AT45DB081D datasheet(10/53 Pages) ATMEL

10 / 53 page

3596E–DFLASH–02/07

AT45DB081D

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 DataFlash standard page size (264 bytes), an opcode of 7CH must be

loaded into the device, followed by three address bytes comprised of 3 don’t care bits, 9 page

address bits (PA11 - PA3) 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 bits, 4 page address bits (PA11 - PA8) and 17 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 4 don’t care bit and 9 page address

bits (A19 - A11) and 11 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 4 don’t care bit and 4 page

address bits (A19 - A16) 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.

7.7

Chip Erase

The entire main memory can be erased at one time by using the Chip Erase command.

To execute the Chip Erase command, a 4-byte command sequence C7H, 94H, 80H and 9AH

must be clocked into the device. Since the entire memory array is to be erased, no address

bytes need to be clocked into the device, and any data clocked in after the opcode will be

ignored. After the last bit of the opcode sequence has been clocked in, the CS pin can be deas-

serted to start the erase process. The erase operation is internally self-timed and should take

place in a time of t

CE. During this time, the Status Register will indicate that the device is busy.

The Chip Erase command will not affect sectors that are protected or locked down; the contents

of those sectors will remain unchanged. Only those sectors that are not protected or locked

down will be erased.

Table 7-2.

Sector Erase Addressing

PA11/

A19

PA10/

A18

PA9/

A17

PA8/

A16

PA7/

A15

PA6/

A14

PA5/

A13

PA4/

A12

PA3/

A11

PA2/

A10

PA1/

PA0/

Sector

000000

000

000000

001

0001

XXXXXX

0010

XXXXXX

•

1100

XXXXXX

1101

XXXXXX

1110

XXXXXX

1111

XXXXXX

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