Transcend Information TS1~2GUSD-S3 User Manual
Page 13
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U
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microSD Memory Card + Reader S3
Transcend Information Inc.
13
Defines if the configurable driver stage is integrated on the card. If set, a driver stage register (DSR)must be
implemented also.
•
C_SIZE
This parameter is used to compute the user’s data card capacity (not include the 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)
Maximum capacity of the card, compliant to SD Physical Specification Versoin1.01 shall be up to2G bytes (2
31
bytes) to
be consistent with the maximum capacity (2G bytes) of SD Memory Card File System Specification Ver.1.01.
To indicate 2GByte card, BLOCK_LEN shall be 1024 bytes.
Therefore, the maximal capacity which can be coded is 4096*512*1024 = 2G bytes.
Example: A 32Mbyte card with BLOCK_LEN = 512 can be coded by C_SIZE_MULT = 3 and C_SIZE = 2000.
•
VDD_R_CURR_MIN, VDD_W_CURR_MIN
The maximum values for read and write currents at the minimal power supply V
DD
are coded as follows:
•
VDD_R_CURR_MAX, VDD_W_CURR_MAX
The maximum values for read and write currents at the maximal power supply V
DD
are coded as follows:
•
C_SIZE_MULT
This parameter is used for coding a factor MULT for computing the total device size (see ‘C_SIZE’).