HB28B064MM2 RENESAS [Renesas Technology Corp], HB28B064MM2 Datasheet - Page 20

• Manufacturer Part Number: HB28B064MM2
• Description: MultiMediaCard 16 MByte/32 MByte/64 MByte/128 MByte
• Manufacturer: RENESAS [Renesas Technology Corp]

HB28H016/D032/B064/B128MM2
• C_SIZE_MULT
This parameter is used for coding a factor MULT for computing the total device size (refer to “C_SIZE”).
The factor MULT is defined as 2
Multiply Factor for the Device Size
C_SIZE_MULT
0
1
2
3
4
5
6
7
The card capacity is shown at “C_SIZE”.
• ERASE_GRP_SIZE
The contents of this register is a 5 bit binary coded value, used to calculate the size of the erasable unit of
these Hitachi MultiMediaCards. The size of the erase unit (also referred to as erase group in chapter
“Memory Array Partitioning”) is determined by the ERASE_GRP_SIZE and the ERASE_GRP_MULT
entries of the CSD, using the following equation:
The parameter ERASE_GRP_SIZE is permanently assigned to the value ‘0’. The size of erasable unit for
these Hitachi MultiMediaCards is (0+1) * (15+1) = 16, which means that the 8 kByte area can be erased in
a single erase group command (CMD35 to CMD38).
• ERASE_GRP_MULT
A 5 bit binary coded value is used for calculating the size of the erasable unit of these Hitachi
MultiMediaCards. The parameter ERASE_GRP_MULT is permanently assigned to the value 0x0F. See
ERASE_GRP_SIZE section for detailed description.
• WP_GRP_SIZE
The size of a write protection group. The content of this register is a binary coded value defining the
number of erase group. This parameter's value is 1, which means that a write protect group size is 16
kByte.
• WP_GRP_ENABLE
The value is set to ‘1’, meaning group write protection is enabled.
Rev.5.0, Jan. 2003, page 18 of 88
size of erasable unit = (ERASE_GRP_SIZE + 1) * (ERASE_GRP_MULT + 1)
MULT
2
2
2
2
2
2
2
2
2
3
4
5
6
7
8
9
= 4
= 8
= 16
= 32
= 64
= 128
= 256
= 512
C_SIZE_MULT+2
.
Remark