AT45DB321E-SHF-B View Datasheet(PDF) - Unspecified

Part Name

Description

MFG CO.

AT45DB321E-SHF-B

32-Mbit DataFlash (with Extra 1-Mbits), 2.3V Minimum SPI Serial Flash Memory

Unspecified 

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14. 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 (SPI)

3. Read Sector Protection Register

4. Read Sector Lockdown Register

5. Read Security Register

6. Buffer 1 (or 2) Read

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) with Built-In Erase

10. Main Memory Byte/Page Program through Buffer 1 without Built-In Erase

11. Auto Page Rewrite

Group C commands consist of:

1. Buffer 1 (or 2) Write

2. Status Register Read

3. Manufacturer and Device ID Read

Group D commands consist of:

1. Erase Sector Protection Register

2. Program Sector Protection Register

3. Sector Lockdown

4. Program Security Register

5. Buffer and Page Size Configuration

6. Freeze Sector Lockdown

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, any command in Group C can be

executed. The Group B commands using Buffer 1 should use Group C commands using Buffer 2 and vice versa. Finally,

during the internally self-timed portion of a Group D command, only the Status Register Read command should be

executed.

Most of the commands in Group B can be suspended and resumed, except the Buffer Transfer, Buffer Compare, and

Auto Page Rewrite operations. If a Group B command is suspended, all of the Group A commands can be executed. See

Table 6-4 to determine which of the Group B, Group C, and Group D commands are allowed.

AT45DB321E 39

8784E–DFLASH–10/2013

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