SPRADO2B November   2024  – January 2025 AM62A1-Q1 , AM62A3 , AM62A3-Q1 , AM62A7 , AM62A7-Q1 , AM62D-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1 Introduction
    1. 1.1 Application Note Usage Guidelines
      1. 1.1.1 Custom Board Design - Implementation References
      2. 1.1.2 Processor Family Specific Application Note
      3. 1.1.3 Schematic Design Guidelines
      4. 1.1.4 Schematic Review Checklist
      5. 1.1.5 FAQ Reference for Application Note Usage Guidelines
    2. 1.2 Family Wise List of Processors
      1. 1.2.1 AM62Ax Processor Family
      2. 1.2.2 AM62Dx Processor Family
  5. 2 Related Collaterals
    1. 2.1 Links to Commonly Available and Applicable Collaterals
      1. 2.1.1 AM62A7 / AM62A3 / AM62A7-Q1 / AM62A3-Q1
      2. 2.1.2 AM62D-Q1
    2. 2.2 Hardware Design Considerations for Custom Board Design
  6. 3 Processor Selection
    1. 3.1 Data Sheet Use Case and Version Referenced
    2. 3.2 Processor Selection (OPN Orderable Part Number)
    3. 3.3 Peripheral Instance Naming Convention
    4. 3.4 Unused Peripherals
    5. 3.5 Processor Ordering and Quality
    6. 3.6 Processor Selection Checklist
  7. 4 Power Architecture
    1. 4.1 Generating Supply Rails
      1. 4.1.1 AM62A7 / AM62A3 / AM62A7-Q1 / AM62A3-Q1 and AM62D-Q1
        1. 4.1.1.1 Power Management IC (PMIC)
          1. 4.1.1.1.1 PMIC Checklist for TPS6593x
          2. 4.1.1.1.2 PMIC Checklist for TPS65224x
          3. 4.1.1.1.3 Additional References
        2. 4.1.1.2 Discrete Power
          1. 4.1.1.2.1 DC/DC Converter
          2. 4.1.1.2.2 LDO
          3. 4.1.1.2.3 Discrete Power Checklist
    2. 4.2 Power Control and Circuit Protection
      1. 4.2.1 Load Switch (Power Switching)
        1. 4.2.1.1 Load Switch Checklist
      2. 4.2.2 eFuse IC (Power Switching and Protection)
  8. 5 General Recommendations
    1. 5.1 Processor Performance Evaluation Module (SK - Starter Kit)
      1. 5.1.1 Evaluation Module Checklist
    2. 5.2 Processor-Specific SK Versus Data Sheet
      1. 5.2.1 Notes About Component Selection
        1. 5.2.1.1 Series Resistor
        2. 5.2.1.2 Parallel Pull Resistor
        3. 5.2.1.3 Drive Strength Configuration
        4. 5.2.1.4 Data Sheet Recommendations
        5. 5.2.1.5 Processor IOs - External ESD Protection
        6. 5.2.1.6 Peripheral Clock Output Series Resistor
        7. 5.2.1.7 Component Selection Checklist
      2. 5.2.2 Additional Information Regarding Reuse of SK Design
        1. 5.2.2.1 Updated SK Schematic With Design, Review and CAD Notes Added
        2. 5.2.2.2 SK Design Files Reuse
          1. 5.2.2.2.1 Reuse of SK Design Checklist
    3. 5.3 Before Beginning the Design
      1. 5.3.1  Documentation
      2. 5.3.2  Processor Pin Attributes (Pinout) Verification
      3. 5.3.3  Device Comparison, IOSET and Voltage Conflict
      4. 5.3.4  RSVD Reserved Pins (Signals)
