66AK2G12: EVMK2GX_DDR3/EMIF Data rate

Hi Jeff

I am working on "Keystone-II DDR3 Register Calculations" sheet provided by TI for DDR3 registers. DDR3 Memory Device(MT41K512M8DA-107) used in EVMK2GX is not available in drop down list.

How can I fill the datasheet timing values in this sheet? As per my understanding, timing values will be with respect to the device speed. 1866MT/s speed is not available in the sheet.

Regards

Srikanth Kacchu

Hi Team

Anybody please respond to my query.

Regards

Srikanth Kacchu

Hello, if the device is not in the drop down box you will need to use the "User Defined" and set it up for slower speed.  Please keep in mind that K2G only supports up to 1066 MT/s so your clock will be 533MHz.  

Hi Jeff

Yes, if the device is not in the drop down list, we have to use the " User defined".

Can I copy the timing values of DDR3 chip datasheet with 1866MT/s to the excel sheet for register calculation?

Regards

Srikanth Kacchu

The memory data manual usually has the values for lower clock speeds...for instance, the one used on the EVM has timing values for -800, -1066, -1333, -1600, -1866, and -2133.  What memory device are you using?

Hi Jeff

I edited my question after the datasheet understanding.

DDR3 part used in EVMK2GX is MT41K512M8DA-107. It supports -800, -1066, -1333, -1600, -1866 and -2133MT/s as you mentioned.

But for -1066 MT/s, there are two different values of CL-tRCD-tRP are provided(7-7-7 and 8-8-8) based on which the timing values are provided.

If CL-tRCD-tRP = 7-7-7, tRP is 13.125ns and if CL-tRCD-tRP = 8-8-8. tRP is 15ns.

What should I consider? Please respond as early as possible?

Regards

Srikanth Kacchu