AT25DF641A datasheet(14/57 Pages) ATMEL

14 / 57 page

8693A–DFLASH–8/10

Atmel AT25DF641A [Preliminary]

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 8-3.

Dual-Input Byte Program

Figure 8-4.

Dual-Input Page Program

8.3

Block Erase

A block of 4-, 32-, or 64-Kbytes can be erased (all bits set to the logical “1” state) in a single

operation by using one of three different opcodes for the Block Erase command. An opcode of

20h is used for a 4-Kbyte erase, an opcode of 52h is used for a 32-Kbyte erase, and an opcode

of D8h is used for a 64-Kbyte erase. Before a Block Erase command can be started, the Write

Enable command must have been previously issued to the device to set the WEL bit of the Sta-

tus Register to a logical “1” state.

To perform a Block Erase, the CS pin must first be asserted and the appropriate opcode (20h,

52h, or D8h) must be clocked into the device. After the opcode has been clocked in, the three

address bytes specifying an address within the 4-, 32-, or 64-Kbyte block to be erased must be

clocked in. Any additional data clocked into the device will be ignored. When the CS pin is deas-

serted, the device will erase the appropriate block. The erasing of the block is internally self-

timed and should take place in a time of t

BLKE.

SCK

SOI

MSB

10100010

410 11

812

31 32

29 30

OPCODE

AAAA

AAA

A A

ADDRESS BITS A23-A0

MSB

INPUT

DATA BYTE

HIGH-IMPEDANCE

SCK

SOI

MSB

10100010

410 11

812

37 38

31 32

29 30

OPCODE

AAAA

AAA

A A

MSB

ADDRESS BITS A23-A0

INPUT

DATA BYTE 1

MSB

INPUT

DATA BYTE n

INPUT

DATA BYTE 2

HIGH-IMPEDANCE

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