USR_DATA_BLOCK_SZ_OFF
prot->dw0 |= (0x1 << USR_DATA_BLOCK_SZ_OFF);
prot->dw0 |= (0x2 << USR_DATA_BLOCK_SZ_OFF);
#define USR_DATA_BLOCK_SZ_MSK (0x3 << USR_DATA_BLOCK_SZ_OFF)