SPRADC1 june   2023 DRA829J , DRA829V , TDA4VM

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1 Different Types of Memories on the TDA4VM
  5. 2Memory Overview and Intended Usage
    1. 2.1 PSROM
      1. 2.1.1 Typical Use Cases
    2. 2.2 PSRAM
      1. 2.2.1 Typical Use Cases
    3. 2.3 MSMC RAM
      1. 2.3.1 Typical Use Cases
      2. 2.3.2 Relevant Links
    4. 2.4 MSRAM
      1. 2.4.1 Typical Use Cases
    5. 2.5 ARM Cortex A72 Subsystem
      1. 2.5.1 L1/L2 Cache Memory
      2. 2.5.2 L3 Memory
      3. 2.5.3 Relevant Links
    6. 2.6 ARM Cortex R5F Subsystem
      1. 2.6.1 L1 Memory System
      2. 2.6.2 Cache
      3. 2.6.3 Tightly Coupled Memory (TCM)
      4. 2.6.4 Typical Use Case
      5. 2.6.5 Relevant Links
    7. 2.7 TI's C6x Subsystem
      1. 2.7.1 Memory Layout
      2. 2.7.2 Relevant Links
    8. 2.8 TI's C7x Subsystem
      1. 2.8.1 Memory Layout
      2. 2.8.2 Relevant Links
    9. 2.9 DDR Subsystem
      1. 2.9.1 Relevant Links
  6. 3Performance numbers
    1. 3.1 SDK Data Sheet
    2. 3.2 Memory Access Latency
  7. 4Software Careabouts When Using Different Memories
    1. 4.1 How to Modify Memory Map for RTOS Firmwares
    2. 4.2 DDR Sharing Between RTOS Core and HLOS
    3. 4.3 MCU On-Chip RAM Usage by Bootloader
    4. 4.4 MSMC RAM Default SDK Usage
      1. 4.4.1 MSMC RAM Reserved Sections
      2. 4.4.2 MSMC RAM Configuration as Cache and SRAM
    5. 4.5 Usage of ATCM from MCU R5F
    6. 4.6 Usage of DDR to Execute Code from R5F
  8. 5Summary

2.6.4 Typical Use Case

Hot data and code with poor locality can be placed in the TCM for the best performance. The TCMs are sometimes loaded with some boot-up code to initialize the R5F Memory Protection Unit (MPU) to further execute code out of DDR. Because some applications do not cache well, there are two TCM interfaces that permit connection to configurable memory blocks of Tightly-Coupled Memory (ATCM and BTCM). ATCM is usually used for code and the dual ported BTCM for data.

  • An ATCM typically holds interrupt or exception code that must be accessed at high speed, without any potential delay resulting from a cache miss.
  • A BTCM typically holds a block of data for intensive processing, such as audio or video processing. BTCM is dual ported to increase bandwidth.
  • The TCMs are external to the processor. This provides flexibility in optimizing the TCM subsystem for performance, power, and RAM type.
GUID-20230519-SS0I-7PSQ-VHBQ-SHFRNZSN09PR-low.svg Figure 2-3 R5FSS Block Diagram