SDRAM (Blackfin HPPCI ICE)

Hello,

We designed the target board with ADSP-21532s, and using HPPCI ICE to debug our code.
We connect it with 32 MB SDRAM. We have a problem about it as below.

After initialization of SDRAM, we can read/write SDRAM via code.
But we can't assign values manually via Visual DSP++ "Blackfin Memory Window".

It shows
        Data verification failed at address: 0x000600
        Expected: 0x55, Found: 0x4B
        Unable to write memory.

Any suggestion is appreciated.
Thanks in advance.

C.H.Chang