13

3387L–DFLASH–6/06

AT45DB321C

7.

Manufacturer and Device ID Read

This instruction conforms to the JEDEC standard and allows the user to read the Manufacturer ID, Device ID, and

Extended Device Information. A 1-byte opcode, 9FH, must be clocked into the device while the CS pin is low. After the

opcode is clocked in, the Manufacturer ID, 2 bytes of Device ID and Extended Device Information will be clocked out on the

SO pin. The fourth byte of the sequence output is the Extended Device Information String Length byte. This byte is used to

signify how many bytes of Extended Device Information will be output.

7.1

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.

7.1.1

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

7.1.2

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

0

0

1

0

0

1

1

1

Density Code

00111 = 32-Mbit

7.1.3

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

7.1.4

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

27H

00H

00H

Data

Data

SI

SO

Opcode

Each transition represents

8 bits and 8 clock cycles