SanDisk SDSDH-1024 Product Manual - Page 37

Revision 2.2 Chapter 3 - SD Card Interface Description SD Card Product Manual • DSR_IMP-defines if the configurable driver stage is integrated on the card. If set, a Driver Stage Register (DSR) must also be implemented. Table 3-20 DSR Implementation Code Table DSR_IMP 0 1 No DSR implemented DSR implemented DSR Type • C_SIZE (Device Size)-computes the card capacity. 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 = 2C_SIZE_MULT+2 BLOCK_LEN = 2READ_BL_LEN (C_SIZE_MULT < 8) (READ_BL_LEN < 12) Therefore, the maximum capacity that can be coded is 4096*512*2048=4 GB. For example, 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 write currents at the VDD power supply are coded in Table 3-21. Table 3-21 VDD Minimum Current Consumption VDD_R_CURR MIN VDD_W_CURR MIN Code for Current Consumption @ VDD 2:0 0=0.5 mA, 1=1 mA, 2=5 mA, 3=10 mA, 4=25 mA, 5=35 mA, 6=60 mA, 7=100 mA • VDD_R_CURR_MAX, VDD_W_CURR_MAX-maximum values for read and write currents on VDD power supply are coded Table 3-22. Table 3-22 VDD Maximum Current Consumption VDD_R_CURR MAX VDD_W_CURR MAX Code for Current Consumption @ VDD 2:0 0=1 mA, 1=5 mA, 2=10 mA, 3=25 mA, 4=35 mA, 5=45 mA, 6=80 mA, 7=200 mA • C_SIZE_MULT (Device Size Multiplier)-codes a factor MULT for computing the total device size (see C_SIZE). The factor MULT is defined as 2C_SIZE_MULT+2. © 2004 SanDisk Corporation 3-17 12/08/04