AT45DB641E datasheet(39/72 Pages) ETC2

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AT45DB641E

DS-45DB641E-027E–DFLASH–1/2014

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:

Main Memory Page Read

Continuous Array Read (SPI)

Read Sector Protection Register

Read Sector Lockdown Register

Read Security Register

Buffer 1 (or 2) Read

Group B commands consist of:

Page Erase

Block Erase

Sector Erase

Chip Erase

Main Memory Page to Buffer 1 (or 2) Transfer

Main Memory Page to Buffer 1 (or 2) Compare

Buffer 1 (or 2) to Main Memory Page Program with Built-In Erase

Buffer 1 (or 2) to Main Memory Page Program without Built-In Erase

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

12. Read-Modify-Write

Group C commands consist of:

Buffer 1 (or 2) Write

Status Register Read

Manufacturer and Device ID Read

Group D commands consist of:

Erase Sector Protection Register

Program Sector Protection Register

Sector Lockdown

Program Security Register

Buffer and Page Size Configuration

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, Auto

Page Rewrite and Read-Modify-Write 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.

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