AT25DF021A datasheet(20/59 Pages) RENESAS

20 / 59 page

DS-AT25DF021A-042 Rev. J

Page 20

12/22/22

AT25DF021A Datasheet

The device also incorporates an intelligent programming algorithm that can detect when a byte location fails to

program properly. If a programming error arises, it is indicated by the EPE bit in the Status Register.

Figure 15. Sequential Program Mode – Status Register Polling

Figure 16. Sequential Program Mode – Waiting Maximum Byte Program Time

8.4

Page Erase

Page Erase for 2Mbit, 1024 Pages [ten (10) page address bits, PA<9:0>] of 256Bytes each.

The Page Erase command can be used to individually erase any page in the main memory array. The Main

Memory Byte/Page Program command can be utilized at a later time.

To perform a Page Erase with the standard page size (256 bytes), an opcode of 81h must be clocked into the

device followed by three address bytes comprised of:

Byte 0: 81h the page erase command code

Byte 1: XXXX XX, PA9, PA8; which is six (6) dummy bits and two (2) page address bits

Byte 2: PA<7:0>; which is eight (8) page address bits

Byte 3: XXXX XXXX; which is eight (8) dummy bits

When a low-to-high transition occurs on the CS pin, the device will erase the selected page (the erased state is a

Logic 1). The erase operation is internally self-timed and should take place in a maximum time of tPE. During this

time, the RDY/BUSY bit in the Status Register will indicate 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 will be indicated by the EPE bit in the Status Register.

Opcode A23-16

A15-8

A7-0

05h

Data

High-Impedance

Opcode

Data

05h

04h

Opcode

Data

05h

STATUS REGISTER

DATA

STATUS REGISTER

DATA

STATUS REGISTER

DATA

Seqeuntial Program Mode

Command

First Address to Program

Status Register Read

Command

Write Disable

Command

Seqeuntial Program Mode

Command

Seqeuntial Program Mode

Command

Note: Each transition

shown for SI represents one byte (8 bits)

Opcode A23-16

A15-8

A7-0

Data

High-Impedance

Opcode

Data

04h

Opcode

Data

Seqeuntial Program Mode

Command

First Address to Program

Write Disable

Command

Seqeuntial Program Mode

Command

Seqeuntial Program Mode

Command

Note: Each transition

shown for SI represents one byte (8 bits)

tBP

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