MIG v3.3 allows the following drive strengths to be selected for the Spartan-6 FPGA LPDDR design:
There are two issues with these settings:
This issue is Fixed in ISE Version 12.1.
To work around this issue, you need to manually change the Cx_MEM_MDDR_ODS parameter to the appropriate value.
Open the top-level module ("example_design/rtl/example.top.v/vhd" or the "user_design/rtl/<comp_name>.v/vhd") and locate the Cx_MEM_MDDR_ODS parameters.
There is a unique parameter for each controller in the MIG design.
Change the "FULL" setting to the desired output drive strength.
The supported settings are: