AT25SF321 datasheet(32/48 Pages) DIALOG

32 / 48 page

AT25SF321

DS-25SF321–047F–8/2017

Figure 11-1. Read Manufacturer and Device ID

11.2 Read ID (Legacy Command) (90h)

Identification information can be read from the device to enable systems to electronically query and identify the device

while it is in system. The preferred method for doing so is the JEDEC standard “Read Manufacturer and Device ID (9Fh)”

method described in Section 11.1 on page 30; however, the legacy Read ID command is supported on the AT25SF321

to enable backwards compatibility to previous generation devices.

To read the identification information, the CS pin must first be asserted and the opcode of 90h must be clocked into the

device, followed by three dummy bytes. After the opcode has been clocked in followed by three dummy bytes, the device

will begin outputting the identification data on the SO pin during the subsequent clock cycles. The first byte that will be

output will be the Manufacturer ID of 1Fh followed by a single byte of data representing a device code of 15h. After the

device code is output, the sequence of bytes will repeat.

Deasserting the CS pin will terminate the Read ID 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 read.

Table 11-3. 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 Adesto)

Device ID (Part 1)

Family Code

Density Code

87h

Family Code:100 (AT25SFxxx series)

Density Code: 00111 (32-Mbit)

Device ID (Part 2)

Sub Code

Product Version Code

01h

Sub Code: 000 (Standard series)

Product Version: 00001

SCK

9Fh

OPCODE

1Fh

87h

01h

MANUFACTURER ID

DEVICE ID

BYTE1

DEVICE ID

BYTE2

HIGH-IMPEDANCE

Note: Each transition

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

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