8

AT45CS1282 [Preliminary]

3447A–DFLSH–2/04

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. This mode is only offered via the serial interface with clock frequencies up to 25 MHz. 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 Informa-

tion will be output.

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.

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

0111

11

Manufacturer ID

1FH = Atmel

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

29H

0

0

1010

01

Density Code

01001 = 128-Mbit

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

001 = 2-Bit/Cell Technology

20H

0

0

1000

00

Product Version

00000 = Initial Version

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

0000

00

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

29H

20H

00H

Data

Data

SI

SO

Opcode

Each transition

represents 8 bits