SPRUJ09D March   2022  – September 2023 AM2631 , AM2631-Q1 , AM2632 , AM2632-Q1 , AM2634 , AM2634-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Preface: Read This First
    1. 2.1 Sitara MCU+ Academy
    2. 2.2 If You Need Assistance
    3. 2.3 Important Usage Notes
  5. 2Control Card Overview
    1. 3.1 Kit Contents
    2. 3.2 Key Features
    3. 3.3 Component Identification
    4. 3.4 HSEC 180-pin Control Card Docking Station
    5. 3.5 Compliance
  6. 3Board Setup
    1. 4.1 Power Requirements
      1. 4.1.1 Power Input Using USB Type-C Connector
      2. 4.1.2 Power Status LEDs
      3. 4.1.3 Power Tree
      4. 4.1.4 Power Sequence
    2. 4.2 Push Buttons
    3. 4.3 Boot Mode Selection
    4. 4.4 JTAG Path Selection
  7. 4Hardware Description
    1. 5.1  Functional Block Diagram
    2. 5.2  GPIO Mapping
    3. 5.3  Reset
    4. 5.4  Clock
    5. 5.5  Memory Interface
      1. 5.5.1 QSPI
      2. 5.5.2 Board ID EEPROM
    6. 5.6  Ethernet Interface
      1. 5.6.1 RGMII
      2. 5.6.2 PRU-ICSS
      3. 5.6.3 LED Indication in RJ45 Connector
    7. 5.7  I2C
    8. 5.8  Industrial Application LEDs
    9. 5.9  SPI
    10. 5.10 UART
    11. 5.11 MCAN
    12. 5.12 FSI
    13. 5.13 JTAG
    14. 5.14 Test Automation Header
    15. 5.15 LIN
    16. 5.16 MMC
    17. 5.17 ADC and DAC
    18. 5.18 HSEC Pinout and Pinmux Mapping
  8. 5References
    1. 6.1 References
    2. 6.2 Other TI Components Used in This Design
  9.   Revision History
  10.   A E2 Design Changes
  11.   B E1 HSEC Pinout Table

4.10 UART

The AM263x Control Card uses the XDS110 as a USB2.0 to UART bridge for terminal access. UART0 transmit and receive signals of the AM263x SoC are mapped to the XDS110 with a dual channel isolation buffer (ISO7221CDR) for translating from the 3.3 V IO voltage supply to the 3.3 V XDS supply. The XDS110 is connected to a micro-B USB connector for the USB 2.0 signals. ESD protection is provided to the USB 2.0 signals by a transient voltage suppression device (TPD4E004DRYR). The micro-B USB connector's VBUS 5 V power is mapped to a low dropout regulator (TPS79601DRBR) to generate the 3.3 V XDS supply. A separate 3.3V supply for the XDS110 allows for the emulator to maintain a connection when power to the Control Card is removed.

GUID-20220426-SS0I-XG6D-VDSW-SK3QSFZ23H5B-low.png Figure 4-17 UART-USB Bridge for Emulation

The Control Card supports an additional UART1 instance that has the transmit and receive signals mapped from the AM263x SoC to the HSEC connector. To make use of UART1, the select line of a 1:2 mux must be high. The select line is driven by a GPIO signal (LIN_MUX_SEL) that is sourced from the IO expander.

Table 4-13 UART Mux Select Logic
Select Condition Function
LOW LIN Selected A→B1
HIGH HSEC UART Selected A→B2
GUID-20220426-SS0I-TNHR-DGGM-MDS9MXL3R7TR-low.png Figure 4-18 UART 1:2 MUX to HSEC