AT45DB011D-MH-SL954 ATMEL [ATMEL Corporation], AT45DB011D-MH-SL954 Datasheet - Page 26

• Manufacturer Part Number: AT45DB011D-MH-SL954
• Description: 1-megabit 2.7-volt Minimum DataFlash
• Manufacturer: ATMEL [ATMEL Corporation]

14.1
14.1.1
14.1.2
14.1.3
14.1.4
Note:
26
Value
Value
Value
Value
Hex
1FH
Hex
24H
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
AT45DB011D
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
Family Code
SI
MLC Code
Bit 6
Bit 6
Bit 6
Bit 6
0
0
0
0
Each transition
represents 8 bits
Bit 5
Bit 5
Bit 5
Bit 5
0
1
0
0
To read the identification information, the CS pin must first be asserted and the opcode of 9FH
must be clocked into the device. After the opcode has been clocked in, the device will begin out-
putting the identification data on the SO pin during the subsequent clock cycles. The first byte
that will be output will be the Manufacturer ID followed by two bytes of Device ID information.
The fourth byte output will be the Extended Device Information String Length, which will be 00H
indicating that no Extended 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.
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
1
0
0
0
1FH
Density Code
Bit 2
Bit 2
Bit 2
Bit 2
1
0
0
0
Device ID
Byte 1
22H
Bit 1
Bit 1
Bit 1
Bit 1
1
1
0
0
Bit 0
Bit 0
Bit 0
Bit 0
Device ID
1
0
0
0
Byte 2
00H
String Length
Information
Extended
Device
00H
Manufacturer ID
Family Code
Density Code
MLC Code
Product Version
Byte Count
if the Extended Device Information String Length
This information would only be output
value was something other than 00H.
Information
Extended
Device
Byte x
Data
Information
Byte x + 1
Extended
Device
Data
1FH = Atmel
00010 = 1-Mbit
00000 = Initial Version
00H = 0 Bytes of Information
001 = DataFlash
000 = 1-bit/Cell Technology
3639E–DFLASH–5/08