SanDisk SDSDB-32-201-80 - Industrial Grade Flash Memory Card Product Manual page 42

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:
Where:
BLOCKNR = (C_SIZE+1) * MULT
C_SIZE_MULT+2
MULT = 2
BLOCK_LEN = 2
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.
VDD_R_CURR_MIN
VDD_W_CURR_MIN
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.
VDD_R_CURR_MAX
VDD_W_CURR_MAX
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
SanDisk Secure Digital (SD) Card Product Manual, Rev. 1.9 © 2003 SANDISK CORPORATION
1
memory capacity = BLOCKNR * BLOCK_LEN
(C_SIZE_MULT < 8)
READ_BL_LEN
(READ_BL_LEN < 12)
Table 3-17. V Minimum Current Consumption
DD
2:0 0=0.5mA; 1=1mA; 2=5mA; 3=10mA; 4=25mA; 5=35mA;
6=60mA; 7=100mA
Table 3-18. V Maximum Current Consumption
DD
2:0 0=1mA; 1=5mA; 2=10mA; 3=25mA; 4=35mA;
5=45mA; 6=80mA; 7=200mA
Table 3-19. Multiply Factor For The Device Size
C_SIZE_MULT
0
1
2
3
4
5
6
7
DSR implemented
Code For Current Consumption @ V
Code For Current Consumption @ V
C_SIZE_MULT+2
.
MULT
2 2 = 4
2 3 = 8
2 = 16
4
2 5 = 32
2 6 = 64
2 = 128
7
2 8 = 256
2 = 512
9
SD Card Interface Description
DD
DD
3-17