SPRUJ93 august   2023

 

  1.   1
  2.   Description
  3.   Features
  4.   4
  5. 1Evaluation Module Overview
    1.     Preface: Read This First
      1. 1.1.1 Sitara™ MCU+ Academy
      2. 1.1.2 If You Need Assistance
      3. 1.1.3 Important Usage Notes
    2. 1.1 Introduction
    3. 1.2 Kit Contents
    4. 1.3 Specification
    5. 1.4 Device Information
    6. 1.5 HSEC 180-pin Control Card Docking Station
    7. 1.6 Security
  6. 2Hardware
    1. 2.1  Functional Block Diagram
    2. 2.2  Component Identification
    3. 2.3  Power Requirements
      1. 2.3.1 Power Input Using USB Type-C Connector
      2. 2.3.2 Power Status LEDs
      3. 2.3.3 Power Tree
      4. 2.3.4 Power Sequence
      5. 2.3.5 PMIC
    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 Test Points
    12. 2.12 Interfaces
      1. 2.12.1  Memory Interface
        1. 2.12.1.1 QSPI
        2. 2.12.1.2 Board ID EEPROM
      2. 2.12.2  Ethernet Interface
        1. 2.12.2.1 RGMII
        2. 2.12.2.2 PRU-ICSS
        3. 2.12.2.3 LED Indication in RJ45 Connector
      3. 2.12.3  I2C
      4. 2.12.4  Industrial Application LEDs
      5. 2.12.5  SPI
      6. 2.12.6  UART
      7. 2.12.7  MCAN
      8. 2.12.8  FSI
      9. 2.12.9  JTAG
      10. 2.12.10 Test Automation Header
      11. 2.12.11 LIN
      12. 2.12.12 MMC
      13. 2.12.13 ADC and DAC
    13. 2.13 HSEC Pinout and Pinmux Mapping
  7. 3Software
    1. 3.1 SDK Installation
  8. 4Hardware Design Files
  9. 5Additional Information
    1. 5.1 Trademarks
    2. 5.2 E1 Design Hardware Modifications
  10. 6References
    1. 6.1 Reference Documents
    2. 6.2 Other TI Components Used in This Design

2.12.6 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 (VSYS_3V3C) 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 3.3 V supply for the XDS110 allows for the emulator to maintain a connection when power to the Control Card is removed.

GUID-20230515-SS0I-60Z2-HXW5-W7NPD9VPF4RV-low.png Figure 2-26 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 2-23 UART Mux Select Logic
Select Condition Function
LOW LIN Selected A→B1
HIGH HSEC UART Selected A→B2
GUID-20230515-SS0I-G6K6-WJNX-LPX5RKJWK7HZ-low.png Figure 2-27 UART 1:2 MUX to HSEC