at45db321c ATMEL Corporation, at45db321c Datasheet - Page 13

• Manufacturer Part Number: at45db321c
• Description: 32-megabit 2.7 Volt Dataflash At45db321c For New Designs Use At45db321d
• Manufacturer: ATMEL Corporation

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
7.1.2
7.1.3
7.1.4
Note:
3387M–DFLASH–2/08
Value
Value
Value
Value
Hex
1FH
Hex
27H
Hex
00H
Hex
00H
Manufacturer and Device ID Information
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.
Bit 7
Bit 7
Bit 7
Bit 7
Byte 1 – Manufacturer ID
Byte 2 – Device ID (Part 1)
Byte 3 – Device ID (Part 2)
Byte 4 – Extended Device Information String Length
0
0
0
0
CS
SO
Each transition represents
SI
8 bits and 8 clock cycles
Family Code
MLC Code
Bit 6
Bit 6
Bit 6
Bit 6
0
0
0
0
Bit 5
Bit 5
Bit 5
Bit 5
0
1
0
0
JEDEC Assigned Code
Opcode
9FH
Bit 4
Bit 4
Bit 4
Bit 4
Byte Count
1
0
0
0
Manufacturer ID
Product Version Code
Bit 3
Bit 3
Bit 3
Bit 3
Byte n
1FH
1
0
0
0
Density Code
Bit 2
Bit 2
Bit 2
Bit 2
1
1
0
0
Device ID
Byte 1
27H
Bit 1
Bit 1
Bit 1
Bit 1
1
1
0
0
Bit 0
Bit 0
Bit 0
Bit 0
Device ID
1
1
0
0
Byte 2
00H
String Length
Information
Extended
Device
00H
Manufacturer ID
Family Code
Density Code
MLC Code
Product Version
Byte Count
Information
Information String Length
Extended
Device
if the Extended Device
Byte x
would only be output
value was something
Data
This information
other than 00H.
Information
Byte x + 1
Extended
Device
1FH = Atmel
00111 = 32-Mbit
00000 = Initial Version
00H = 0 Bytes of Information
Data
001 = DataFlash
000 = 1-bit/Cell Technology
AT45DB321C
13