Copy back operation is not working in NAND Flash

Now I'm able to get the Copy-back complete interrupt.But data is not copied from source to destination address.

I have written some value manually to source block and when i read back the values in destination block ,its 0xFF.

Below code command i used for copy-back operation :

OUTREG32(g_pNandData,0x08000000 | (srcBlkNum << 7) | 0x0);

OUTREG32(g_pNandData+0x10,0x1000);

OUTREG32(g_pNandData,0x08000000 | (dstBlkNum << 7) | 0x0);

OUTREG32(g_pNandData + 0x10,(0x1100 | iNumPages));

What i am missing in this commands??

note:

g_pNandData - Data memory(1 MB)

srcBlkNum - source block address to be copied.

dstBlkNum - Destination block address.

iNumPages - number of pages need to be copied

Regards,

Surendran