AT45DB641E datasheet(14/69 Pages) RENESAS

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AT45DB641E

DS-45DB641E-027N–DFLASH–2/2022

6.9

Sector Erase

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

The main memory array is comprised of thirty-three sectors, and only one sector can be erased at a time. To perform an

erase of Sector 0a or Sector 0b with the standard DataFlash page size (264 bytes), an opcode of 7Ch must be clocked

into the device followed by three address bytes comprised of 12 page address bits (PA14 - PA3), and

12 dummy bits. To perform a Sector 1-31 erase, an opcode of 7Ch must be clocked into the device followed by three

address bytes comprised of 5 page address bits (PA14 - PA10), and 19 dummy bits.

To perform a Sector 0a or Sector 0b erase with the binary page size (256 bytes), an opcode of 7Ch must be clocked into

the device followed by three address bytes comprised of 1 dummy bit, 12 page address bits (A22 - A11), and

11 dummy bits. To perform a Sector 1-31 erase, an opcode of 7Ch must be clocked into the device followed by 1 dummy

bit, 5 page address bits (A22 - A18), and 18 dummy bits.

The page address bits are used to specify any valid address location within the sector to be erased. When a

low-to high transition occurs on the CS pin, the device 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 RDY/BUSY bit in the Status Register will

indicate that the device is busy.

The device also incorporates an intelligent algorithm that can detect when a byte location fails to erase properly. If an

erase error arises, it will be indicated by the EPE bit in the Status Register.

Table 6-2.

Sector Erase Addressing

6.10

Chip Erase

The Chip Erase command allows the entire main memory array to be erased can be erased at one time.

To execute the Chip Erase command, a 4-byte command sequence of 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

must be deasserted 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 RDY/BUSY bit in 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.

PA14

/A22

PA13

/A21

PA12

/A20

PA11/

A19

PA10

/A18

PA9/

A17

PA8/

A16

PA7/

A15

PA6/

A14

PA5/

A13

PA4/

A12

PA3/

A11

PA2/

A10

PA1/

PA0/

Sector

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