AT45DB021D ATMEL [ATMEL Corporation], AT45DB021D Datasheet - Page 27

• Manufacturer Part Number: AT45DB021D
• Description: 2-megabit 2.7-volt DataFlash
• Manufacturer: ATMEL [ATMEL Corporation]

14.2
3638B–DFLASH–02/07
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:
Group B commands consist of:
Group C commands consist of:
Group D commands consist of:
If a Group A command is in progress (not fully completed), then another command in Group A,
B, C, or D should not be started. However, during the internally self-timed portion of Group B
commands 1 through 4, any command in Group C can be executed. During the internally self-
timed portion of Group B commands 5 through 10, only Group C commands 3 and 4 can be exe-
cuted. Finally, during the internally self-timed portion of a Group D command, only the Status
Register Read command should be executed.
1. Main Memory Page Read
2. Continuous Array Read
3. Read Sector Protection Register
4. Read Sector Lockdown Register
5. Read Security Register
1. Page Erase
2. Block Erase
3. Sector Erase
4. Chip Erase
5. Main Memory Page to Buffer Transfer
6. Main Memory Page to Buffer Compare
7. Buffer to Main Memory Page Program with Built-in Erase
8. Buffer to Main Memory Page Program without Built-in Erase
9. Main Memory Page Program through Buffer
10. Auto Page Rewrite
1. Buffer Read
2. Buffer Write
3. Status Register Read
4. Manufacturer and Device ID Read
1. Erase Sector Protection Register
2. Program Sector Protection Register
3. Sector Lockdown
4. Program Security Register
AT45DB021D [Preliminary]
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