12

AT25SF321B

DS-AT25SF321B–179E–06-2020

1.

OP = Opcode (command number), AD = Address. DA = Data. 0 indicates the corresponding transfer does not occur in that command. 1 indicates the

transfer does occur. For example, 1-0-0 indicates a command transfer occurs, but no address or data transfers occur.

Op: Opcode or Commands (8-bits): 0 => No Opcode [continuous Read], 1 => 8 clocks for Opcode, 2 => 4 clocks for Opcode, 4 => 2 clocks for opcode.

AD: Address (24-bits) Only: 0 => No address, Opcode only operation, 1 => 24 clocks for Address, 2 => 12 clocks for address, 4 => 6 clocks for address.

AD: Address (24-bits) + Mode (8-bits): 2 => 12 clocks for address, 4 clocks for mode [BBh only], 4 => 6 clocks for address, 2 clocks for mode [EBh and E7h].

DA: Data(8-bits): 1 => 8 clocks for byte, 2 => 4 clocks for byte, 4 => 2 clocks for byte.

Page Program

02h

1-1-1

N

0

0

1+

Quad Page Program

32h

1-1-4

N

0

0

1+

Erase Commands

Block Erase (4 kbytes)

20h

1-1-0

N

0

0

0

Block Erase (32 kbytes)

52h

1-1-0

N

0

0

0

Block Erase (64 kbytes)

D8h

1-1-0

N

0

0

0

Chip Erase

C7h/60h

1-0-0

N

0

0

0

Suspend/Resume Commands

Program/Erase Suspend

75h

1-0-0

N

0

0

0

Program/Erase Resume

7Ah

1-0-0

N

0

0

0

Status Register Commands

Read Status Register 1

05h

1-0-1

N

0

0

1

Read Status Register 2

35h

1-0-1

N

0

0

1

Read Status Register 3

15h

1-0-1

N

0

0

1

Write Status Register 1

01h

1-0-1

N

0

0

1

Write Status Register 2

31h

1-0-1

N

0

0

1

Write Status Register 3

11h

1-0-1

N

0

0

1

Device Information Commands

Manufacturer/Device ID

90h

1-1-1

N

0

0

2

Mfgr./Device ID Dual I/O

92h

1-2-2

N

0

4

2

Mfgr./Device ID Quad I/O

94h

1-4-4

N

0

4

2

Read JEDEC ID

9Fh

1-0-1

N

0

0

3

Read Serial Flash Discoverable

Parameter

5Ah

1-1-1

N

0

8

1+

OTP Commands

Erase Security Registers

44h

1-1-0

N

0

0

0

Program Security Registers

42h

1-1-1

N

0

0

1+

Read Security Registers

48h

1-1-1

N

0

8

1+

Read Unique ID Number

4Bh

1-0-1

N

0

32

1+

Table 6-1.

AT25SF321B Command Table (continued)

Command Name

Command

Opcode

Bus Transfer Type

Mode Bit

Present

Mode Bit

Clocks

Wait Cycle

Dummy Clocks

# of Data

Bytes