AT45DB021D_13 datasheet(22/48 Pages) ETC2

22 / 48 page

3638M–DFLASH–5/2013

AT45DB021D

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.

12.1 Manufacturer and Device ID Information

Table 12-1.

Byte 1 – Manufacturer ID

Table 12-2.

Byte 2 – Device ID (Part 1)

Table 12-3.

Byte 3 – Device ID (Part 2)

Table 12-4.

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 man-

ufacturers), 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

23H

Density Code

00011 = 2-Mbit

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

00000 = Initial 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 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

1FH

23H

00H

Data

Opcode

Each transition

represents 8 bits

AT45DB021D Datasheet(PDF) 22 Page - List of Unclassifed Manufacturers

AT45DB021D Datasheet(HTML) 22 Page - List of Unclassifed Manufacturers

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