AM3352: About default EMIF parameter

Hi Nishigata-san,
It seems the last change on MT47H128M16RT-25E DDR parameters was done a while back in this commit ID
git.ti.com/gitweb
Best,
-Hong

Hi, Hong
Thanks for the answer.

I was misunderstanding the situation.
I gave the customer the EMIF spreadsheet. They tried to run the calculations on a sample MT47H128M16RT-25E, but the values are different from what is written in u-boot/ddr_defs.h.
Regarding this, they are using a different RAM (W9751G6KB-25) and they are having trouble determining if the values to the EMIF registers calculated in this spreadsheet are correct.
Can the values noted in the header file be calculated in this spreadsheet as well? Or has something changed in the parameters, etc.?

Best Regards,

Kouji Nishigata

Hi Nishigata-san,

AM335x DDR configuration tool user guide and the package are accessible from:
www.ti.com/.../SPRACK4
https://www.ti.com/lit/zip/SPRCAJ0

From the DDR configuration tool user guide Section 2.2.6 u-boot:
"The u-boot tab provides code fragments to be used in u-boot for DDR DPLL, controller, and PHY configuration. The structures should be placed in <u-boot>/board/ti/am335x/board.c to define the appropriate parameters for your board design. The config_ddr() function calls the DDR initialization routine
with pointers to the DDR parameters for your design. The get_dpll_ddr_params() function should return a pointer to the DPLL_DDR parameters. It gets called by setup_dplls(), which subsequently uses that structure to configure DPLL_DDR."

Best,
-Hong

Hi, Hong

Thanks for the response.
But the answer seems to be off.
They are unable to determine if the value to be set is correct, not about where to set it, etc.
I used AM335x_DDR_register_calc_tool to create the parameters to the EMIF for the MT47H128M16RT-25E and the values are different from the values in ddr_defs.h.
Because of this, they cannot determine if the parameters they created are correct for the RAM they are using (W9751G6KB-25) as well.
Perhaps the spreadsheet is wrong, or the parameters set by the customer are wrong, or the values in ddr_defs.h are wrong, do you know which is the cause?
I am attaching a spreadsheet with the customer's MT47H128M16RT-25E calculations.

Best Regards,

Kouji Nishigata

AM335x_DDR_register_calc_tool_Custermer_data.zip

Kouji, the values in ddr_defs.h may not be optimal or may not match the spreadsheet because some optimizations were done to the spreadsheet after the code was frozen.  

I checked the spreadsheet and it looks correct for the Micron device.  If they are using a different device, the spreadsheet should be based off of that device's datasheet.  

Regards,

James

Hi, James

Thanks for your answer.
Thanks for having a look at the spreadsheet.
I will let the customer know that the spreadsheet looks fine to use.
In the meantime, would it be possible to have a look at the spreadsheet on the device the customer is using (W9751G6KB-25)?

AM335x_DDR_register_calc_tool_W9751G6KB-25.zipw9751g6kb_a09_20170123-1489769.zip

Best Regards,

Kouji Nishigata

Hi, James

Thanks for reviewing the spreadsheet.
We have had our customers actually set up their boards to confirm that the problem has not reoccurred with the frequency we have seen so far.

Best Regards,

Kouji Nishigata