M29DW323DB70N6 データシートの表示（PDF） - STMicroelectronics

部品番号

コンポーネント説明

メーカー

M29DW323DB70N6

32 Mbit (4Mb x8 or 2Mb x16,Dual Bank 8:24, Boot Block) 3V Supply Flash Memory

STMicroelectronics 

M29DW323DT, M29DW323DB

Enter Extended Block Command

The M29DW323D has an extra 64KByte block

(Extended Block) that can only be accessed using

the Enter Extended Block command. Three Bus

write cycles are required to issue the Extended

Block command. Once the command has been is-

sued the device enters Extended Block mode

where all Bus Read or Program operations to the

Boot Block addresses access the Extended Block.

The Extended Block (with the same address as

the boot block) cannot be erased, and can be

treated as one-time programmable (OTP) memo-

ry. In Extended Block mode the Boot Blocks are

not accessible. In Extended Block mode dual op-

erations are possible, with the Extended Block

mapped in Bank A. When in Extended Block

mode, Erase Commands in Bank A are not al-

lowed.

To exit from the Extended Block mode the Exit Ex-

tended Block command must be issued.

The Extended Block can be protected, however

once protected the protection cannot be undone.

Exit Extended Block Command

The Exit Extended Block command is used to exit

from the Extended Block mode and return the de-

vice to Read mode. Four Bus Write operations are

required to issue the command.

Block Protect and Chip Unprotect Commands

Groups of blocks can be protected against acci-

dental Program or Erase. The Protection Groups

are shown in APPENDIX A., Tables 23 and 24,

Block Addresses. The whole chip can be unpro-

tected to allow the data inside the blocks to be

changed.

Block Protect and Chip Unprotect operations are

described in APPENDIX D.

Table 5. Commands, 16-bit mode, BYTE = VIH

Bus Write Operations

Command

1st

2nd

3rd

4th

5th

6th

Addr Data Addr Data Addr Data Addr Data Addr Data Addr Data

Read/Reset

1 X F0

3 555 AA 2AA 55 X F0

Auto Select

3 555

AA

2AA

55

(BKA)

555

90

Program

4 555 AA 2AA 55 555 A0 PA PD

Double Word Program 3 555 50 PA0 PD0 PA1 PD1

Unlock Bypass

3 555 AA 2AA 55 555 20

Unlock Bypass

Program

2 X A0 PA PD

Unlock Bypass Reset 2 X 90 X 00

Chip Erase

6 555 AA 2AA 55 555 80 555 AA 2AA 55 555 10

Block Erase

6+ 555 AA 2AA 55 555 80 555 AA 2AA 55 BA 30

Erase Suspend

1 BKA B0

Erase Resume

1 BKA 30

Read CFI Query

1 55 98

Enter Extended Block 3 555 AA 2AA 55 555 88

Exit Extended Block

4 555 AA 2AA 55 555 90 X 00

Note: X Don’t Care, PA Program Address, PD Program Data, BA Any address in the Block, BKA Bank Address. All values in the table are in

hexadecimal.

The Command Interface only uses A–1, A0-A10 and DQ0-DQ7 to verify the commands; A11-A20, DQ8-DQ14 and DQ15 are Don’t

Care. DQ15A–1 is A–1 when BYTE is VIL or DQ15 when BYTE is VIH.

17/51

Share Link: