6 sector erase – Rainbow Electronics AT45DB011D User Manual
Page 9
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3639J–DFLASH–11/2012
AT45DB011D
7.6
Sector Erase
The Sector Erase command can be used to individually erase any sector in the main memory.
There are four sectors and only one sector can be erased at one time. To perform sector 0a or
sector 0b erase for the DataFlash standard page size (264-bytes), an opcode of 7CH must be
loaded into the device, followed by three address bytes comprised of five don’t care bits, seven-
page address bits (PA9 - PA3) and 12 don’t care bits. To perform a sector 1-3 erase, the opcode
7CH must be loaded into the device, followed by three address bytes comprised of six don’t care
bits, two page address bits (PA8 - PA7) and 16 don’t care bits. To perform sector 0a or sector 0b
erase for the binary page size (256-bytes), an opcode of 7CH must be loaded into the device,
followed by three address bytes comprised of six don’t care bits and seven page address bits
(A17 - A11) and 11 don’t care bits. To perform a sector 1-3 erase, the opcode 7CH must be
loaded into the device, followed by three address bytes comprised of seven don’t care bit and
two page address bits (A16 - A15) and 16 don’t care bits. The page address bits are used to
specify any valid address location within the sector which is to be erased. When a low-to-high
transition occurs on the CS pin, the part will erase the selected sector. The erase operation is
internally self-timed and should take place in a maximum time of t
SE
. During this time, the status
register will indicate that the part is busy.
Table 7-1.
Block Erase Addressing
PA8/
A16
PA7/
A15
PA6/
A14
PA5/
A13
PA4/
A12
PA3/
A11
PA2/
A10
PA1/
A9
PA0/
A8
Block
0
0
0
0
0
0
X
X
X
0
0
0
0
0
0
1
X
X
X
1
0
0
0
0
1
0
X
X
X
2
0
0
0
0
1
1
X
X
X
3
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
1
1
1
1
0
0
X
X
X
60
1
1
1
1
0
1
X
X
X
61
1
1
1
1
1
0
X
X
X
62
1
1
1
1
1
1
X
X
X
63
Table 7-2.
Sector Erase Addressing
PA8/
A16
PA7/
A15
PA6/
A14
PA5/
A13
PA4/
A12
PA3/
A11
PA2/
A10
PA1/
A9
PA0/
A8
Sector
0
0
0
0
0
0
X
X
X
0a
0
0
0
0
0
1
X
X
X
0b
0
1
0
0
0
0
0
0
0
1
1
0
X
X
X
X
X
X
X
2
1
1
X
X
X
X
X
X
X
3