hb28d064mm2 Renesas Electronics Corporation., hb28d064mm2 Datasheet - Page 19

• Manufacturer Part Number: hb28d064mm2
• Description: Multimediacard 16 Mbyte/32 Mbyte/64 Mbyte/128 Mbyte
• Manufacturer: Renesas Electronics Corporation.

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 Hitachi MultiMediaCards.
The data block length is computed as 2
Data Block Length
WRITE_BLK_LEN
0
1
......
11
12–15
The block length might therefore be in the range 1, 2, 4...2048 bytes. This parameter defines the block
length if WRITE_BLK_PARTIAL is not set. If WRITE_BLK_PARTIAL is set this parameter contains the
maximum allowed value of the block length in bytes. All block lengths between one and this value are
permitted. The actual block size is programmed by the command SET_BLOCKLEN (CMD16). These
WP_GRP_ENABLE
DEFAULT_ECC
R2W_FACTOR
WRITE_BLK_LEN
Block length
2
2
......
2
reserved
0
1
11
= 1 byte
= 2 bytes
= 2048 bytes
Multiples of read access time
1
2 (write half as fast as read)
4
8
16
32
reserved
WRITE_BLK_LEN
.
Remark
HB28E016/D032/D064/B128MM2
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