AT25DF641A-MH-T ATMEL [ATMEL Corporation], AT25DF641A-MH-T Datasheet - Page 12

• Manufacturer Part Number: AT25DF641A-MH-T
• Description: 64-Mbit 2.7V Minimum Serial Peripheral Interface Serial Flash Memory
• Manufacturer: ATMEL [ATMEL Corporation]

Figure 8-1.
Figure 8-2.
12
SCK
SO
CS
SI
Atmel AT25DF641A [Preliminary]
Byte Program
Page Program
SCK
SO
CS
SI
HIGH-IMPEDANCE
MSB
0
0
0
1
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
or locked down (see
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
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.
0
2
OPCODE
0
HIGH-IMPEDANCE
MSB
3
0
0
0
4
0
1
0
5
0
2
OPCODE
1
6
0
3
0
7
0
MSB
4
A
ADDRESS BITS A23-A0
8
0
5
A
9
1
6
“Sector Lockdown” on page
A
0
7
BP
MSB
A
8
or t
A
A
29 30
9
ADDRESS BITS A23-A0
PP
A
A
10 11
A
A
time to determine if the data bytes have finished programming.
31 32
MSB
A
D
12
A
D
33
DATA IN BYTE 1
D
34
D
35
A
29 30
D
36
A
D
37 38
28), then the Byte/Page Program command will
A
31 32
D
MSB
D
D
39
D
33
D
34
DATA IN
D
35
MSB
D
D
36
D
DATA IN BYTE n
D
37 38
D
“Protect Sector” on page
D
D
D
39
D
D
D
D
8693A–DFLASH–8/10
21)