AT45DB321E datasheet(13/73 Pages) ETC2

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AT45DB321E

8784F–DFLASH–11/2013

Table 6-1.

Block Erase Addressing

6.8

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 64 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 (528 bytes), an opcode of 7Ch must be clocked into the

device followed by three address bytes comprised of one dummy bit, 10 page address bits (PA12 - PA3), and

13 dummy bits. To perform a Sector 1-63 erase, an opcode of 7Ch must be clocked into the device followed by three

address bytes comprised of one dummy bit, six page address bits (PA12 - PA7), and 17 dummy bits.

To perform a Sector 0a or Sector 0b erase with the binary page size (512 bytes), an opcode of 7Ch must be clocked into

the device followed by three address bytes comprised of two dummy bits, 10 page address bits (A21 - A12), and

12 dummy bits. To perform a Sector 1-63 erase, an opcode of 7Ch must be clocked into the device followed by two

dummy bits, six page address bits (A21 - A16), and 16 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 tSE. 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.

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/

Block

•

1020

1021

1022

1023

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