AT45DB641E datasheet(21/78 Pages) RENESAS

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DS-AT45DB641E-027 Rev. O

Page 21

6/30/23

AT45DB641E Datasheet

7.8

Block Erase

The Block Erase command can be used to erase a block of eight pages at one time. This command is useful when

needing to pre-erase larger amounts of memory and is more efficient than issuing eight separate Page Erase

commands.

To perform a Block Erase with the standard DataFlash page size (264 bytes), an opcode of 50h must be clocked

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

bits. The 12 page address bits are used to specify which block of 8 pages is to be erased.

To perform a Block Erase with the binary page size (256 bytes), an opcode of 50h 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.

The 12 page address bits are used to specify which block of 8 pages is to be erased.

When a low-to-high transition occurs on the CS pin, the device erases the selected block of eight pages. The

erase operation is internally self-timed and takes place in a maximum time of tBE. During this time, the RDY/BUSY

bit in the Status Register indicates that the device is busy.

The device also incorporates an intelligent erase 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 2. Block Erase Addressing

PA14

PA13

PA12

PA11/

PA10

PA9/

PA8/

PA7/

PA6/

PA5/

PA4/

PA3/

PA2/

PA1/

PA0/

Block

/A22

/A21

/A20

A19

/A18

A17

A16

A15

A14

A13

A12

A11

A10

000

00000

000

00001

000

00010

000

00011

•

••••••

•••••

•

••••••

•••••

•

••••••

•••••

•

111

11100

4092

111

11101

4093

111

11110

4094

111

11111

4095

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