AT25DF041A-SSH-B datasheet(10/41 Pages) ATMEL

Part #	AT25DF041A-SSH-B

Description	4-megabit 2.3-volt or 2.7-volt Minimum SPI Serial Flash Memory

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Manufacturer	ATMEL [ATMEL Corporation]

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10

3668D–DFLASH–9/08

AT25DF041A

The Byte/Page Program mode is the default programming mode after the device powers-up or

resumes from a device reset.

Figure 8-1.

Byte Program

Figure 8-2.

Page Program

8.2

Sequential Program Mode

The Sequential Program Mode improves throughput over the Byte/Page Program command

when the Byte/Page Program command is used to program single bytes only into consecutive

address locations. For example, some systems may be designed to program only a single byte

of information at a time and cannot utilize a buffered Page Program operation due to design

restrictions. In such a case, the system would normally have to perform multiple Byte Program

operations in order to program data into sequential memory locations. This approach can add

considerable system overhead and SPI bus traffic.

The Sequential Programming Mode helps reduce system overhead and bus traffic by incorporat-

ing an internal address counter that keeps track of the byte location to program, thereby

eliminating the need to supply an address sequence to the device for every byte to program.

When using the Sequential Program mode, all address locations to be programmed must be in

the erased state. Before the Sequential Program mode can first be entered, the Write Enable

command must have been previously issued to the device to set the WEL bit of the Status Reg-

ister to a logical “1” state.

To start the Sequential Program Mode, the CS pin must first be asserted, and either an opcode

of ADh or AFh must be clocked into the device. For the first program cycle, three address bytes

must be clocked in after the opcode to designate the first byte location to program. After the

address bytes have been clocked in, the byte of data to be programmed can be sent to the

SCK

CS

SI

SO

MSB

23

1

0

00000010

67

5

410 11

9

812

39

37 38

33

36

35

34

31 32

29 30

OPCODE

HIGH-IMPEDANCE

AAAA

AAA

A

MSB

DDDDDDD

D

ADDRESS BITS A23-A0

DATA IN

SCK

CS

SI

SO

MSB

23

1

0

00000010

67

5

49

839

37 38

33

36

35

34

31 32

29 30

OPCODE

HIGH-IMPEDANCE

AA

AAA

A

MSB

DDDDDDD

D

ADDRESS BITS A23-A0

DATA IN BYTE 1

MSB

DDDDDDD

D

DATA IN BYTE n

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