      5. 5.3.5  Note on PADCONFIG Registers
      6. 5.3.6  Processor IO (Signal) Isolation for Fail-Safe Operation
      7. 5.3.7  Reference to Processor-Specific SK
      8. 5.3.8  High-Speed Interface Design Guidelines
      9. 5.3.9  Recommended Current Source or Sink for LVCMOS (GPIO) Outputs
      10. 5.3.10 Connection of Slow Ramp Inputs or Capacitors to LVCMOS IOs (Inputs or Outputs)
      11. 5.3.11 Queries and Clarifications Related to Processor During Custom Board Design
      12. 5.3.12 Before Beginning the Design Checklist
      13. 5.3.13 Device Recommendations
  9. 6 Processor-Specific Recommendations
    1. 6.1 Common (Processor Start-Up) Connection
      1. 6.1.1 Power Supply
        1. 6.1.1.1 Supply for Core and Peripherals
          1. 6.1.1.1.1 Power Supply Ramp (Slew Rate) Requirement and Dynamic Voltage Scaling / Change
          2. 6.1.1.1.2 AM62A7 / AM62A3 / AM62A7-Q1 / AM62A3-Q1 and AM62D-Q1
          3. 6.1.1.1.3 Additional Information
          4. 6.1.1.1.4 Processor Core and Peripheral Core Power Supply Checklist
          5. 6.1.1.1.5 Peripheral Analog Power Supply Checklist
        2. 6.1.1.2 Supply for IO Groups
          1. 6.1.1.2.1 AM62A7 / AM62A3 / AM62A7-Q1 / AM62A3-Q1 and AM62D-Q1
          2. 6.1.1.2.2 Additional Information
          3. 6.1.1.2.3 Supply for IO Groups Checklist
        3. 6.1.1.3 Supply for VPP (eFuse ROM Programming)
          1. 6.1.1.3.1 VPP Checklist
        4. 6.1.1.4 Supply Connection for Partial IO (Low-Power) Mode Configuration
          1. 6.1.1.4.1 Partial IO Mode Used
          2. 6.1.1.4.2 Partial IO Mode Unused
          3. 6.1.1.4.3 Data Sheet Reference for Power Sequence
          4. 6.1.1.4.4 Partial IO (Low-Power) Mode Checklist
        5. 6.1.1.5 Additional Information
      2. 6.1.2 Capacitors for Supply Rails
        1. 6.1.2.1 AM62A7 / AM62A3 / AM62A7-Q1 / AM62A3-Q1 and AM62D-Q1
        2. 6.1.2.2 Additional Information
          1. 6.1.2.2.1 AM62A7 / AM62A3 / AM62A7-Q1 / AM62A3-Q1 and AM62D-Q1
        3. 6.1.2.3 Capacitors for Supply Rails Checklist
      3. 6.1.3 Processor Clock
        1. 6.1.3.1 Clock Inputs
          1. 6.1.3.1.1 High Frequency Oscillator (MCU_OSC0_XI / MCU_OSC0_XO)
          2. 6.1.3.1.2 Low Frequency Oscillator (WKUP_LFOSC0_XI / WKUP_LFOSC0_XO)
          3. 6.1.3.1.3 EXT_REFCLK1 (External Clock Input to Main Domain)
          4. 6.1.3.1.4 Additional Information
          5. 6.1.3.1.5 Clock Input Checklist - MCU_OSC0
          6. 6.1.3.1.6 Clock Input Checklist - WKUP_LFOSC0
        2. 6.1.3.2 Clock Outputs
          1. 6.1.3.2.1 Clock Output Checklist
      4. 6.1.4 Processor Reset
        1. 6.1.4.1 External Reset Inputs
        2. 6.1.4.2 Reset Status Outputs
        3. 6.1.4.3 Additional Information
        4. 6.1.4.4 Processor Reset Input Checklist
        5. 6.1.4.5 Processor Reset Status Output Checklist
