SPRADC3 june   2023 AM2431 , AM2432 , AM2434 , AM2631 , AM2631-Q1 , AM2632 , AM2632-Q1 , AM2634 , AM2634-Q1 , AM263P4 , AM3351 , AM3352 , AM3354 , AM3356 , AM3357 , AM3358 , AM3358-EP , AM3359 , AM4372 , AM4376 , AM4377 , AM4378 , AM4379 , AM5706 , AM5708 , AM5716 , AM5718 , AM5718-HIREL , AM5726 , AM5728 , AM5729 , AM5746 , AM5748 , AM5749 , AM6411 , AM6412 , AM6421 , AM6422 , AM6441 , AM6442 , AM6526 , AM6528 , AM6546 , AM6548

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction to 8b-10b Line Coding
  5. 2PRU Implementation for Data Transmitting and Receiving
    1. 2.1 Encoding and Decoding Data
    2. 2.2 PRU Module Interface and GPIO Mode
    3. 2.3 PRU GPIO Shift-out and Shift-in Mode for Communication
    4. 2.4 Three-channel Peripheral Interface for Communication
    5. 2.5 LVDS and M-LVDS Interface
  6. 3System Solution With CRC Module and Over-head Optimization
    1. 3.1 PRU CRC16/32 Module
    2. 3.2 Encode and Decode Over-head Optimization
  7. 4Verification
  8. 5Summary
  9. 6References

Abstract

In industrial motor drive systems, multiple devices or chips are often required to communicate with each other in a quick speed, low-jitter, low-latency, and synchronized manner. The typical example application is intra drive communications with either standard interface (like serial peripheral interface) or custom protocols in physical layer (like 8b-10b line code).

Programmable Real-time Unit (PRU) is unique because it can execute single-cycle functions with 960-bit-wide data bus which results in no jitter for the user in real-time execution of communication and control applications. TI Sitara™ processors offer two types of PRU subsystems: PRU-ICSS and PRU_ICSSG. PRU-ICSS is available for the AM335x, AM437x and AM57x series. PRU_ICSSG is available on the AM243x, AM65x and AM64x.

This application note describes how to use PRU to implement 8b-10b line coding for intra drive communication with 100Mbps data rate. This document also introduces Low-voltage Differential Signaling (LVDS) and Multipoint Low Voltage Differential Signaling (M-LVDS) interfaces for high-speed signaling.