AT25DF641-MWH-Y Atmel, AT25DF641-MWH-Y Datasheet - Page 23

• Manufacturer Part Number: AT25DF641-MWH-Y
• Description: IC FLASH 64MBIT 100MHZ 8VDFN
• Manufacturer: Atmel

Specifications of AT25DF641-MWH-Y

• Format - Memory: FLASH
• Memory Type: DataFLASH
• Memory Size: 64M (32K pages x 256 bytes)
• Speed: 100MHz
• Interface: SPI, 3-Wire Serial
• Voltage - Supply: 2.7 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 8-VDFN
• Architecture: Sectored
• Interface Type: SPI Serial
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 2.7 V
• Maximum Operating Current: 19 mA
• Mounting Style: SMD/SMT
• Organization: 64 KB x 128
• Cell Type: NOR
• Density: 64Mb
• Access Time (max): 5ns
• Boot Type: Not Required
• Address Bus: 1b
• Operating Supply Voltage (typ): 3.3V
• Operating Temp Range: -40C to 85C
• Package Type: VDFN
• Sync/async: Synchronous
• Operating Temperature Classification: Industrial
• Operating Supply Voltage (min): 2.7V
• Operating Supply Voltage (max): 3.6V
• Supply Current: 19mA
• Mounting: Surface Mount
• Pin Count: 8
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

8.4.
3680F–DFLASH–4/10
Before the Protect Sector command can be issued, the Write Enable command must have been previously issued
to set the WEL bit in the Status Register to a logical “1”. To issue the Protect Sector command, the
first be asserted and the opcode of 36h must be clocked into the device followed by three address bytes
designating any address within the sector to be protected. Any additional data clocked into the device will be
ignored. When the
addressed by A23-A0 will be set to the logical “1” state, and the sector itself will then be protected from program
and erase operations. In addition, the WEL bit in the Status Register will be reset back to the logical “0” state.
The complete three address bytes must be clocked into the device before the
pin must be deasserted on an even byte boundary (multiples of eight bits); otherwise, the device will abort the
operation. When the device aborts the Protect Sector operation, the state of the Sector Protection Register will be
unchanged, and the WEL bit in the Status Register will be reset to a logical “0”.
As a safeguard against accidental or erroneous protecting or unprotecting of sectors, the Sector Protection
Registers can themselves be locked from updates by using the SPRL (Sector Protection Registers Locked) bit of
the Status Register (please refer to the Status Register Commands description for more details). If the Sector
Protection Registers are locked, then any attempts to issue the Protect Sector command will be ignored, and the
device will reset the WEL bit in the Status Register back to a logical “0” and return to the idle state once the
pin has been deasserted.
Figure 8-3.
Unprotect Sector
Issuing the Unprotect Sector command to a particular sector address will reset the corresponding Sector
Protection Register to the logical “0” state (see Table 8-1 for Sector Protection Register values). Every physical
sector of the device has a corresponding single-bit Sector Protection Register that is used to control the software
protection of a sector.
Before the Unprotect Sector command can be issued, the Write Enable command must have been previously
issued to set the WEL bit in the Status Register to a logical “1”. To issue the Unprotect Sector command, the
pin must first be asserted and the opcode of 39h must be clocked into the device. After the opcode has been
clocked in, the three address bytes designating any address within the sector to be unprotected must be clocked
in. Any additional data clocked into the device after the address bytes will be ignored. When the
deasserted, the Sector Protection Register corresponding to the sector addressed by A23-A0 will be reset to the
logical “0” state, and the sector itself will be unprotected. In addition, the WEL bit in the Status Register will be
reset back to the logical “0” state.
SCK
SO
CS
SI
Protect Sector
MS B
HIG H-IMP E DANC E
CS
0
0
0
1
pin is deasserted, the Sector Protection Register corresponding to the physical sector
1
2
OP C ODE
1
3
0
4
1
5
1
6
0
7
MS B
A
8
A
9
A
10 11
A
ADDR E S S B IT S A23-A0
A
12
A
A
26
A
27 28
A
A
29 30
A
A
31
Atmel AT25DF641
CS
pin is deasserted, and the
CS
CS
pin must
pin is
CS
CS
CS
23