      5. 6.1.5 Configuration of Boot Modes (for Processor)
        1. 6.1.5.1 Processor Boot Mode Inputs Isolation Buffers Use Case and Optimization
        2. 6.1.5.2 Boot Mode Selection
          1. 6.1.5.2.1 Notes for USB Boot Mode
        3. 6.1.5.3 Boot Mode Implementation Approaches
        4. 6.1.5.4 Additional Information
        5. 6.1.5.5 Configuration of Boot Modes (for Processor) Checklist
    2. 6.2 Board Debug Using JTAG and EMU
      1. 6.2.1 JTAG and EMU Used
      2. 6.2.2 JTAG and EMU Not Used
      3. 6.2.3 Additional Information
      4. 6.2.4 Board Debug Using JTAG and EMU Checklist
  10. 7 Processor Peripherals
    1. 7.1 Supply Connections for IO Groups
      1. 7.1.1 AM62A7 / AM62A3 / AM62A7-Q1 / AM62A3-Q1 and AM62D-Q1
      2. 7.1.2 Supply Connections for IO Groups Checklist
    2. 7.2 Memory Interface (DDRSS (DDR4/LPDDR4), MMCSD (eMMC/SD/SDIO), OSPI/QSPI and GPMC)
      1. 7.2.1 DDR Subsystem (DDRSS)
        1. 7.2.1.1 DDR4 SDRAM (Double Data Rate 4 Synchronous Dynamic Random-Access Memory)
          1. 7.2.1.1.1 AM62A7 / AM62A3 / AM62A7-Q1 / AM62A3-Q1 and AM62D-Q1
        2. 7.2.1.2 LPDDR4 SDRAM (Low-Power Double Data Rate 4 Synchronous Dynamic Random-Access Memory)
          1. 7.2.1.2.1 AM62A7 / AM62A3 / AM62A7-Q1 / AM62A3-Q1 and AM62D-Q1
            1. 7.2.1.2.1.1 Memory Interface Configuration
            2. 7.2.1.2.1.2 Routing Topology and Terminations
            3. 7.2.1.2.1.3 Resistors for Control and Calibration
            4. 7.2.1.2.1.4 Capacitors for the Power Supply Rails
            5. 7.2.1.2.1.5 Data Bit or Byte Swapping
            6. 7.2.1.2.1.6 LPDDR4 Implementation Checklist
      2. 7.2.2 Multi-Media Card/Secure Digital (MMCSD)
        1. 7.2.2.1 MMC0 - eMMC (Embedded Multi-Media Card) Interface
          1. 7.2.2.1.1 AM62A7 / AM62A3 / AM62A7-Q1 / AM62A3-Q1 and AM62D-Q1
            1. 7.2.2.1.1.1 IO Power Supply
            2. 7.2.2.1.1.2 eMMC (Attached Device) Reset
            3. 7.2.2.1.1.3 Signals Connection
            4. 7.2.2.1.1.4 Capacitors for the Power Supply Rails
            5. 7.2.2.1.1.5 MMC0 (eMMC) Checklist
          2. 7.2.2.1.2 Additional Information on eMMC PHY
          3. 7.2.2.1.3 MMC0 – SD (Secure Digital) Card Interface
        2. 7.2.2.2 MMC1/MMC2 – SD (Secure Digital) Card Interface
          1. 7.2.2.2.1 IO Power Supply
          2. 7.2.2.2.2 SD Card Supply Reset and Boot Configuration
          3. 7.2.2.2.3 Signals Connection
          4. 7.2.2.2.4 ESD Protection
          5. 7.2.2.2.5 Capacitors for the Power Supply Rails
          6. 7.2.2.2.6 MMC1 SD Card Interface Checklist
        3. 7.2.2.3 MMC1 / MMC2 SDIO (Embedded) Interface
          1. 7.2.2.3.1 IO Power Supply
          2. 7.2.2.3.2 Signals Connection
          3. 7.2.2.3.3 MMC2 SDIO (Embedded) Interface Checklist
        4. 7.2.2.4 Additional Information
      3. 7.2.3 Octal Serial Peripheral Interface (OSPI) or Quad Serial Peripheral Interface (QSPI)
