AT45DB021D_09 datasheet(8/54 Pages) ATMEL

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3638I–DFLASH–04/09

AT45DB021D

the part will first erase the selected page in main memory (the erased state is a logic 1) and then

program the data stored in the buffer into the specified page in main memory. Both the erase

and the programming of the page are internally self-timed and should take place in a maximum

time of tEP. During this time, the status register will indicate that the part is busy.

7.3

Buffer to Main Memory Page Program without Built-in Erase

A previously-erased page within main memory can be programmed with the contents of the buf-

fer. A 1-byte opcode, 88H, must be clocked into the device. For the DataFlash standard page

size (264 bytes), the opcode must be followed by three address bytes consist of 5 don’t care

bits, 10 page address bits (PA9 - PA0) that specify the page in the main memory to be written

and 9 don’t care bits. To perform a buffer to main memory page program without built-in erase

for the binary page size (256 bytes), the opcode 88H must be clocked into the device followed

by three address bytes consisting of 6 don’t care bits, 10 page address bits (A17 - A8) that spec-

ify the page in the main memory to be written and 8 don’t care bits. When a low-to-high transition

occurs on the CS pin, the part will program the data stored in the buffer into the specified page in

the main memory. It is necessary that the page in main memory that is being programmed has

been previously erased using one of the erase commands (Page Erase or Block Erase). The

programming of the page is internally self-timed and should take place in a maximum time of tP.

During this time, the status register will indicate that the part is busy.

7.4

Page Erase

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 (264 bytes), an opcode of 81H must be loaded

into the device, followed by three address bytes comprised of 5 don’t care bits, 10 page address

bits (PA9 - PA0) that specify the page in the main memory to be erased and 9 don’t care bits. To

perform a page erase in the binary page size (256 bytes), the opcode 81H must be loaded into

the device, followed by three address bytes consist of 6 don’t care bits, 10 page address bits

(A17 - A8) that specify the page in the main memory to be erased and 8 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 tPE. During this time, the status register 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 DataFlash standard page size (264 bytes), an opcode of 50H

must be loaded into the device, followed by three address bytes comprised of 5 don’t care bits,

7 page address bits (PA9 -PA3) and 12 don’t care bits. The 7 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 (256 bytes), the opcode 50H must be loaded into the device, followed by three address

bytes consisting of 6 don’t care bits, 7 page address bits (A17 - A11) and 11 don’t care bits. The

9 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 tBE. During

this time, the status register will indicate that the part is busy.

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