AT45DB321D datasheet(10/54 Pages) ATMEL

10 / 54 page

3597J–DFLASH–4/08

AT45DB321D

7.6

Sector Erase

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

There are 64 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 (528 bytes), an opcode of 7CH 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. To perform a sector 1-63 erase, the opcode

7CH must be loaded into the device, followed by three address bytes comprised of 1 don’t

care bit, 4 page address bits (PA12 - PA9) and 19 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 2 don’t care bit and 10 page address bits

(A21 - A12) and 12 don’t care bits. To perform a sector 1-63 erase, the opcode 7CH must be

loaded into the device, followed by three address bytes comprised of 2 don’t care bits and

4 page address bits (A21 - A18) and 18 don’t care bits. The page address bits are used to spec-

ify 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

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.

Note:

1. Refer to the errata regarding Chip Erase on page 53.

Table 7-2.

Sector Erase Addressing

PA12/

A21

PA11/

A20

PA10/

A19

PA9/

A18

PA8/

A17

PA7/

A16

PA6/

A15

PA5/

A14

PA4/

A13

PA3/

A12

PA2/

A11

PA1/

A10

PA0/

Sector

00000

000

00000

001

0001

XXXX

XXX

0010

XXXX

XXX

•

1100

XXXX

XXX

1101

XXXX

XXX

1110

XXXX

XXX

1111

XXXX

XXX

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