        1. 7.2.3.1 IO Power Supply
        2. 7.2.3.2 OSPI/QSPI Device Reset
        3. 7.2.3.3 Signals Connection
        4. 7.2.3.4 Loopback Clock
        5. 7.2.3.5 Interface to Multiple Devices
        6. 7.2.3.6 Capacitors for the Power Supply Rails
        7. 7.2.3.7 OSPI or QSPI Interface Implementation Checklist
      4. 7.2.4 General-Purpose Memory Controller (GPMC)
        1. 7.2.4.1 IO Power Supply
        2. 7.2.4.2 GPMC Interface
        3. 7.2.4.3 Memory (Attached Device) Reset
        4. 7.2.4.4 Signals Connection
          1. 7.2.4.4.1 GPMC NAND
        5. 7.2.4.5 Capacitors for the Power Supply Rails
        6. 7.2.4.6 GPMC Interface Checklist
    3. 7.3 External Communication Interface (Ethernet (CPSW3G), USB2.0, UART and Controller Area Network (CAN))
      1. 7.3.1 Ethernet Interface Using CPSW3G (Common Platform Ethernet Switch 3-Port Gigabit)
        1. 7.3.1.1  IO Power Supply
        2. 7.3.1.2  Ethernet PHY Reset
        3. 7.3.1.3  Ethernet PHY Pin Strapping
        4. 7.3.1.4  Ethernet PHY (and MAC) Operation and Media Independent Interface (MII) Clock
          1. 7.3.1.4.1 Crystal
          2. 7.3.1.4.2 Oscillator
          3. 7.3.1.4.3 Processor Clock Output (CLKOUT0)
        5. 7.3.1.5  MAC (Data, Control and Clock) Interface Signals Connection
        6. 7.3.1.6  External Interrupt (EXTINTn)
          1. 7.3.1.6.1 External Interrupt (EXTINTn) Checklist
        7. 7.3.1.7  MAC (Media Access Controller) to MAC Interface
        8. 7.3.1.8  MDIO (Management Data Input/Output) Interface
        9. 7.3.1.9  Ethernet MDI (Medium Dependent Interface) Including Magnetics
        10. 7.3.1.10 Capacitors for the Power Supply Rails
        11. 7.3.1.11 Ethernet Interface Checklist
      2. 7.3.2 Universal Serial Bus (USB2.0)
        1. 7.3.2.1 USBn (n = 0-1) Used
          1. 7.3.2.1.1 USB Host Interface
          2. 7.3.2.1.2 USB Device Interface
          3. 7.3.2.1.3 USB Dual-Role-Device Interface
          4. 7.3.2.1.4 USB Type-C®
        2. 7.3.2.2 USBn (n = 0-1) Not Used
        3. 7.3.2.3 Additional Information
        4. 7.3.2.4 USB Interface Checklist
      3. 7.3.3 Universal Asynchronous Receiver/Transmitter (UART)
        1. 7.3.3.1 Universal Asynchronous Receiver/Transmitter (UART) Checklist
      4. 7.3.4 Controller Area Network (CAN)
        1. 7.3.4.1 Controller Area Network Checklist
    4. 7.4 On-board Synchronous Communication Interface (MCSPI, MCASP and I2C)
      1. 7.4.1 Multichannel Serial Peripheral Interface (MCSPI) and Multichannel Audio Serial Ports (MCASP)
        1. 7.4.1.1 MCSPI Checklist
        2. 7.4.1.2 MCASP Checklist
      2. 7.4.2 Inter-Integrated Circuit (I2C)
        1. 7.4.2.1 I2C (Open-drain Output Type Buffer) Interface Checklist
        2. 7.4.2.2 I2C (Emulated Open-drain Output Type Buffer) Interface Checklist
