AT25SF321B datasheet(14/63 Pages) RENESAS

14 / 63 page

DS-AT25SF321B-179 Rev. F

Page 14

2022-06-03

AT25SF321B Datasheet

Commands and Addressing

A valid command or operation must be started by asserting the CS pin. After that, the host controller must clock

out a valid 8-bit opcode on the SPI bus. Following the opcode, command-dependent information, such as address

and data bytes, can be clocked out by the host controller. All opcode, address, and data bytes are transferred with

the most-significant bit (MSB) first. An operation is ended by deasserting the CS pin.

Opcodes not supported by the AT25SF321B are ignored, and no operation is started. The device continues to

ignore any data presented on the SI pin until the start of the next operation (CS pin deasserted, then reasserted).

If the CS pin is deasserted before complete opcode and address information is sent to the device, the device

simply returns to the idle state and waits for the next operation.

Device addressing requires three bytes, representing address bits A23-A0, to be sent. Since the upper address

limit of the AT25SF321B memory array is 3FFFFFh, address bits A23-A22 are always ignored by the device.

Table 4. AT25SF321B Command Table

Command Name

Command

Opcode

Bus Transfer Type

(OP-AD-DA)(1)

Mode Bit

Present

Mode Bit

Clocks

Wait Cycle

Dummy Clocks

# of Data

Bytes

System Commands

Enable Reset

66h

1-0-0

Reset Device

99h

1-0-0

Deep Power-down

B9h

1-0-0

Release Power-down

ABh

1-0-0

Read Commands

Normal Read Data

03h

1-1-1

Fast Read

0Bh

1-1-1

Dual Output Fast read

3Bh

1-1-2

Dual I/O Fast read

BBh

1-2-2

Dual I/O Fast read (Continuous Mode)

BBh

0-2-2

Quad Output Fast read

6Bh

1-1-4

Quad I/O Fast read

EBh

1-4-4

Quad I/O Fast read (Continuous

Mode)

EBh

0-4-4

Word Read Quad I/O

E7h

1-4-4

Word Read Quad I/O (Continuous

Mode)

E7h

0-4-4

Set Burst With Wrap

77h

1-0-4

1, D[6:4]

Write Commands

Write Enable

06h

1-0-0

Volatile SR Write Enable

50h

1-0-0

Write Disable

04h

1-0-0

Program Commands

Page Program

02h

1-1-1

Quad Page Program

32h

1-1-4

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