HB288032MM1 Datasheet, PDF (15/80 Pages) Hitachi Semiconductor – MultiMediaCard 32 MByte

HB288032MM1
• DSR_IMP
Defines if the configurable driver stage option is integrated on the card or not. If implemented a driver
stage register (DSR) must be implemented also.
DSR Implementation
DSR_IMP
0
1
DSR type
no DSR implemented
DSR implemented
The HB288032MM1 output drivers are not configurable. The parameter DSR_IMP is permanently
assigned to the value ‘0’.
• C_SIZE
This parameter is used to compute the card capacity. The memory capacity of the card is computed from
the entries C_SIZE, C_SIZE_MULT and READ_BLK_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_BLK_LEN (READ_BLK_LEN < 12)
Therefore, the maximal capacity which can be coded is 4096*512*512 = 1 GBytes.
Example: A 32 MBytes card with BLOCK_LEN = 512 can be coded with C_SIZE_MULT = 3 and
C_SIZE = 1959.
The card capacity is 32 MBytes.
The value of the parameter C_SIZE used in the formula above for the HB288032MM1 is 0x7A7.
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