    5. 7.5 User Interface (CSIRX0, DPI), GPIO and Hardware Diagnostics
      1. 7.5.1 Camera Serial Interface (CSI-Rx (CSI-2 port, CSIRX0 Instance))
        1. 7.5.1.1 CSIRX0 Used
        2. 7.5.1.2 CSIRX0 Not Used
        3. 7.5.1.3 CSIRX0 Checklist
      2. 7.5.2 Display Subsystem
        1. 7.5.2.1 Display Parallel Interface (DPI)
          1. 7.5.2.1.1 AM62A7 / AM62A3 / AM62A7-Q1 / AM62A3-Q1
            1. 7.5.2.1.1.1 IO Power Supply
            2. 7.5.2.1.1.2 DPI (Attached Device) Reset
            3. 7.5.2.1.1.3 Connection
            4. 7.5.2.1.1.4 Signals Connection
            5. 7.5.2.1.1.5 Capacitors for the Power Supply Rails
            6. 7.5.2.1.1.6 DPI (VOUT0) Checklist
          2. 7.5.2.1.2 AM62D-Q1
      3. 7.5.3 General Purpose Input/Output (GPIO)
        1. 7.5.3.1 Availability of CLKOUT on Processor GPIO
        2. 7.5.3.2 Connection and External Buffering
        3. 7.5.3.3 Additional Information
        4. 7.5.3.4 GPIO Checklist
      4. 7.5.4 On-board Hardware Diagnostics
        1. 7.5.4.1 Monitoring of On-board Supply Voltages Using Processor Voltage Monitors
          1. 7.5.4.1.1 Voltage Monitor Pins Used
            1. 7.5.4.1.1.1 Voltage Monitor Checklist
          2. 7.5.4.1.2 Voltage Monitor Pins Not Used
        2. 7.5.4.2 Internal Temperature Monitoring
          1. 7.5.4.2.1 Internal Temperature Monitoring Checklist
        3. 7.5.4.3 Connection of Error Signal Output (MCU_ERRORn)
        4. 7.5.4.4 High Frequency Oscillator (MCU_OSC0) Clock Loss Detection
    6. 7.6 Verifying Board Level Design Issues
      1. 7.6.1 Processor Pin Configuration Using PinMux Tool
      2. 7.6.2 Schematics Configurations
      3. 7.6.3 Connecting Supply Rails to Pullups
      4. 7.6.4 Peripheral (Subsystem) Clock Outputs
      5. 7.6.5 General Board Bring-up and Debug
        1. 7.6.5.1 Clock Output for Board Bring-Up, Test, or Debug
        2. 7.6.5.2 Additional Information
        3. 7.6.5.3 General Board Bring-up and Debug Checklist
  11. 8 Self-Review of the Custom Board Schematics Design
  12. 9 Layout Notes (Added on the Schematic)
    1. 9.1 Layout Checklist
  13. 10Custom Board Design Simulation
  14. 11Additional References
    1. 11.1 FAQ Covering AM6xx Processor Family
    2. 11.2 FAQs - Processor Product Family Wise and Sitara Processor Families
    3. 11.3 Processor Attached Devices
  15. 12Summary
  16. 13References
    1. 13.1 AM62A7, AM62A3, AM62A7-Q1, AM62A3-Q1
    2. 13.2 AM62D-Q1
    3. 13.3 AM62P, AM62P-Q1
    4. 13.4 AM625, AM623, AM625SIP, AM625-Q1, AM620-Q1
    5. 13.5 Common for all Processor Families
    6. 13.6 Master List of Available FAQs - Processor Family Wise
    7. 13.7 Master List of Available FAQs - Sitara Processor Families
    8. 13.8 FAQs Including Software Related
    9. 13.9 FAQs for Attached Devices
  17. 14Terminology
  18. 15Revision History
7.2.2.2.6 MMC1 SD Card Interface Checklist

