M29F400BT datasheet(20/40 Pages) STMICROELECTRONICS

20 / 40 page

Command interface

M29F400BT, M29F400BB

20/40

The Command Interface only uses A–1, A0-A10 and DQ0-DQ7 to verify the commands;

A11-A17, DQ8-DQ14 and DQ15 are Don’t Care. DQ15A–1 is A–1 when BYTE is VIL or

DQ15 when BYTE is VIH.

4.11

Read/Reset

After a Read/Reset command, read the memory as normal until another command is

issued.

4.12

Auto Select

After an Auto Select command, read Manufacturer ID, Device ID or Block Protection Status.

4.13

Program, Unlock Bypass Program, Chip Erase, Block Erase

After these commands read the Status Register until the Program/Erase Controller

completes and the memory returns to Read Mode. Add additional Blocks during Block

Erase Command with additional Bus Write Operations until Timeout Bit is set.

Table 5.

Commands, 8-bit mode, BYTE = VIL

(1) (2)

X = Don’t Care, PA = Program Address, PD = Program Data, BA = Any address in the Block.

All values are in hexadecimal.

Command

Bus Write Operations

1st

2nd

3rd

4th

5th

6th

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

Read/Reset

AAA

555

Auto Select

AAA

555

AAA

Program

AAA

555

AAA

Unlock Bypass

AAA

555

AAA

Unlock Bypass

Program

Unlock Bypass

Reset

Chip Erase

AAA

555

AAA

555

AAA

Block Erase

6+ AAA

555

AAA

555

Erase Suspend

Erase Resume

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