HB28K032MM3 datasheet(39/91 Pages) RENESAS

39 / 91 page

HB28K032/L064/J128/J256/J512MM3, HB28K032/L064/J128/J256RM3

Rev.0.02, Sep.15.2004, page 39 of 89

• Write protect management

Card data may be protected against either erase or write. The entire card may be permanently write

protected by the manufacturer or content provider by setting the permanent or temporary write protect bits

in the CSD. Portions of the data may be protected (in units of WP_GRP_SIZE sectors as specified in the

CSD), and the write protection may be changed by the application. The SET_WRITE_PROT command

sets the write protection of the addressed write-protect group, and the CLR_WRITE_PROT command

clears the write protection of the addressed write-protect group. The SEND_WRITE_PROT command is

similar to a single block read command. The card shall send a data block containing 32 write protection

bits (representing 32 write protect groups starting at the specified address) followed by 16 CRC bits. The

address field in the write protect commands is a group address in byte units. The card will ignore all LSB’s

below the group size.

• Card lock/unlock operation

The password protection feature enables the host to lock a card while providing a password, which later

will be used for unlocking the card. The password and its size are kept in a 128-bit PWD and 8-bit

PWD_LEN registers, respectively. These registers are non-volatile so that a power cycle will not erase

them. Locked cards respond to (and execute) all commands in the "basic" command class (class 0) and

“lock card” command class. Thus the host is allowed to reset, initialize, select, query for status, etc., but

not to access data on the card. If the password was previously set (the value of PWD_LEN is not‘0’) will

be locked automatically after power on. Similar to the existing CSD and CID register write commands the

lock/unlock command is available in "transfer state" only. This means that it does not include an address

argument and the card has to be selected before using it. The card lock/unlock command has the structure

and bus transaction type of a regular single block write command. The transferred data block includes all

the required information of the command (password setting mode, PWD itself, card lock/unlock etc.). The

following table describes the structure of the command data block.

Lock Card Data Structure

Byte#

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

Reserved

ERASE

LOCK_

UNLOCK

CLR_

PWD

SET_

PWD

PWD_LEN

Password data

...

PWD_LEN + 1

HB28K032MM3 Datasheet(PDF) 39 Page - Renesas Technology Corp

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