[oc] How to solution error messages with Memory Controller IP Core !

[vincent@mail.acard.com]

I simulated the Memory Controller IP Core with sdram module,
sram module and Flash module.
The error messages are shown below.
Can you help me to find the problems?
Please tell me some suggestions.
Thank you!
Mode: 00000000 
ERROR: Data[0] Mismatch: Expected: xxxx0000, Got: xxxxzzzz (16075.0 
ns) 
ERROR: Data[1] Mismatch: Expected: xxxx0001, Got: xxxxzzzz (16075.0 
ns) 
ERROR: Data[2] Mismatch: Expected: xxxx0002, Got: xxxxzzzz (16075.0 
ns) 
ERROR: Data[3] Mismatch: Expected: xxxx0003, Got: xxxxzzzz (16075.0 
ns) 
ERROR: Data[0] Mismatch: Expected: xxxx0000, Got: xxxxzzzz (43035.0 
ns) 
ERROR: Data[1] Mismatch: Expected: xxxx0001, Got: xxxxzzzz (43035.0 
ns) 
ERROR: Data[2] Mismatch: Expected: xxxx0002, Got: xxxxzzzz (43035.0 
ns) 
ERROR: Data[3] Mismatch: Expected: xxxx0003, Got: xxxxzzzz (43035.0 
ns) 
ERROR: Data[4] Mismatch: Expected: xxxx0004, Got: xxxxzzzz (43035.0 
ns) 
ERROR: Data[5] Mismatch: Expected: xxxx0005, Got: xxxxzzzz (43035.0 
ns) 
ERROR: Data[6] Mismatch: Expected: xxxx0006, Got: xxxxzzzz (43035.0 
ns) 
ERROR: Data[7] Mismatch: Expected: xxxx0007, Got: xxxxzzzz (43035.0 
ns) 
ERROR: Data[0] Mismatch: Expected: xxxx0000, Got: xxxxzzzz (83475.0 
ns) 
ERROR: Data[1] Mismatch: Expected: xxxx0001, Got: xxxxzzzz (83475.0 
ns) 
ERROR: Data[2] Mismatch: Expected: xxxx0002, Got: xxxxzzzz (83475.0 
ns) 
ERROR: Data[3] Mismatch: Expected: xxxx0003, Got: xxxxzzzz (83475.0 
ns) 
ERROR: Data[4] Mismatch: Expected: xxxx0004, Got: xxxxzzzz (83475.0 
ns) 
ERROR: Data[5] Mismatch: Expected: xxxx0005, Got: xxxxzzzz (83475.0 
ns) 
ERROR: Data[6] Mismatch: Expected: xxxx0006, Got: xxxxzzzz (83475.0 
ns) 
ERROR: Data[7] Mismatch: Expected: xxxx0007, Got: xxxxzzzz (83475.0 
ns)
ERROR: Data[8] Mismatch: Expected: xxxx0008, Got: xxxxzzzz (83475.0 
ns) 
ERROR: Data[9] Mismatch: Expected: xxxx0009, Got: xxxxzzzz (83475.0 
ns) 
ERROR: Data[10] Mismatch: Expected: xxxx000a, Got: xxxxzzzz 
(83475.0 ns) 
ERROR: Data[11] Mismatch: Expected: xxxx000b, Got: xxxxzzzz 
(83475.0 ns)
ERROR: Data[0] Mismatch: Expected: xxxx0000, Got: xxxxzzzz 
(137395.0 ns) 
ERROR: Data[1] Mismatch: Expected: xxxx0001, Got: xxxxzzzz 
(137395.0 ns) 
ERROR: Data[2] Mismatch: Expected: xxxx0002, Got: xxxxzzzz 
(137395.0 ns) 
ERROR: Data[3] Mismatch: Expected: xxxx0003, Got: xxxxzzzz 
(137395.0 ns) 
ERROR: Data[4] Mismatch: Expected: xxxx0004, Got: xxxxzzzz 
(137395.0 ns) 
ERROR: Data[5] Mismatch: Expected: xxxx0005, Got: xxxxzzzz 
(137395.0 ns) 
ERROR: Data[6] Mismatch: Expected: xxxx0006, Got: xxxxzzzz 
(137395.0 ns) 
ERROR: Data[7] Mismatch: Expected: xxxx0007, Got: xxxxzzzz 
(137395.0 ns) 
ERROR: Data[8] Mismatch: Expected: xxxx0008, Got: xxxxzzzz 
(137395.0 ns) 
ERROR: Data[9] Mismatch: Expected: xxxx0009, Got: xxxxzzzz 
(137395.0 ns) 
ERROR: Data[10] Mismatch: Expected: xxxx000a, Got: xxxxzzzz 
(137395.0 ns) 
ERROR: Data[11] Mismatch: Expected: xxxx000b, Got: xxxxzzzz 
(137395.0 ns) 
ERROR: Data[12] Mismatch: Expected: xxxx000c, Got: xxxxzzzz 
(137395.0 ns) 
ERROR: Data[13] Mismatch: Expected: xxxx000d, Got: xxxxzzzz 
(137395.0 ns) 
ERROR: Data[14] Mismatch: Expected: xxxx000e, Got: xxxxzzzz 
(137395.0 ns) 
ERROR: Data[15] Mismatch: Expected: xxxx000f, Got: xxxxzzzz 
(137395.0 ns)
 
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