24

3669A–DFLASH–07/07

AT25DF321

Deasserting the CS pin will terminate the Manufacturer and Device ID read operation and put

the SO pin into a high-impedance state. The CS pin can be deasserted at any time and does not

require that a full byte of data be read.

Figure 11-1. Read Manufacturer and Device ID

Table 11-1.

Manufacturer and Device ID Information

Byte No.

Data Type

Value

1

Manufacturer ID

1Fh

2

Device ID (Part 1)

47h

3

Device ID (Part 2)

00h

4

Extended Device Information String Length

00h

Table 11-2.

Manufacturer and Device ID Details

Data Type

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Hex

Value

Details

Manufacturer ID

JEDEC Assigned Code

1Fh

JEDEC Code:

0001 1111 (1Fh for Atmel)

00

011

111

Device ID (Part 1)

Family Code

Density Code

47h

Family Code:

Density Code:

010 (AT25/26DFxxx series)

00111 (32-Mbit)

01

000

111

Device ID (Part 2)

Sub Code

Product Version Code

00h

Sub Code:

Product Version:

000 (Standard series)

00000 (Initial version)

00

000

000

SCK

CS

SI

SO

6

0

9Fh

8

7

38

OPCODE

1Fh

47h

00h

00h

MANUFACTURER ID

DEVICE ID

BYTE 1

DEVICE ID

BYTE 2

EXTENDED

DEVICE

INFORMATION

STRING LENGTH

HIGH-IMPEDANCE

14

16

15

22

24

23

30

32

31

Note: Each transition

shown for SI and SO represents one byte (8 bits)