AT45DB321D datasheet(26/57 Pages) ATMEL

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3597N–DFLASH–04/09

AT45DB321D

14. Manufacturer and Device ID Read

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

and identify the device while it is in system. The identification method and the command opcode

comply with the JEDEC standard for “Manufacturer and Device ID Read Methodology for SPI

Compatible Serial Interface Memory Devices”. The type of information that can be read from the

device includes the JEDEC defined Manufacturer ID, the vendor specific Device ID, and the ven-

dor specific Extended Device Information.

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 out-

putting 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.

The fourth byte output will be the Extended Device Information String Length, which will be 00H

indicating that no Extended Device Information follows. As indicated in the JEDEC standard,

reading the Extended Device Information String Length and any subsequent data is optional.

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.

14.1 Manufacturer and Device ID Information

14.1.1

Byte 1 – Manufacturer ID

Hex

Value

JEDEC Assigned Code

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

1FH

Manufacturer ID

1FH = Atmel

14.1.2

Byte 2 – Device ID (Part 1)

Hex

Value

Family Code

Density Code

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Family Code

001 = DataFlash

27H

Density Code

00111 = 32-Mbit

14.1.3

Byte 3 – Device ID (Part 2)

Hex

Value

MLC Code

Product Version Code

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

MLC Code

000 = 1-bit/Cell Technology

00H

Product Version

00001 = Second Version

14.1.4

Byte 4 – Extended Device Information String Length

Hex

Value

Byte Count

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

00H

Byte Count

00H = 0 Bytes of Information

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