AT45DB642D-CNU SL954 Atmel, AT45DB642D-CNU SL954 Datasheet - Page 21

• Manufacturer Part Number: AT45DB642D-CNU SL954
• Manufacturer: Atmel

Specifications of AT45DB642D-CNU SL954

• Density: 64Mb
• Access Time (max): 6ns
• Interface Type: Parallel/Serial-SPI
• Address Bus: 1/8Bit
• Operating Supply Voltage (typ): 3.3V
• Operating Temp Range: -40C to 85C
• Package Type: CASON
• Program/erase Volt (typ): 2.7 to 3.6V
• Sync/async: Synchronous
• Operating Temperature Classification: Industrial
• Operating Supply Voltage (min): 2.7V
• Operating Supply Voltage (max): 3.6V
• Word Size: 8b
• Number Of Words: 8M
• Supply Current: 15mA
• Mounting: Surface Mount
• Pin Count: 8
• Lead Free Status / Rohs Status: Compliant

Figure 10-3. Program Security Register
10.2.2
Figure 10-4. Read Security Register
3542K–DFLASH–04/09
SO or IO
SI or IO
SI or IO
Reading the Security Register
7
7
- IO
- IO
CS
7
- IO
CS
0
0
0
Each transition
represents 8 bits
Each transition
represents 8 bits
The Security Register can be read by first asserting the CS pin and then clocking in an opcode
of 77H followed by three dummy bytes if using the serial interface and seven dummy bytes if
using the 8-bit interface. After the last don't care bit has been clocked in, the content of the
Security Register can be clocked out on the SO or I/O7 - I/O0 pins. After the last byte of the
Security Register has been read, additional pulses on the SCK/CLK pin will simply result in
undefined data being output on the SO or I/O7 - I/O0 pins.
Deasserting the CS pin will terminate the Read Security Register operation and put the SO or
I/O7 - I/O0 pins into a high-impedance state.
Opcode
Opcode
Byte 1
Opcode
Byte 2
X
Opcode
Byte 3
X
Opcode
Byte 4
X
Data Byte
n
Data Byte
n
Data Byte
n + 1
Data Byte
n + 1
Data Byte
n + x
Data Byte
n + x
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