HB28B064MM2 RENESAS [Renesas Technology Corp], HB28B064MM2 Datasheet - Page 21
HB28B064MM2
Manufacturer Part Number
HB28B064MM2
Description
MultiMediaCard 16 MByte/32 MByte/64 MByte/128 MByte
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HB28B064MM2.pdf
(90 pages)
- Current page: 21 of 90
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• DEFAULT_ECC
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.
• R2W_FACTOR
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.
• WRITE_BLK_LEN
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
Hitachi MultiMediaCards support blocks with the length 512 bytes. The parameter WRITE_BLK_LEN is
permanently assigned to the value 0x9 (512 bytes).
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
HB28H016/D032/B064/B128MM2
Rev.5.0, Jan. 2003, page 19 of 88
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