SanDisk SDSDB-32-201-80 - Industrial Grade Flash Memory Card Manual download pdf (Page 43)

Industrial Grade SD Card Interface Description

0 no DSR implemented

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 = (C_SIZE+1) * MULT

MULT = 2

C_SIZE_MULT+2

(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

Minimum Current Consumption

VDD_R_CURR_MIN

VDD_W_CURR_MIN

Code For Current Consumption @ V

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

Maximum Current Consumption

VDD_R_CURR_MAX

VDD_W_CURR_MAX

Code For Current Consumption @ V

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_SIZE_MULT+2

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SanDisk SDSDB-32-201-80 - Industrial Grade Flash Memory Card Manual Page 43