27

3597N–DFLASH–04/09

AT45DB321D

Note:

Based on JEDEC publication 106 (JEP106), Manufacturer ID data can be comprised of any number of bytes. Some manufacturers may have

Manufacturer ID codes that are two, three or even four bytes long with the first byte(s) in the sequence being 7FH. A system should detect code

7FH as a “Continuation Code” and continue to read Manufacturer ID bytes. The first non-7FH byte would signify the last byte of Manufacturer ID

data. For Atmel (and some other manufacturers), the Manufacturer ID data is comprised of only one byte.

14.2 Operation Mode Summary

The commands described previously can be grouped into four different categories to better

describe which commands can be executed at what times.

Group A commands consist of:

1. Main Memory Page Read

2. Continuous Array Read

3. Read Sector Protection Register

4. Read Sector Lockdown Register

5. Read Security Register

Group B commands consist of:

1. Page Erase

2. Block Erase

3. Sector Erase

4. Chip Erase

5. Main Memory Page to Buffer 1 (or 2) Transfer

6. Main Memory Page to Buffer 1 (or 2) Compare

7. Buffer 1 (or 2) to Main Memory Page Program with Built-in Erase

8. Buffer 1 (or 2) to Main Memory Page Program without Built-in Erase

9. Main Memory Page Program through Buffer 1 (or 2)

10. Auto Page Rewrite

Group C commands consist of:

1. Buffer 1 (or 2) Read

2. Buffer 1 (or 2) Write

3. Status Register Read

4. Manufacturer and Device ID Read

9FH

Manufacturer ID

Byte 1

Device ID

Byte 2

Device ID

Byte 3

This information would only be output

if the Extended Device Information String Length

value was something other than 00H.

Extended

Device

Information

String Length

Extended

Device

Information

Byte x

Extended

Device

Information

Byte x + 1

CS

1FH

27H

00H

01H

Data

Data

SI

SO

Opcode

Each transition

represents 8 bits