AT45DB021B_05 Datasheet, PDF(9/32 Page) ATMEL Corporation

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AT45DB021B_05 Datasheet, PDF (9/32 Pages) ATMEL Corporation – 2-megabit 2.7-volt Only DataFlash

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AT45DB021B

5.4 Operation Mode Summary

The modes described can be separated into two groups â modes which make use of the Flash

memory array (Group A) and modes which do not make use of the Flash memory array (Group

B).

Group A modes consist of:

1. Main Memory Page Read

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

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

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

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

6. Page Erase

7. Block Erase

8. Main Memory Page Program through Buffer

9. Auto Page Rewrite

Group B modes consist of:

1. Buffer 1 (or 2) Read

2. Buffer 1 (or 2) Write

3. Status Register Read

If a Group A mode is in progress (not fully completed), then another mode in Group A should not

be started. However, during this time in which a Group A mode is in progress, modes in Group B

can be started.

This gives the Serial DataFlash the ability to virtually accommodate a continuous data stream.

While data is being programmed into main memory from buffer 1, data can be loaded into buffer

2 (or vice versa). See application note AN-4 (âUsing Atmelâs Serial DataFlashâ) for more details.

Table 5-3. Read Commands

Command

Continuous Array Read

Main Memory Page Read

Buffer 1 Read

Buffer 2 Read

Status Register Read

SCK Mode