SPRUJF7 March   2025

 

  1.   1
  2.   Description
  3.   Get Started
  4.   Features
  5.   5
  6. 1Evaluation Module Overview
    1. 1.1 Introduction
      1.      Preface: Read This First
      2. 1.1.1 Sitara MCU+ Academy
      3. 1.1.2 Important Usage Notes
    2. 1.2 Kit Contents
    3. 1.3 Specification
      1. 1.3.1 Component Identification
      2. 1.3.2 Functional Block Diagram
    4. 1.4 Device Information
  7. 2Hardware
    1. 2.1  Additional Images
    2. 2.2  Setup
    3. 2.3  Power Requirements
      1. 2.3.1 Power Tree
      2. 2.3.2 Power Sequence
    4. 2.4  Header Information
      1. 2.4.1 Baseboard Headers (J1, J2, J3)
      2. 2.4.2 HSEC Pinout
      3. 2.4.3 XDS Debug Header (J4)
      4. 2.4.4 FSI Header
      5. 2.4.5 OSPI Expansion Connector
      6. 2.4.6 Ethernet Add-on Board Connector
    5. 2.5  Reset
    6. 2.6  Clock
    7. 2.7  GPIO Mapping
    8. 2.8  Interfaces
      1. 2.8.1 USB
      2. 2.8.2 UART
      3. 2.8.3 FSI
      4. 2.8.4 OSPI
      5. 2.8.5 Ethernet
        1. 2.8.5.1 RGMII
        2. 2.8.5.2 PRU-ICSS
          1. 2.8.5.2.1 On-Board PHY
          2. 2.8.5.2.2 Ethernet Add-on Board
      6. 2.8.6 I2C
      7. 2.8.7 SPI
      8. 2.8.8 TMDSHSECDOCK-AM263 Peripherals
        1. 2.8.8.1 ADC/DAC
        2. 2.8.8.2 MCAN
        3. 2.8.8.3 LIN1
        4. 2.8.8.4 JTAG
        5. 2.8.8.5 GPIO
    9. 2.9  Debug Information
    10. 2.10 Test Points
    11. 2.11 Assembly Instructions
    12. 2.12 Best Practices
  8. 3Software
  9. 4Hardware Design Files
  10. 5Additional Information
    1. 5.1 Trademarks
  11. 6References
    1. 6.1 Other TI Components Used in This Design
  12. 7Revision History

2.8.3 FSI

The AM261x SOM to HSEC adapter provides a 10-pin header for interfacing with the AM261x MCU Fast Serial Interface (FSI) peripheral. The interface has two lines of data and a clock line for both the receive and transmit signals.

HSEC180ADAPEVM-AM2 HSEC180ADAPEVM-AM2 FSI Interface Figure 2-11 HSEC180ADAPEVM-AM2 FSI Interface

The FSIRX signals are passed through a resistor mux, routing the FSIRX signals to either the dedicated FSI header (J8) or the HSEC connector. The FSITX signals are directly connected to the dedicated FSI header (J8)

Note: On the AM261x controlSOM, FSI TX signals go through a 4-bit 1:2 signal routing mux. There is a pull-down resistor on the select line of the mux, which does not route FSI as the default selection. To use FSI, the SPI0/FSITX0_MUX_SEL GPIO from the IO expander must be configured as a logic high output. In addition, the FSI RX signals go through a separate 4-bit 1:2 signal routing mux. There is a pull-down resistor on the select line of the mux, which does not route FSI as the default selection. To use FSI, the PMIC_SPI1/FSIRX0_MUX_SEL GPIO from the IO expander must also be configured as a logic high output.