General

Review and verify the following for the custom schematic design:

  1. Above sections, including relevant application notes and FAQ links.
  2. Pin attributes, signal description, and electrical specifications.
  3. Electrical characteristics, timing parameters and any additional available information.
  4. Include a series resistor (0Ω) on MMC1_CLK placed as close to processor clock output pin as possible to minimize reflections. MMC1_CLK is looped back internally on read transactions, and the resistor minimize possible signal reflections, which can cause false clock transitions. Use 0Ω initially and the value as required to match the PCB trace impedance.
  5. The MMC1 CLK, CMD, and DAT0-3 signal interfaces are implemented using SDIO buffers on pins powered from VDDSHV5 (power source that changes the operating voltage level from 3.3V to 1.8V as the transfer speed transitions to one of the higher speed data transfer modes).
  6. The MMC1 SDCD and SDWP signal functions are implemented with LVCMOS buffers on pins powered from VDDSHV0, which operate at fixed 1.8V or 3.3V.
  7. The SDIO buffers are designed to support dynamic voltage change. Dynamic voltage change is necessary since UHS-I SD cards begins operating with 3.3V signaling and changes to 1.8V signaling when the SD card transitions to one of the higher speed data transfer modes.

    Processor IO buffers are off during reset. An external pullup is recommended for any of the processor or attached device IOs that can float. Pullups are recommended on all data and command signals. Verify internal pullups are not configured when (improves noise immunity) external pullups are used.

  8. To meet the SD card specification, a 47kΩ pullup is recommended when internal pulls are unexpectedly enabled. The 47kΩ pullup verifies the resulting pull resistance is within the specified range.
  9. When UHS-I speed support is required, implementing an LDO supply that switches output between 3.3V and 1.8V is required. Switching IO supply can be an external discrete implementation or internal to the PMIC. Connect the switchable voltage output to the IO supply for IO group, referencing the SD interface signals (VDDSHV5).
  10. When UHS-I speed support is required, while the IO voltage for SD card interface is either 1.8V or 3.3V, the SD card VDD supply is connected to a fixed 3.3V source.
  11. When UHS-I speed support is required, the 3.3V SD card power is required to be switched through a load switch to allow resetting of the SD card IO supply to 3.3V. Provision to enable the SD card load switch during reset is required.
  12. Provide provision to reset the load switch using the SD card load switch EN signal during cold reset, warm reset and normal operation using processor IO is required to be provided. An option is to use 3-input ANDing logic.
  13. During boot, the ROM code checks the status of the card detect pin (SDCD, pin P23). The signal is expected to be low to indicate SD card is detected (inserted).

Schematic Review

Follow the below list for the custom schematic design:

  1. Required bulk and decoupling capacitors are provided. Compare with the SK schematics.
  2. Pull values used for the data, command and clock signals. Compare with the relevant SK schematics.
  3. Series resistor value and placement on the clock output signal near to the processor.
  4. When UHS-I speed support is required, verify IO supply for IO group rail switching (3.3V/1.8V) and the SD card power switching, power switch reset circuits are added.
  5. Supply rail connected to the SD card power supply (use SYS voltage).
  6. Implementation of reset logic for resetting the SD card power control load switch. Provision for slew rate control of the SD card supply control power switch is provided.
  7. Supply rails connected follow the ROC.
  8. Required external ESD protection are provided for the SD interface signals.

Additional

  1. The logic state of the MMC1_SDCD and MMC1_SDWP inputs to the host must not change when a UHS-I SD card changes the IO operating voltage. Maintaining a valid logic state is not possible if the signals propagate through an input buffer of a dual-voltage SDIO cell that changes voltage. The signal functions are assigned to IOs that do not change voltage dynamically. Signals only connect to switches in the SD card connector, so there is no reason for the signals to change voltage when the SD card signals change operating voltage. The MMC1_SDCD and MMC1_SDWP signals are required to connect to the SD card connector switches and pull high with external pull resistors connected to the VDDSHV0. The other MMC1 SD card signals with pullups are required to have pulls powered by the VDDSHV5 source that dynamically changes voltage
  2. The MMC2_SDCD and MMC2_SDWP pins are referenced to the same IO supply for IO group the other MMC2 pins. Connecting an UHS-I SD card to MMC2 requires avoiding the use of the control for the MMC2_SDCD and MMC2_SDWP signal functions. For SD card use case, the signal functions needs to implemented using one of the other pin multiplexing options that uses an IO cell powered from a fixed voltage source. The MMC2 assignments differ because MMC2 was originally intended for use with on-board fixed voltage SDIO devices, such as Wi-Fi® or Bluetooth® transceivers.
  3. SD card power switch, along with the power switch supply EN pin reset logic, and the processor IO supply for IO group supply switching circuit is required to support UHS-I SD cards which begins communication using 3.3V IO level and later change to 1.8V IO level when changing to one of the faster data transfer speeds.

    Cycling power to the SD card is the only way to put the SD card back into 3.3V mode because SD cards do not have a reset pin. The processor IO supply for IO group supply must power off and on and switch voltage at the same time as the SD card. The circuits and the software driver operating the signals sourcing the circuits verifies that both devices are off, or on and operating at the same IO voltage at the same time.

  4. To optimize the ANDing logic, use a dual input AND gate with RESETSTATz and the processor IO as inputs
  5. Add a series resistor 100Ω on the SDCD pin since processor IO connects directly to the ground when the SD card is inserted