What do you mean by "see the address of DDR memory"?
You write to a known location of the DDR3 using the MIG interface and then read back from the same address. If if get back the data you have written, your design is functioning.
Are you using a MIG with AXI interface? Well then the AXI response channels (B*/R*) will also indicate if handshaking was successfully achieved or not. The 2 bit error response signal is a good indicator for the AXI interconnect.
These are the easier ways to check if the DDR is functioning properly.