SPRUJ86A October   2023  – January 2024 AM263P4

 

  1.   1
  2.   Description
  3.   Features
  4.   4
  5. 1Evaluation Module Overview
    1. 1.1 Introduction
      1.      Preface: Read This First
        1. 1.1.1.1 Sitara MCU+ Academy
        2. 1.1.1.2 Important Usage Notes
    2. 1.2 Kit Contents
    3. 1.3 Device Information
      1. 1.3.1 HSEC 180-pin Control Card Docking Station
      2. 1.3.2 Security
  6. 2Hardware
    1. 2.1  Component Identification
    2. 2.2  Power Requirements
      1. 2.2.1 Power Input Using USB Type-C Connector
      2. 2.2.2 Power Status LEDs
      3. 2.2.3 Power Tree
      4. 2.2.4 Power Sequence
      5. 2.2.5 PMIC
    3. 2.3  Functional Block Diagram
    4. 2.4  Reset
    5. 2.5  Clock
    6. 2.6  Boot Mode Selection
    7. 2.7  JTAG Path Selection
    8. 2.8  Header Information
    9. 2.9  GPIO Mapping
    10. 2.10 Push Buttons
    11. 2.11 Interfaces
      1. 2.11.1  Memory Interface
        1. 2.11.1.1 OSPI/QSPI
        2. 2.11.1.2 Board ID EEPROM
      2. 2.11.2  Ethernet Interface
        1. 2.11.2.1 Control Card Ethernet Routing
        2. 2.11.2.2 On Board Ethernet PHY
        3. 2.11.2.3 LED Indication in RJ45 Connector
      3. 2.11.3  I2C
      4. 2.11.4  Industrial Application LEDs
      5. 2.11.5  SPI
      6. 2.11.6  UART
      7. 2.11.7  MCAN
      8. 2.11.8  FSI
      9. 2.11.9  JTAG
      10. 2.11.10 Test Automation Header
      11. 2.11.11 LIN
      12. 2.11.12 MMC
      13. 2.11.13 ADC and DAC
    12. 2.12 HSEC Pinout and Pinmux Mapping
  7. 3Hardware Design Files
  8. 4Additional Information
    1. 4.1 If You Need Assistance
    2. 4.2 Trademarks
  9. 5Related Documentation
    1. 5.1 Supplemental Content
      1.      5.1.A E1 Board Modifications
      2.      5.1.B E2 Design Changes
  10. 6References
    1. 6.1 Reference Documents
    2. 6.2 Other TI Components Used in This Design
  11. 7Revision History

2.11.6 UART

The AM263Px Control Card uses the XDS110 as a USB2.0 to UART bridge for terminal access. UART0 transmit and receive signals of the AM263Px SoC are mapped to the XDS110 with a dual channel isolation buffer (ISO7221CDR) for translating from the 3.3V IO voltage supply (VSYS_3V3C) to the 3.3V 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 VBUS 5V power of the micro-B USB connector is mapped to a low dropout regulator (TPS79601DRBR) to generate the 3.3V 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-A4C13B56-E228-4F95-81E3-EA0E47899157-low.png Figure 2-26 UART-USB Bridge for Emulation

The Control Card supports an additional UART1 and UART2 instance that has the transmit and receive signals mapped from the AM263Px 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. To make use of UART2, the select line of a 1:2 mux must be high. The select line is driven by a GPIO signal (UART2_MUX_SEL) that is sourced from the IO expander.

Table 2-20 UART Mux Select Logic
Instance Select Condition Function
UART1 LOW LIN Selected A→B1
HIGH HSEC UART1 Selected A→B2
UART2 LOW SOC_INTn/USER_LED0 Selected A→B1
HIGH HSEC UART2 Selected A→B2
GUID-269DCF3F-B252-4303-B827-A2AF3C6C33A0-low.png Figure 2-27 UART 1:2 MUX to HSEC