SanDisk SD Card

Revision 2.2Chapter 3 – SD Card Interface DescriptionSD Card Product Manual• DSR_IMP—defines if the configurable driver stage is integrated on the card. If set, aDriver Stage Register (DSR) must also be implemented.Table 3-20 DSR Implementation Code TableDSR_IMP0 No DSR implementedDSR Type1 DSR implemented• C_SIZE (Device Size)—computes the card capacity. The memory capacity of the cardis computed from the entries C_SIZE, C_SIZE_MULT and READ_BL_LEN asfollows:memory capacity = BLOCKNR * BLOCK_LENWhere:BLOCKNR = (C_SIZE+1) * MULTMULT = 2 C_SIZE_MULT+2 (C_SIZE_MULT < 8)BLOCK_LEN = 2 READ_BL_LEN (READ_BL_LEN < 12)Therefore, the maximum capacity that can be coded is 4096*512*2048=4 GB. Forexample, a 4-MB 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—minimum values for read and writecurrents at the VDD power supply are coded in Table 3-21.Table 3-21 V DD Minimum Current ConsumptionVDD_R_CURR MINCode for Current Consumption @ V DDVDD_W_CURR MIN2:0 0=0.5 mA, 1=1 mA, 2=5 mA, 3=10 mA, 4=25 mA, 5=35 mA, 6=60 mA, 7=100mA• VDD_R_CURR_MAX, VDD_W_CURR_MAX—maximum values for read andwrite currents on VDD power supply are coded Table 3-22.Table 3-22 V DD Maximum Current ConsumptionVDD_R_CURR MAXCode for Current Consumption @ V DDVDD_W_CURR MAX2:0 0=1 mA, 1=5 mA, 2=10 mA, 3=25 mA, 4=35 mA, 5=45 mA, 6=80 mA, 7=200mA• C_SIZE_MULT (Device Size Multiplier)—codes a factor MULT for computing thetotal device size (see C_SIZE). The factor MULT is defined as 2 C_SIZE_MULT+2 .© 2004 SanDisk Corporation 3-17 12/08/04