5.5
Block Erase
A block of eight pages can be erased at one time. This command is useful when large amounts of data have to be written into
the device. This will avoid using multiple page erase commands. To perform a block erase for the standard DataFlash page size
(528-bytes), an opcode of 50H must be loaded into the device, followed by three address bytes comprised of 1 don’t care bit,
10 page address bits (PA12-PA3), and 13 don’t care bits. The 10 page address bits are used to specify which block of eight
pages is to be erased. To perform a block erase for the binary page size (512 bytes), the 50H opcode must be loaded into the
device, followed by three address bytes consisting of 2 don’t care bits, 10 page address bits (A21 - A12), and 12 don’t care bits.
The 10 page address bits are used to specify which block of eight pages is to be erased. When a low-to-high transition occurs
on the CS pin, the part will erase the selected block of eight pages. The erase operation is internally self-timed, and should take
place in a maximum time of t
BE
. During this time, the status register and the RDY/BUSY pin will indicate that the part is busy.
Table 5-1.
PA12/
A21
Block Erase Addressing
PA11/
A20
PA10/
A19
PA9/
A18
PA8/
A17
PA7/
A16
PA6/
A15
PA5/
A14
PA4/
A13
PA3/
A12
PA2/
A11
PA1/
A10
PA0/
A9
Block
0
0
0
0
●
●
●
1
1
1
1
0
0
0
0
●
●
●
1
1
1
1
0
0
0
0
●
●
●
1
1
1
1
0
0
0
0
●
●
●
1
1
1
1
0
0
0
0
●
●
●
1
1
1
1
0
0
0
0
●
●
●
1
1
1
1
0
0
0
0
●
●
●
1
1
1
1
0
0
0
0
●
●
●
1
1
1
1
0
0
1
1
●
●
●
0
0
1
1
0
1
0
1
●
●
●
0
1
0
1
X
X
X
X
●
●
●
X
X
X
X
X
X
X
X
●
●
●
X
X
X
X
X
X
X
X
●
●
●
X
X
X
X
0
1
2
3
●
●
●
1020
1021
1022
1023
5.6
Sector Erase
The sector erase command can be used to individually erase any sector in the main memory. There are 64 sectors, and only
one sector can be erased at a time. To perform a sector 0a or sector 0b erase for the standard DataFlash page size (528 bytes),
an opcode of 7CH must be loaded into the device, followed by three address bytes comprised of 1 don’t care bit, 10 page
address bits (PA12 - PA3), and 13 don’t care bits. To perform a sector 1-63 erase, the 7CH opcode must be loaded into the
device, followed by three address bytes comprised of 1 don’t care bit, 6 page address bits (PA12 - PA7), and 17 don’t care bits.
To perform a sector 0a or sector 0b erase for the binary page size (512 bytes), an opcode of 7CH must be loaded into the
device, followed by three address bytes comprised of 2 don’t care bits, 10 page address bits (A21 - A12), and 12 don’t care bits.
To perform a sector 1-63 erase, the 7CH opcode must be loaded into the device, followed by three address bytes comprised of
2 don’t care bits, 6 page address bits (A21 - A16), and 16 don’t care bits. The page address bits are used to specify any valid
address location within the sector 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 and the RDY/BUSY pin will indicate that the part is busy.
Atmel AT45DB321D
3597Q–DFLASH–6/11
8
ATMEL [ ATMEL CORPORATION ]
