5 block erase, 6 sector erase – Rainbow Electronics AT45DB161D User Manual
Page 9
9
3500O–DFLASH–11/2012
AT45DB161D
page address bits (A20 - A9) that specify the page in the main memory to be erased and nine don’t care bits. When
a low-to-high transition occurs on the CS pin, the part will erase the selected page (the erased state is a logical 1).
The erase operation is internally self-timed and should take place in a maximum time of t
PE
. During this time, the
status register and the RDY/BUSY pin will indicate that the part is busy.
7.5
Block Erase
A block of eight pages can be erased at one time. This command is useful when large amounts of data has 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 two don’t care bits, nine page address bits (PA11 -PA3) and 13 don’t care bits. The
nine 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 opcode 50H must be loaded into the device, followed by three address bytes
consisting of three don’t care bits, nine page address bits (A20 - A12) and 12 don’t care bits. The nine 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 7-1.
Block Erase Addressing
7.6
Sector Erase
The Sector Erase command can be used to individually erase any sector in the main memory. There are 16
sectors and only one sector can be erased at one time. To perform 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 two don’t care bits, nine page address bits (PA11 - PA3) and 13 don’t care bits. To perform a
sector 1-15 erase, the opcode 7CH must be loaded into the device, followed by three address bytes comprised of
two don’t care bits, four page address bits (PA11 - PA8) and 18 don’t care bits. To perform 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 three don’t care bit and nine page address bits (A20 - A12) and 12 don’t care bits. To
perform a sector 1-15 erase, the opcode 7CH must be loaded into the device, followed by three address bytes
comprised of 3 don’t care bit and four page address bits (A20 - A17) and 17 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
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
0
0
0
0
0
X
X
X
0
0
0
0
0
0
0
0
0
1
X
X
X
1
0
0
0
0
0
0
0
1
0
X
X
X
2
0
0
0
0
0
0
0
1
1
X
X
X
3
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
1
1
1
1
1
1
1
0
0
X
X
X
508
1
1
1
1
1
1
1
0
1
X
X
X
509
1
1
1
1
1
1
1
1
0
X
X
X
510
1
1
1
1
1
1
1
1
1
X
X
X
511