Hello Champs,
Customer designed his own C6657 board, but it failed in DDR3 leveling test.
It prompted "DDR3 leveling has failed，STATUS = 0x40000064"
1. Customer ensured the DDR configuration in PHY Calc excel are all correct.
2. Some boards failed, some boards were ok.
When DDR3 leveling failed, the peak to peak for 0.75v VTT can reach max. 20mv, when DDR3 leveling passed, the peak to peak for 0.75v VTT is correct (about several mV).
sprabi1c- DDR3 design requirements for Keystone Device
Questions:
1. Does the VTT voltage cause the DDR Leveling time out?
2. What range of VTT is allowed for DDR leveling?
Thanks.
Rgds
Shine
