DDR Memory Initialization

lyf sci

Hi Experts,

In case of LPDDR is used instead of the DDR2 memory in custom board with AM335x, whether there needs to be change in the DDR initialization procedure or the default will itself work ?

I am using Linux SDK 7.0

Regards,

Lyf

over 9 years ago

0 Brad Griffis over 9 years ago

TI__Guru*** 125430 points

The initialization process is basically the same. Mainly it's just the register values that change. One thing that I don't recall off the top of my head is if the ddr_io_ctrl register gets touched by the intialization process. For LPDDR you need to be sure to set bit 28 of that register to one.

There's also a spreadsheet here for configuring the PHY registers appropriately:

http://processors.wiki.ti.com/index.php/AM335x_EMIF_Configuration_tips#DDR_PHY_Registers_for_DDR2_and_LPDDR_.28mDDR.29

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DDR Memory Initialization