26

3639E–DFLASH–5/08

AT45DB011D

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

Note:

Based on JEDEC publication 106 (JEP106), Manufacturer ID data can be comprised of any number of bytes. Some manufacturers may have

Manufacturer ID codes that are two, three or even four bytes long with the first byte(s) in the sequence being 7FH. A system should detect code

7FH as a “Continuation Code” and continue to read Manufacturer ID bytes. The first non-7FH byte would signify the last byte of Manufacturer ID

data. For Atmel (and some other manufacturers), the Manufacturer ID data is comprised of only one byte.

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

0

0

0

1

1

1

1

1

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

24H

0

0

1

0

0

0

1

0

Density Code

00010 = 1-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

0

0

0

0

0

0

0

0

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

0

0

0

0

0

0

0

0

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

CS

1FH

22H

00H

00H

Data

Data

SI

SO

Opcode

Each transition

represents 8 bits