Operation mode summary, Group a commands consist of, Group b commands consist of – Rainbow Electronics AT45DQ321 User Manual
Page 46: Group c commands consist of, Group d commands consist of
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AT45DQ321 [ADVANCE DATASHEET]
DS-45DQ321-031–DFLASH–12/2012
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.
Read Configuration Register
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) Read
2.
Buffer 1 (or 2) Write
3.
Status Register Read
4.
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
to determine which of the Group B, Group C, and Group D commands are allowed.