AT45DB321D ATMEL [ATMEL Corporation], AT45DB321D Datasheet - Page 9

• Manufacturer Part Number: AT45DB321D
• Description: 32-megabit 2.7-volt DataFlash
• Manufacturer: ATMEL [ATMEL Corporation]

7.4
7.5
Table 7-1.
3597J–DFLASH–4/08
PA12/
A21
0
0
0
0
1
1
1
1
•
•
•
Page Erase
Block Erase
PA11/
A20
0
0
0
0
1
1
1
1
•
•
•
Block Erase Addressing
PA10/
A19
0
0
0
0
1
1
1
1
•
•
•
The Page Erase command can be used to individually erase any page in the main memory array
allowing the Buffer to Main Memory Page Program to be utilized at a later time. To perform a
page erase in the DataFlash standard page size (528 bytes), an opcode of 81H must be loaded
into the device, followed by three address bytes comprised of 1 don’t care bit, 13 page address
bits (PA12 - PA0) that specify the page in the main memory to be erased and 10 don’t care bits.
To perform a page erase in the binary page size (512 bytes), the opcode 81H must be loaded
into the device, followed by three address bytes consist of 2 don’t care bits, 13 page address bits
(A21 - A9) that specify the page in the main memory to be erased and 9 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 maxi-
mum time of t
part is busy.
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 DataFlash standard 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 opcode 50H 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
PA9/
A18
. During this time, the status register and the RDY/BUSY pin will indicate that the part is busy.
0
0
0
0
1
1
1
1
•
•
•
PA8/
A17
0
0
0
0
1
1
1
1
•
•
•
PE
. During this time, the status register and the RDY/BUSY pin will indicate that the
PA7/
A16
0
0
0
0
1
1
1
1
•
•
•
PA6/
A15
0
0
0
0
1
1
1
1
•
•
•
PA5/
A14
0
0
0
0
1
1
1
1
•
•
•
PA4/
A13
0
0
1
1
0
0
1
1
•
•
•
PA3/
A12
0
1
0
1
0
1
0
1
•
•
•
PA2/
A11
X
X
X
X
X
X
X
X
•
•
•
PA1/
A10
AT45DB321D
X
X
X
X
X
X
X
X
•
•
•
PA0/
A9
X
X
X
X
X
X
X
X
•
•
•
Block
1020
1021
1022
1023
0
1
2
3
•
•
•
9