AT25DF641A datasheet(12/57 Pages) ATMEL

12 / 57 page

8693A–DFLASH–8/10

Atmel AT25DF641A [Preliminary]

The three address bytes and at least one complete byte of data must be clocked into the device

before the CS pin is deasserted, and the CS pin must be deasserted on even byte boundaries

(multiples of eight bits); otherwise, the device will abort the operation and no data will be pro-

grammed into the memory array. In addition, if the address specified by A23-A0 points to a

memory location within a sector that is in the protected state (see “Protect Sector” on page 21)

or locked down (see “Sector Lockdown” on page 28), then the Byte/Page Program command will

not be executed, and the device will return to the idle state once the CS pin has been deas-

serted. The WEL bit in the Status Register will be reset back to the logical “0” state if the

program cycle aborts due to an incomplete address being sent, an incomplete byte of data being

sent, the CS pin being deasserted on uneven byte boundaries, or because the memory location

to be programmed is protected or locked down.

While the device is programming, the Status Register can be read and will indicate that the

device is busy. For faster throughput, it is recommended that the Status Register be polled

rather than waiting the t

BP or tPP time to determine if the data bytes have finished programming.

At some point before the program cycle completes, the WEL bit in the Status Register will be

reset back to the logical “0” state.

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 will be indicated by the EPE

bit in the Status Register.

Figure 8-1.

Byte Program

Figure 8-2.

Page Program

SCK

MSB

00000010

410 11

812

37 38

31 32

29 30

OPCODE

HIGH-IMPEDANCE

AAAA

AAA

A A

MSB

DDDDDDD D

ADDRESS BITS A23-A0

DATA IN

SCK

MSB

00000010

839

37 38

31 32

29 30

OPCODE

HIGH-IMPEDANCE

AAA

MSB

DDDDDDD D

ADDRESS BITS A23-A0

DATA IN BYTE 1

MSB

DDDDDDD D

DATA IN BYTE n

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