AM3352: DDR3 configuration

Note the clock value is 24Mhz .

Did you follow all steps in the procedure as detailed here: processors.wiki.ti.com/.../Sitara_Linux_Training:_Tuning_the_DDR3_Timings_on_BeagleBoneBlack

Hi Biser,

Yes we did follow the procedures detailed in the DDR3 timing on beagleboard reference link.


Regards,
Manu.

How did you reach the conclusion that the DDR is running at 100MHz? DDR3 memories cannot operate at frequencies <303MHz.

Hi Biser,

We have connected the AM3352 via Blackhawk usb 560V2 emulator and in the gel file DDR_PLL_Config( CLKIN, 23, 100, 1); when set we see

***************************************************************
The Slave Ratio Search Program Values are...
***************************************************************
PARAMETER MAX | MIN | OPTIMUM | RANGE
***************************************************************
DATA_PHY_RD_DQS_SLAVE_RATIO 0x072 | 0x003 | 0x03a | 0x06f
DATA_PHY_FIFO_WE_SLAVE_RATIO 0x3ff | 0x000 | 0x1ff | 0x3ff
DATA_PHY_WR_DQS_SLAVE_RATIO 0x078 | 0x00a | 0x041 | 0x06e
DATA_PHY_WR_DATA_SLAVE_RATIO 0x0b6 | 0x046 | 0x07e | 0x070
***************************************************************
rd_dqs_range = 0
fifo_we_range = 0
wr_dqs_range = 0
wr_data_range = 0

Optimal values have been found!!

***************************************************************
The Slave Ratio Search Program Values are...
***************************************************************
PARAMETER MAX | MIN | OPTIMUM | RANGE
***************************************************************
DATA_PHY_RD_DQS_SLAVE_RATIO 0x072 | 0x003 | 0x03a | 0x06f
DATA_PHY_FIFO_WE_SLAVE_RATIO 0x3ff | 0x000 | 0x1ff | 0x3ff
DATA_PHY_WR_DQS_SLAVE_RATIO 0x078 | 0x00a | 0x041 | 0x06e
DATA_PHY_WR_DATA_SLAVE_RATIO 0x0b6 | 0x046 | 0x07e | 0x070
***************************************************************

===== END OF TEST =====

for all other values like DDR_PLL_Config( CLKIN, 23, 303, 1) or DDR_PLL_Config( CLKIN, 23, 400, 1) the output is

***************************************************************
The Slave Ratio Search Program Values are...
***************************************************************
PARAMETER MAX | MIN | OPTIMUM | RANGE
***************************************************************
DATA_PHY_RD_DQS_SLAVE_RATIO 0x000 | 0x000 | 0x000 | 0x000
DATA_PHY_FIFO_WE_SLAVE_RATIO 0x000 | 0x000 | 0x000 | 0x000
DATA_PHY_WR_DQS_SLAVE_RATIO 0x000 | 0x000 | 0x000 | 0x000
DATA_PHY_WR_DATA_SLAVE_RATIO 0x000 | 0x000 | 0x000 | 0x000
***************************************************************

===== END OF TEST =====

Kindly advice.


Regards,
Manu.

It looks like you may have some issues with your memory setup. Please follow the recommendations in the link Biser shared earlier and share your GEL file/configuration that you arrived at for the tests:

You can use this spread sheet to configure your timing registers. This spreadsheet is provided so you can tune the settings based on your preferred memory - processors.wiki.ti.com/.../AM335x_DDR_register_calc_tool.zip

If you have done all the checks, some other aspects to look at:
- Verify if the schematic is correct.
- All the AM335x power supplies are in valid operating range including the DDR memory. Pay special attention to VREF and VTT (if you have one)
- check if the device is out of reset, DDR3 memory has RESET# go low and high
- All the DDR3 layout rules in the AM335x data sheet have been followed

Regards, Siva