AT45DB321D datasheet(3/57 Pages) ATMEL

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3597N–DFLASH–04/09

AT45DB321D

Table 2-1.

Pin Configurations

Symbol

Name and Function

Asserted

State

Type

Chip Select: Asserting the CS pin selects the device. When the CS pin is deasserted, the device

will be deselected and normally be placed in the standby mode (not Deep Power-Down mode),

and the output pin (SO) will be in a high-impedance state. When the device is deselected, data

will not be accepted on the input pin (SI).

A high-to-low transition on the CS pin is required to start an operation, and a low-to-high

transition is required to end an operation. When ending an internally self-timed operation such as

a program or erase cycle, the device will not enter the standby mode until the completion of the

operation.

Low

Input

SCK

Serial Clock: This pin is used to provide a clock to the device and is used to control the flow of

data to and from the device. Command, address, and input data present on the SI pin is always

latched on the rising edge of SCK, while output data on the SO pin is always clocked out on the

falling edge of SCK.

–

Input

Serial Input: The SI pin is used to shift data into the device. The SI pin is used for all data input

including command and address sequences. Data on the SI pin is always latched on the rising

edge of SCK.

–

Input

Serial Output: The SO pin is used to shift data out from the device. Data on the SO pin is always

clocked out on the falling edge of SCK.

–

Output

Write Protect: When the WP pin is asserted, all sectors specified for protection by the Sector

Protection Register will be protected against program and erase operations regardless of

whether the Enable Sector Protection command has been issued or not. The WP pin functions

independently of the software controlled protection method. After the WP pin goes low, the

content of the Sector Protection Register cannot be modified.

If a program or erase command is issued to the device while the WP pin is asserted, the device

will simply ignore the command and perform no operation. The device will return to the idle state

once the CS pin has been deasserted. The Enable Sector Protection command and Sector

Lockdown command, however, will be recognized by the device when the WP pin is asserted.

The WP pin is internally pulled-high and may be left floating if hardware controlled protection will

not be used. However, it is recommended that the WP pin also be externally connected to VCC

whenever possible.

Low

Input

RESET

Reset: A low state on the reset pin (RESET) will terminate the operation in progress and reset

the internal state machine to an idle state. The device will remain in the reset condition as long as

a low level is present on the RESET pin. Normal operation can resume once the RESET pin is

brought back to a high level.

The device incorporates an internal power-on reset circuit, so there are no restrictions on the

RESET pin during power-on sequences. If this pin and feature are not utilized it is recommended

that the RESET pin be driven high externally.

Low

Input

RDY/BUSY

Ready/Busy: This open drain output pin will be driven low when the device is busy in an

internally self-timed operation. This pin, which is normally in a high state (through an external

pull-up resistor), will be pulled low during programming/erase operations, compare operations,

and page-to-buffer transfers.

The busy status indicates that the Flash memory array and one of the buffers cannot be

accessed; read and write operations to the other buffer can still be performed.

–

Output

VCC

Device Power Supply: The VCC pin is used to supply the source voltage to the device.

Operations at invalid VCC voltages may produce spurious results and should not be attempted.

–Power

GND

Ground: The ground reference for the power supply. GND should be connected to the system

ground.

–

Ground

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