HB28D032MM2 datasheet(20/90 Pages) RENESAS

20 / 90 page

HB28H016/D032/B064/B128MM2

Rev.5.0, Jan. 2003, page 18 of 88

• 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

C_SIZE_MULT+2.

Multiply Factor for the Device Size

C_SIZE_MULT

MULT

Remark

2 = 4

3 = 8

4 = 16

5 = 32

6 = 64

7 = 128

8 = 256

9 = 512

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:

size of erasable unit = (ERASE_GRP_SIZE + 1) * (ERASE_GRP_MULT + 1)

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.

HB28D032MM2 Datasheet(PDF) 20 Page - Renesas Technology Corp