AT45DQ321 datasheet(50/80 Pages) RENESAS

50 / 80 page

DS-AT45DQ321-031 Rev. H

Page 50

7/22/24

AT45DQ321 Datasheet

15. 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

Read Configuration Register

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

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 do not start another command in Group A, B, C,

or D; 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 must use Group C commands using Buffer 2, and vice versa.

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

command.

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 5 to determine which of the Group B, Group C, and Group D commands are allowed.

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