AT45DB021D_09 datasheet(26/54 Pages) ATMEL

26 / 54 page

3638I–DFLASH–04/09

AT45DB021D

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

23H

Density Code

00011 = 2-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

00000 = Initial 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

9FH

Manufacturer ID

Byte n

Device ID

Byte 1

Device ID

Byte 2

This information would only be output

if the Extended Device Information String Length

value was something other than 00H.

Extended

Device

Information

String Length

Extended

Device

Information

Byte x

Extended

Device

Information

Byte x + 1

1FH

23H

00H

Data

Opcode

Each transition

represents 8 bits

AT45DB021D Datasheet(PDF) 26 Page - ATMEL Corporation

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