DDR

Table of Contents

• Features Supported
• SysConfig Features
• Features not Supported
• Creating your own DDR config file
  • Step 1: Generate a DDR config file for your EVM
  • Step 2: Add the generated DDR config file to your project
• Creating your own LPDDR config file
  • Step 1: Generate a LPDDR config file for your EVM
  • Step 2: Add the generated LPDDR config file to your project
• Important Usage Guidelines
• Usage Overview
• Example Usage
• API

The DDR driver provides API to configure the DDR module.

Features Supported

• Ability to enable/disable DDR support in your application
• Ability to specify the DDR config generated using the "DDR SUBSYSTEM REGISTER CONFIGURATION" tool
• Ability to enable/disable inline ECC (1b and 2b) in the application
• Add regions for enabling inline ECC

SysConfig Features

Note

It is strongly recommend to use SysConfig where it is available instead of using direct SW API calls. This will help simplify the SW application and also catch common mistakes early in the development cycle.

• Ability to specify the DDR config generated using the "DDR SUBSYSTEM REGISTER CONFIGURATION" tool
• Enables DDR, EMIF module clock when DDR module is selected
• Toggle inline ECC functionality
• Add regions for which inline ECC needs to be enabled

Features not Supported

NA

Creating your own DDR config file

Step 1: Generate a DDR config file for your EVM

• Goto https://dev.ti.com/sysconfig
• Select "Software Product" as "DDR SUBSYSTEM REGISTER CONFIGURATION"
• Select "Device" of interest, AM64X in this case.

DDR SUBSYSTEM REGISTER CONFIGURATION Tool

• Configure the DDR parameters using the tool
• Save the generated board_ddrReginit.h in your project workspace or work area

Configure and save the generated file

Step 2: Add the generated DDR config file to your project

• Open SysConfig (Using SDK with SysConfig) for your project
• Add "DDR" as shown below

Add DDR via SysConfig

• Specify the path to the generated board_ddrReginit.h file including the filename in the sysconfig text box as shown above
  • Make sure to use forward slash "/" in the file path so that this will work with linux as well as windows build
  • Make sure that path to this is file set in your application include path, as needed.
• Save the sysconfig project and build your application

Creating your own LPDDR config file

Step 1: Generate a LPDDR config file for your EVM

• Goto https://dev.ti.com/sysconfig
• Select "Software Product" as "DDR SUBSYSTEM REGISTER CONFIGURATION"
• Select "Device" of interest, AM64X in this case.

DDR SUBSYSTEM REGISTER CONFIGURATION Tool

• Configure the LPDDR parameters using the tool
• Save the generated board_ddrReginit.h in your project workspace or work area. Rename the file as "board_lpddrReginit.h".

Configure and save the generated file

Step 2: Add the generated LPDDR config file to your project

• Open SysConfig (Using SDK with SysConfig) for your project
• Add "DDR" as shown below

Add DDR via SysConfig

• Specify the path to the generated board_lpddrReginit.h file including the filename in the sysconfig text box as shown above
  • Make sure to use forward slash "/" in the file path so that this will work with linux as well as windows build
  • Make sure that path to this is file set in your application include path, as needed.
• Save the sysconfig project and build your application

Important Usage Guidelines

• Please read the application note https://www.ti.com/lit/pdf/spracu1 for projects having own board design with DDR.
• Ideally DDR should be enabled in the bootloader application and the SDK bootloader by default enables DDR by default.

Usage Overview

Include the below file to access the APIs

#include <stdio.h>
#include <drivers/ddr.h>
 
/* DDR register config .h file as generated from DDR SUBSYSTEM REGISTER CONFIGURATION tool
 * Make sure path to this file is specified in your application project/makefile include path
 */
#include "drivers/ddr/v0/soc/am64x_am243x/board_ddrReginit.h"
 
static DDR_Params gDdrParams =
{
    /* below values are set using the globals defined in drivers/ddr/v0/soc/am64x_am243x/board_ddrReginit.h */
    .clk1Freq              = DDRSS_PLL_FREQUENCY_1,
    .clk2Freq              = DDRSS_PLL_FREQUENCY_2,
    .ddrssCtlReg           = DDRSS_ctlReg,
    .ddrssPhyIndepReg      = DDRSS_phyIndepReg,
    .ddrssPhyReg           = DDRSS_phyReg,
    .ddrssCtlRegNum        = DDRSS_ctlRegNum,
    .ddrssPhyIndepRegNum   = DDRSS_phyIndepRegNum,
    .ddrssPhyRegNum        = DDRSS_phyRegNum,
    .ddrssCtlRegCount      = DDRSS_CTL_REG_INIT_COUNT,
    .ddrssPhyIndepRegCount = DDRSS_PHY_INDEP_REG_INIT_COUNT,
    .ddrssPhyRegCount      = DDRSS_PHY_REG_INIT_COUNT,
    .fshcount              = DDRSS_PLL_FHS_CNT,
    .enableEccFlag = 0,
    .eccRegion = NULL,
};

Initialize DDR

    DDR_init(&gDdrParams);

Example Usage

NA

API

APIs for DDR