AT45DB321D-SU-2.5 Atmel, AT45DB321D-SU-2.5 Datasheet - Page 22

• Manufacturer Part Number: AT45DB321D-SU-2.5
• Description: memory size:32mbit; supply voltage range:2.5v to 3.6v; memory case style:soic; no. of...
• Manufacturer: Atmel

12.1
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
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.
Manufacturer and Device ID Information
Note:
Value
Value
Value
Value
CS
SO
Hex
1FH
Hex
27H
Hex
00H
Hex
00H
SI
Each transition
represents 8 bits
Bit 7
Bit 7
Bit 7
Bit 7
0
0
0
0
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.
Family Code
MLC Code
Opcode
Bit 6
Bit 6
Bit 6
Bit 6
9FH
0
0
0
0
Manufacturer ID
Bit 5
Bit 5
Bit 5
Bit 5
0
1
0
0
Byte 1
JEDEC Assigned Code
1FH
Bit 4
Bit 4
Bit 4
Bit 4
Byte Count
1
0
0
0
Device ID
Byte 2
27H
Product Version Code
Bit 3
Bit 3
Bit 3
Bit 3
1
0
0
0
Density Code
Bit 2
Bit 2
Bit 2
Bit 2
Device ID
1
1
0
Byte 3
0
00H
Bit 1
Bit 1
Bit 1
Bit 1
1
1
0
0
string length
information
Extended
device
01H
Bit 0
Bit 0
Bit 0
Bit 0
if the extended device information string length
1
1
1
0
This information would only be output
value was something other than 00H
information
Extended
device
Byte x
Data
Manufacturer ID
Family code
Density code
MLC code
Product version
Byte count
information
Byte x + 1
Extended
device
Data
Atmel AT45DB321D
1FH = Atmel
00111 = 32Mb
00001 = Second version
00H = 0 bytes of Information
001 = DataFlash
000 = 1-bit/cell technology
3597Q–DFLASH–6/11
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