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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
7.1.1
Hex
Manufacturer and Device ID Information
Byte 1 – Manufacturer ID
JEDEC Assigned Code
Value
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
Family Code
Density Code
Value
27H
Bit 7
0
Bit 6
0
Bit 5
1
Bit 4
0
Bit 3
0
Bit 2
1
Bit 1
1
Bit 0
1
Family Code
Density Code
001 = DataFlash
00111 = 32-Mbit
7.1.3
Byte 3 – Device ID (Part 2)
Hex
MLC Code
Product Version Code
Value
00H
Bit 7
0
Bit 6
0
Bit 5
0
Bit 4
0
Bit 3
0
Bit 2
0
Bit 1
0
Bit 0
0
MLC Code
Product Version
000 = 1-bit/Cell Technology
00000 = Initial Version
7.1.4
Hex
Byte 4 – Extended Device Information String Length
Byte Count
Value
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
CS
SI
9FH
Opcode
SO
1FH
Manufacturer ID
Byte n
27H
Device ID
Byte 1
00H
Device ID
Byte 2
00H
Extended
Device
Data
Extended
Device
Data
Extended
Device
Information
String Length
Information
Byte x
Information
Byte x + 1
This information
would only be output
if the Extended Device
Each transition represents
8 bits and 8 clock cycles
Information String Length
value was something
other than 00H.
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.
13
3387M–DFLASH–2/08
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