AT45DB021D-MH-SL954 ATMEL [ATMEL Corporation], AT45DB021D-MH-SL954 Datasheet - Page 10

• Manufacturer Part Number: AT45DB021D-MH-SL954
• Description: 2-megabit 2.7-volt Minimum DataFlash
• Manufacturer: ATMEL [ATMEL Corporation]

Table 7-2.
7.7
10
PA9/
A17
0
0
0
1
1
•
•
•
Chip Erase
AT45DB021D
PA8/
A16
Sector Erase Addressing
0
0
1
0
1
•
•
•
PA7/
A15
0
0
1
0
1
•
•
•
The entire main memory can be erased at one time by using the Chip Erase command.
To execute the Chip Erase command, a 4-byte command sequence C7H, 94H, 80H and 9AH
must be clocked into the device. Since the entire memory array is to be erased, no address
bytes need to be clocked into the device, and any data clocked in after the opcode will be
ignored. After the last bit of the opcode sequence has been clocked in, the CS pin can be deas-
serted to start the erase process. The erase operation is internally self-timed and should take
place in a time of t
The Chip Erase command will not affect sectors that are protected or locked down; the contents
of those sectors will remain unchanged. Only those sectors that are not protected or locked
down will be erased.
The WP pin can be asserted while the device is erasing, but protection will not be activated until
the internal erase cycle completes.
Figure 7-1.
Command
Chip Erase
PA6/
A14
X
X
X
0
0
•
•
•
Chip Erase
CS
SI
PA5/
A13
CE
X
X
X
0
0
•
•
•
. During this time, the Status Register will indicate that the device is busy.
Each transition
represents 8 bits
PA4/
A12
X
X
X
0
0
•
•
•
Opcode
Byte 1
PA3/
A11
X
X
X
0
1
•
•
•
Byte 1
C7H
Opcode
Byte 2
PA2/
A10
X
X
X
X
X
•
•
•
Opcode
Byte 3
Byte 2
94H
PA1/
A9
X
X
X
X
X
•
•
•
Opcode
Byte 4
PA0/
A8
X
X
X
X
X
Byte 3
•
•
•
80H
3638F–DFLASH–4/08
Sector
0a
0b
5
6
7
Byte 4
•
•
•
9AH