at45db081d-su-sl955 ATMEL Corporation, at45db081d-su-sl955 Datasheet - Page 26

• Manufacturer Part Number: at45db081d-su-sl955
• Description: 8-megabit 2.5-volt Or 2.7-volt Dataflash
• Manufacturer: ATMEL Corporation

14. Manufacturer and Device ID Read
14.1
14.1.1
14.1.2
14.1.3
14.1.4
26
Value
Value
Value
Value
1FH
Hex
Hex
25H
Hex
00H
Hex
00H
Manufacturer and Device ID Information
AT45DB081D
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
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
Identification information can be read from the device to enable systems to electronically query
and identify the device while it is in system. The identification method and the command opcode
comply with the JEDEC standard for “Manufacturer and Device ID Read Methodology for SPI
Compatible Serial Interface Memory Devices”. The type of information that can be read from the
device includes the JEDEC defined Manufacturer ID, the vendor specific Device ID, and the ven-
dor specific Extended Device Information.
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
CS
SO
Bit 4
Bit 4
Bit 4
Bit 4
SI
Byte Count
1
0
0
0
Each transition
represents 8 bits
Bit 3
Bit 3
Bit 3
Bit 3
Product Version Code
1
0
0
0
Opcode
9FH
Density Code
Manufacturer ID
Bit 2
Bit 2
Bit 2
Bit 2
1
1
0
0
Byte n
1FH
Bit 1
Bit 1
Bit 1
Bit 1
Device ID
1
0
0
0
Byte 1
25H
Bit 0
Bit 0
Bit 0
Bit 0
1
1
0
0
Device ID
Byte 2
00H
String Length
Information
Extended
Device
00H
if the Extended Device Information String Length
This information would only be output
value was something other than 00H.
Family Code
Density Code
MLC Code
Product Version
Byte Count
Information
Extended
Device
Byte x
Data
Manufacturer ID
Information
Byte x + 1
Extended
Device
Data
00101 = 8-Mbit
00000 = Initial Version
00H = 0 Bytes of Information
001 = DataFlash
000 = 1-bit/Cell Technology
1FH = Atmel
3596I–DFLASH–4/08