AT25SL321 datasheet(15/82 Pages) DIALOG

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AT25SL321

DS-25SL321–112H–2020-10

Instructions

The SPI instruction set of the AT25SL321 consists of thirty eight basic instructions and the QPI instruction set

of the AT25SL321 consists of thirty- one basic instructions that are fully controlled through the SPI bus (see

Instruction Set Table 8-1 and Table 8-2). Instructions are initiated with the falling edge of Chip Select (CS). The

first byte of data clocked into the input pins (SI or IO [3:0]) provides the instruction code. Data on the SI input

is sampled on the rising edge of clock with most significant bit (MSB) first.

Instructions are completed with the rising edge of edge CS. Clock relative timing diagrams for each instruction

are included in Figure 8-1 through Figure 8-63. All read instructions can be completed after any clocked bit.

However, all instructions that Write, Program or Erase must complete on a byte (CS driven high after a full 8-bit

have been clocked) otherwise the instruction needs to be terminated. This feature further protects the device from

inadvertent writes. Additionally, while the memory is being programmed or erased, or when the Status Register is

being written, all instructions except for Read Register are ignored until the program or erase cycle has completed.

8.1

Instruction Set Tables

Table 8-1.

Manufacturer and Device Identification

ID code

Instruction

Manufacturer ID

Adesto

1Fh

90h, 92h, 94h, 9Fh

Device ID

AT25SL321

15h

90h, 92h, 94h, ABh

Memory Type ID

SPI / QPI

42h

9Fh

Capacity Type ID

32M

16h

9Fh

Table 8-2.

Instruction Set Table 1 (SPI instruction)(1)

Instruction Name

Byte 0

Byte 1

Byte 2

Byte 3

Byte 4

Byte 5

(Clock Number)

(0 – 7)

(8 - 15)

(16 - 23)

(24 - 31)

(32 - 39)

(40 - 47)

Write Enable

06h

Write Enable For

Volatile Status Register

50h

Write Disable

04h

Read Status Register-1

05h

(SR7-SR0)(2)

Read Status Register-2

35h

(SR15-SR8)(2)

Write Status Register-1

01h

(SR7-SR0)

(SR15-SR8)

Write Status Register-2

31h

(SR15-SR8)

Read Data

03h

A23-A16

A15-A8

A7-A0

(D7-D0)

Fast Read Data

0Bh

A23-A16

A15-A8

A7-A0

dummy

(D7-D0)

Page Program

02h

A23-A16

A15-A8

A7-A0

(D7-D0)(3)

Enable QPI

38h

Block Erase (4 kB)

20h

A23-A16

A15-A8

A7-A0

Block Erase (32 kB)

52h

A23-A16

A15-A8

A7-A0

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