26

3542F–DFLASH–09/06

AT45DB642D

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

28H

0

0

1

0

1

0

0

0

Density Code

01000 = 64-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

SLC 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

28H

00H

00H

Data

Data

SI

SO

Opcode

Each transition

represents 8 bits