AT45DB642D datasheet(11/55 Pages) ATMEL

11 / 55 page

3542F–DFLASH–09/06

AT45DB642D

7.6

Sector Erase

The Sector Erase command can be used to individually erase any sector in the main memory.

There are 32 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 (1056 bytes), an opcode of 7CH must be

loaded into the device, followed by three address bytes comprised of 10 page address bits

(PA12 - PA3) and 14 don’t care bits. To perform a sector 1-31 erase, the opcode 7CH must be

loaded into the device, followed by three address bytes comprised of 5 page address bits (PA12

- PA8) and 19 don’t care bits. To perform sector 0a or sector 0b erase for the binary page size

(1024 bytes), an opcode of 7CH must be loaded into the device, followed by three address bytes

comprised of 1 don’t care bit and 10 page address bits (A22 - A13) and 13 don’t care bits. To

perform a sector 1-31 erase, the opcode 7CH must be loaded into the device, followed by three

address bytes comprised of 1 don’t care bit and 5 page address bits (PA12 - PA8) and 18 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 and the RDY/BUSY pin will indicate that the part

is busy.

7.7

Chip Erase(1)

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

PA12/

A22

PA11/

A21

PA10/

A20

PA9/

A19

PA8/

A18

PA7/

A17

PA6/

A16

PA5/

A15

PA4/

A14

PA3/

A13

PA2/

A12

PA1/

A11

PA0/

A10

Sector

000

XXX

•

XXX

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