AT26DF041-MU ATMEL [ATMEL Corporation], AT26DF041-MU Datasheet - Page 8

• Manufacturer Part Number: AT26DF041-MU
• Description: 4-MEGABIT 3.0-VOLT ONLY OR 2.7-VOLT ONLY SERIAL FIRMWARE DATAFLASH-R
• Manufacturer: ATMEL [ATMEL Corporation]

6. Manufacturer and Device ID Read
This instruction 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 Informa-
tion will be output. Reading the Extended Device Information String Length (byte 4) and any subsequent information is
optional.
6.1
6.1.1
6.1.2
6.1.3
6.1.4
Note:
8
CS
SO
Each transition represents
Value
Value
Value
Value
SI
Hex
Hex
Hex
Hex
1FH
44H
00H
00H
8 bits and 8 clock cycles
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
AT26DF041
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
Family Code
MLC Code
Bit 6
Bit 6
Bit 6
Bit 6
Opcode
0
1
0
0
9FH
Bit 5
Bit 5
Bit 5
Bit 5
0
0
0
0
Manufacturer ID
JEDEC Assigned Code
Byte n
1FH
Bit 4
Bit 4
Bit 4
Bit 4
Byte Count
1
0
0
0
Product Version Code
Bit 3
Bit 3
Bit 3
Bit 3
1
0
0
0
Device ID
Density Code
Byte 1
44H
Bit 2
Bit 2
Bit 2
Bit 2
1
1
0
0
Bit 1
Bit 1
Bit 1
Bit 1
Device ID
1
0
0
0
Byte 2
00H
Bit 0
Bit 0
Bit 0
Bit 0
1
0
0
0
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
Data
1FH = Atmel
00100 = 4-Mbit
00000 = Initial version
00H = 0 Bytes of Information
010 = AT26xxx Series
000 = 1-bit/cell Technology
3495B–DFLSH–8/05