For the DDR2 SDRAM "ODT Setting" in the configuration window of mpmc or "C_MEM_ODT_TYPE" in MHS, I can select from "Disabled", 75Ohm, 150Ohm, 50Ohm. In testing, the ODT setting is implemented incorrectly; the 75Ohm and 150Ohm settings are switched. How do I resolve this issue?
Solution
This issue is caused by an incorrect mapping in verilog module "s6_phy_top.v": localparam P_MEM_DDR2_RTT = (C_MEM_ODT_TYPE == 0) ? "OFF" : (C_MEM_ODT_TYPE == 1) ? "150OHMS" : (C_MEM_ODT_TYPE == 2) ? "75OHMS" : "50OHMS"; Which should be set as: localparam P_MEM_DDR2_RTT = (C_MEM_ODT_TYPE == 0) ? "OFF" : (C_MEM_ODT_TYPE == 1) ? "75OHMS" : (C_MEM_ODT_TYPE == 2) ? "150OHMS" : "50OHMS"; To work around this issue, set 75Ohm for 150Ohm and 150Ohm for 75Ohm as the desired setting. This issue is scheduled to be fixed in EDK 13.1 and later.