AT25SF081B datasheet(13/61 Pages) DIALOG

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Datasheet

5-Aug-2021

DS-AT25SF081B-189

Revision E

8-Mbit SPI Serial Flash Memory

with Dual-I/O and Quad-I/O Support

AT25SF081B

Datasheet

Commands and Addressing

A valid instruction 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, instruction-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 AT25SF081B 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

AT25SF081B memory array is 0FFFFFh, address bits A23-A20 are always ignored by the device.

Table 4: AT25SF081B Command Table

Command Name

Command

Opcode

Bus Transfer Type

(OP-AD-DA)(1)

Mode Bit

Present

Mode Bit

Clocks

Wait Cycle Dum-

my 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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