 11.3.1.2 3.3V Digital and Analog Layout - ZCE Four Layer Example
        3. 11.3.1.3 3.3V Digital and Analog Layout - NZN Four Layer Example
    4. 11.4 1.8 V Digital and Analog Power
      1. 11.4.1 1.8 V Digital and Analog Power Key Layout Considerations
        1. 11.4.1.1 1.8V Digital and Analog Layout - TMDS273GPEVM
        2. 11.4.1.2 1.8V Digital and Analog Layout - ZCE Four Layer Example
        3. 11.4.1.3 1.8V Digital and Analog Layout - NZN Four Layer Example
  15. 12References
  16. 13Revision History

5 Bootstrapping

The start-on-power (SOP) signals are used to latch in the selected boot mode into the AM273x device. During the NRESET rising edge (low to high logic transition) the SOP[4:0] signals are sampled. The resulting 5 bits are used to select the XTAL Frequency and to branch the boot ROM into the selected boot mode. Not all combinations are supported. For a full description of the SOP pin states and supported boot modes, see the AM273x Sitara™ Microcontroller Data Sheet.