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有關MCHPMSD中之typedefs.h file內 CSD 之定義bit-fields
部分似乎順序顛倒 bit-fields 存放是由low bit 往hi bit 放
但文中是由hi bit 往low bit放
如果MSD.c中void MSDReadCapacityHandler()之
C_Read_Bl_Len=gblCSDReg._byte[5]&0x0f;
gblBLKLen._dword=one<<C_Read_Bl_Len;

// Get the number of blocks using C_size and C_mult
C_size_U=gblCSDReg._byte[6]&0x03; // 2 LSB bits
C_size_H=gblCSDReg._byte[7];
C_size_L=(gblCSDReg._byte[8]&0xC0)>>6; // 2 MSB, right shift by 6places
// to get in LSB
C_size=(C_size_U<<10)|(C_size_H<<2)|(C_size_L);
C_mult_H=gblCSDReg._byte[9]&0x03;
C_mult_L=(gblCSDReg._byte[10]&0x80)>>7;
C_mult=(C_mult_H<<1)|C_mult_L;
Mult = one<<(C_mult+2);
gblNumBLKS._dword=Mult*(C_size+1)-1; // last LBA is noLBAs-1
改由gblCSDReg.C_SIZE_U
gblCSDReg.C_SIZE_H
gblCSDReg.C_SIZE_L
gblCSDReg.C_SIZE_MULT_L
gblCSDReg.C_SIZE_MULT_L
則C_size 會得到錯誤值
或用watch 觀察gblCSDReg.C_SIZE_U
gblCSDReg.C_SIZE_H
gblCSDReg.C_SIZE_L
gblCSDReg.C_SIZE_MULT_L
gblCSDReg.C_SIZE_MULT_L
再經計算會得到錯誤C_size 值
以下為修改部分
struct
{

//0
unsigned SPEC_VERS_4 :4; //CSD-Slice b123 downto b120
unsigned RESERVED_C_2 :2; //CSD-Slice b125 downto b124
unsigned CSD_STRUCTURE_2 :2; //CSD-Slice b127 downto b126

//1
unsigned TAAC_8 :8; //CSD-Slice b119 downto 112

//2
unsigned NSAC_8 :8; //CSD-Slice b111 downto b104

//3
unsigned TRAN_SPEED_8 :8; //CSD-Slice b103 downto b96

//4
unsigned CCC_H_8 :8; //CSD-Slice b95 downto b88

//5
unsigned READ_BL_LEN_4 :4; //CSD-Slice b83 downto b80

unsigned CCC_L_4 :4; //CSD-Slice b87 downto b84

//6
//unsigned C_SIZE_H :4; //CSD-Slice b73 downto b70
unsigned C_SIZE_U_2 :2; //CSD-Slice b73 downto b72

unsigned RESERVED_B_2 :2; //CSD-Slice b75 downto b74
unsigned DSR_IMP_1 :1; //CSD-Slice b76
unsigned READ_BLK_MISALIGN_1 :1; //CSD-Slice b77
unsigned WRITE_BLK_MISALIGN_1 :1; //CSD-Slice b78
unsigned READ_BL_PARTIAL_1 :1; //CSD-Slice b79

//7
//unsigned C_SIZE_L :8; //CSD-Slice b69 downto b62
unsigned C_SIZE_H_8 :8; //CSD-Slice b71 downto b64

//8
unsigned VDD_R_CURR_MAX_3 :3; //CSD-Slice b58 downto b56
unsigned VDD_R_CURR_MI_3N :3; //CSD-Slice b61 downto b59

unsigned C_SIZE_L_2 :2; //CSD-Slice b63 downto b62

//9
//unsigned C_SIZE_MULT :3; //CSD-Slice b49 downto b47
unsigned C_SIZE_MULT_H_2 :2; //CSD-Slice b49 downto b48

unsigned VDD_W_CURR_MAX_3 :3; //CSD-Slice b52 downto b50
unsigned VDD_W_CUR_MIN_3 :3; //CSD-Slice b55 downto b53

//10
//unsigned SECTOR_SIZE :7; //CSD-Slice b45 downto b39
unsigned SECTOR_SIZE_H_6 :6; //CSD-Slice b45 downto b40

unsigned ERASE_BLK_EN_1 :1; //CSD-Slice b46

unsigned C_SIZE_MULT_L_1 :1; //CSD-Slice b47

//11
unsigned WP_GRP_SIZE_7 :7; //CSD-Slice b38 downto b32

unsigned SECTOR_SIZE_L_1 :1; //CSD-Slice b39

//12
//unsigned WRITE_BL_LEN :4; //CSD-Slice b25 downto b22
unsigned WRITE_BL_LEN_H_2 :2; //CSD-Slice b25 downto b24

unsigned R2W_FACTOR_3 :3; //CSD-Slice b28 downto b26
unsigned DEFAULT_ECC_2 :2; //CSD-Slice b30 downto b29
unsigned WP_GRP_ENABLE_1 :1; //CSD-Slice b31

//13
unsigned RESERVED_A_5 :5; //CSD-Slice b20 downto b16
unsigned WRITE_BL_PARTIAL_1 :1; //CSD-Slice b21

unsigned WRITE_BL_LEN_L_2 :2; //CSD-Slice b23 downto b22

//14
unsigned ECC_2 :2; //CSD-Slice b9 downto b8
unsigned FILE_FORMAT_2 :2; //CSD-Slice b11 downto b10
unsigned TMP_WRITE_PROTECT_1 :1; //CSD-Slice b12
unsigned PERM_WRITE_PROTECT_1 :1; //CSD-Slice b13
unsigned COPY_1 :1; //CSD-Slice b14
unsigned FILE_FORMAT_GRP_1 :1; //CSD-Slice b15

//15
unsigned NOT_USED_1 :1; //CSD-Slice b0
unsigned CRC_7 :7; //CSD-Slice b7 downto b1
};
} CSD;
對不起 太長了
請指教 謝謝