AT25SF321 datasheet(31/48 Pages) DIALOG

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AT25SF321

DS-25SF321–047F–8/2017

Figure 10-4. Write Enable for Volatile Status Register

11.

Other Commands and Functions

The AT25SF321 supports three different commands to access device identification that indicates the manufacturer,

device type, and memory density. The returned data bytes provide information as shown in Table 11-1.

11.1 Read Manufacturer and Device ID (9Fh)

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

while it is in system.

Since not all Flash devices are capable of operating at very high clock frequencies, applications should be designed to

read the identification information from the devices at a reasonably low clock frequency to ensure all devices used in the

application can be identified properly. Once the identification process is complete, the application can increase the clock

frequency to accommodate specific Flash devices that are capable of operating at the higher clock frequencies.

To read the identification information, the CS pin must first be asserted and the opcode of 9Fh must be clocked into the

device. After the opcode has been clocked in, 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 followed by two bytes of Device

ID information. 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.

Table 11-2. Manufacturer and Device ID Information

MSB

OPCODE

GH-

MPEDANCE

Table 11-1. Manufacturer and Device ID Information

Instruction

Opcode

Dummy

Bytes

Manufacturer ID

(Byte #1)

Device ID

(Byte #2)

Device ID

(Byte #3)

Read Manufacturer and Device ID

9Fh

1Fh

87h

01h

Read ID (Legacy Command)

90h

1Fh

15h

Resume from Deep Power-Down and

Read Device ID

ABh

15h

Byte No.

Data Type

Value

Manufacturer ID

1Fh

Device ID (Part 1)

87h

Device ID (Part 2)

01h

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