AT25DF321-SU Atmel, AT25DF321-SU Datasheet - Page 6

• Manufacturer Part Number: AT25DF321-SU
• Description: IC FLASH 32MBIT 70MHZ 8SOIC
• Manufacturer: Atmel

Specifications of AT25DF321-SU

• Format - Memory: FLASH
• Memory Type: DataFLASH
• Memory Size: 32M (16384 pages x 256 Bytes)
• Speed: 70MHz
• Interface: SPI, 3-Wire Serial
• Voltage - Supply: 2.7 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 8-SOIC (5.3mm Width), 8-SOP, 8-SOEIAJ
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

5. Device Operation
6. Commands and Addressing
6
AT25DF321
The AT25DF321 is controlled by a set of instructions that are sent from a host controller, com-
monly referred to as the SPI Master. The SPI Master communicates with the AT25DF321 via the
SPI bus which is comprised of four signal lines: Chip Select (CS), Serial Clock (SCK), Serial
Input (SI), and Serial Output (SO).
The SPI protocol defines a total of four modes of operation (mode 0, 1, 2, or 3) with each mode
differing in respect to the SCK polarity and phase and how the polarity and phase control the
flow of data on the SPI bus. The AT25DF321 supports the two most common modes, SPI
Modes 0 and 3. The only difference between SPI Modes 0 and 3 is the polarity of the SCK signal
when in the inactive state (when the SPI Master is in standby mode and not transferring any
data). With SPI Modes 0 and 3, data is always latched in on the rising edge of SCK and always
output on the falling edge of SCK.
Figure 5-1.
A valid instruction or operation must always be started by first asserting the CS pin. After the CS
pin has been asserted, the SPI Master must then clock out a valid 8-bit opcode on the SPI bus.
Following the opcode, instruction dependent information such as address and data bytes would
then be clocked out by the SPI Master. All opcode, address, and data bytes are transferred with
the most significant bit (MSB) first. An operation is ended by deasserting the CS pin.
Opcodes not supported by the AT25DF321 will be ignored by the device and no operation will be
started. The device will continue to ignore any data presented on the SI pin until the start of the
next operation (CS pin being deasserted and then reasserted). In addition, if the CS pin is deas-
serted before complete opcode and address information is sent to the device, then no operation
will be performed and the device will simply return to the idle state and wait for the next
operation.
Addressing of the device requires a total of three bytes of information to be sent, representing
address bits A23-A0. Since the upper address limit of the AT25DF321 memory array is
3FFFFFh, address bits A23-A22 are always ignored by the device.
SCK
SO
CS
SI
SPI Mode 0 and 3
MSB
LSB
MSB
3669B–DFLASH–6/09
LSB