hb28j128mm3 Renesas Electronics Corporation., hb28j128mm3 Datasheet - Page 19

• Manufacturer Part Number: hb28j128mm3
• Description: Multimediacard 32 Mbyte/64 Mbyte/128 Mbyte/256 Mbyte/512 Mbyte
• Manufacturer: Renesas Electronics Corporation.

HB28K032/L064/J128/J256/J512MM3, HB28K032/L064/J128/J256RM3
A 5 bit binary coded value is used for calculating the size of the erasable unit of these Renesas
MultiMediaCards. The parameter ERASE_GRP_MULT is permanently assigned to the value 0x0F. See
ERASE_GRP_SIZE section for detailed description.
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.
The value is set to ‘1’, meaning group write protection is enabled.
Set by the card manufacturer and defines the ECC code which is recommended to use (e.g. the device is
tested for). The value is set to ‘0’, indicating that no designated ECC is recommended.
Defines the typical block program time as a multiple of the read access time. The following table defines
the field format.
R2W_FACTOR
R2W_FACTOR
0
1
2
3
4
5
6, 7
This parameter value is 2 for these Renesas MultiMediaCards.
Rev.0.02, Sep.15.2004, page 19 of 89
ERASE_GRP_MULT
WP_GRP_SIZE
WP_GRP_ENABLE
DEFAULT_ECC
R2W_FACTOR
Multiples of read access time
1
2 (write half as fast as read)
4
8
16
32
Reserved