SD Card Interface Description
SanDisk Secure Digital (SD) Card Product Manual, Rev. 1.9 © 2003 SANDISK CORPORATION
3-17
1 DSR
implemented
C_SIZE (Device Size)
—This parameter is used to compute the card capacity (does not include security protected
area). The memory capacity of the card is computed from the entries C_SIZE, C_SIZE_MULT and
READ_BL_LEN as follows:
memory capacity = BLOCKNR * BLOCK_LEN
Where:
BLOCKNR = (1) * MULT
MULT = 2
C_SI2
(C_SIZE_MULT < 8)
BLOCK_LEN = 2
READ_BL_LEN
(READ_BL_LEN < 12)
Therefore, the maximum capacity which can be coded is 4096*512*2048 = 4 GBytes. Example: A four MByte card
with BLOCK_LEN = 512 can be coded with C_SIZE_MULT = 0 and C_SIZE = 2047.
VDD_R_CURR_MIN, VDD_W_CURR_MIN
—The maximum values for read and write currents at the minimal
VDD power supply are coded in Table 3-17.
Table 3-17. V
DD
Minimum Current Consumption
VDD_R_CURR_MIN
VDD_W_CURR_MIN
Code For Current Consumption @ V
DD
2:0
0=0.5mA; 1=1mA; 2=5mA; 3=10mA; 4=25mA; 5=35mA;
6=60mA; 7=100mA
VDD_R_CURR_MAX, VDD_W_CURR_MAX
—The maximum values for read and write currents at the
maximum VDD power supply are coded Table 3-18.
Table 3-18. V
DD
Maximum Current Consumption
VDD_R_CURR_MAX
VDD_W_CURR_MAX
Code For Current Consumption @ V
DD
2:0
0=1mA; 1=5mA; 2=10mA; 3=25mA; 4=35mA;
5=45mA; 6=80mA; 7=200mA
C_SIZE_MULT (Device Size Multiplier)
—This parameter is used for coding a factor MULT for computing the
total device size (see ‘C_SIZE’). The factor MULT is defined as 2
C_SI2
.
Table 3-19. Multiply Factor For The Device Size
C_SIZE_MULT MULT
0 2
2
= 4
1 2
3
= 8
2 2
4
= 16
3 2
5
= 32
4 2
6
= 64
5 2
7
= 128
6 2
8
= 256
7 2
9
= 512
