AT26DF041 データシートの表示（PDF） - Atmel Corporation
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AT26DF041 Datasheet PDF : 20 Pages
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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 Manufacturer and Device ID Information
6.1.1
Hex
Value
1FH
Byte 1 – Manufacturer ID
JEDEC Assigned Code
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2
0
0
0
1
1
1
Bit 1
1
Bit 0
1
6.1.2
Hex
Value
44H
Byte 2 – Device ID (Part 1)
Family Code
Density Code
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1
0
1
0
0
0
1
0
Bit 0
0
6.1.3
Hex
Value
00H
Byte 3 – Device ID (Part 2)
MLC Code
Product Version Code
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0
0
0
0
0
0
0
0
6.1.4
Hex
Value
00H
Byte 4 – Extended Device Information String Length
Byte Count
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0
0
0
0
0
0
0
0
Manufacturer ID
Family Code
Density Code
MLC Code
Product Version
Byte Count
1FH = Atmel
010 = AT26xxx Series
00100 = 4-Mbit
000 = 1-bit/cell Technology
00000 = Initial version
00H = 0 Bytes of Information
CS
SI
9FH
Opcode
SO
1FH
44H
00H
00H
Data
Data
Manufacturer ID Device ID
Byte n
Byte 1
Device ID
Byte 2
Extended
Device
Information
String Length
Extended
Device
Information
Byte x
Extended
Device
Information
Byte x + 1
Each transition represents
8 bits and 8 clock cycles
This information
would only be output
if the Extended Device
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.
8 AT26DF041
3495B–DFLSH–8/05
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