AT45DB321D_12 datasheet(22/51 Pages) AD

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AT45DB321D [DATASHEET]

3597R–DFLASH–11/2012

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.

12.1

Manufacturer and Device ID Information

12.1.1 Byte 1 – Manufacturer ID

12.1.2 Byte 2 – Device ID (Part 1)

12.1.3 Byte 3 – Device ID (Part 2)

12.1.4 Byte 4 – Extended Device Information String Length

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 Adesto

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

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 = Adesto

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

Density code

00111 = 32Mb

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

00001 = Second version

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 1

Device ID

Byte 2

Device ID

Byte 3

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

27H

00H

01H

Data

Opcode

Each transition

represents 8 bits

AT45DB321D Datasheet(PDF) 22 Page - Analog Devices

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