HB28E016MM2 View Datasheet(PDF) - Hitachi -> Renesas Electronics

Part Name

Description

Manufacturer

HB28E016MM2

MultiMediaCard™ 16 Mbyte/32 Mbyte/64 Mbyte/128 MByte

Hitachi -> Renesas Electronics 

HB28E016/D032/D064/B128MM2

• WP_GRP_ENABLE

The value is set to ‘1’, meaning group write protection is enabled.

• 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

Multiples of read access time

1

2 (write half as fast as read)

4

8

16

32

reserved

This parameter value is 2 for these Hitachi MultiMediaCards.

• WRITE_BLK_LEN

The data block length is computed as 2 . WRITE_BLK_LEN

Data Block Length

WRITE_BLK_LEN

0

1

......

11

12–15

Block length

20 = 1 byte

21 = 2 bytes

......

211 = 2048 bytes

reserved

Remark

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

19

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