AT45DB641E datasheet(22/78 Pages) RENESAS

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DS-AT45DB641E-027 Rev. O

Page 22

6/30/23

AT45DB641E Datasheet

7.9

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 33 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 erases the selected sector. The erase operation is internally

self-timed and takes place in a maximum time of tSE. During this time, the RDY/BUSY bit in the Status Register

indicates 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 is indicated by the EPE bit in the Status Register.

Table 3. Sector Erase Addressing

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

000000000000

000000000001

00001

XXXXX

00010

XXXXX

•••••••••••••••

•

•••••••••••••••

•

•••••••••••••••

•

11100

XXXXX

11101

XXXXX

11110

XXXXX

11111

XXXXX

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