AT25DF081A datasheet(10/54 Pages) ETC2

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8715C–SFLSH–1/2013

AT25DF081A

7.2

Dual-Output Read Array

The Dual-Output Read Array command is similar to the standard Read Array command and can be used to

sequentially read a continuous stream of data from the device by simply providing the clock signal once the initial

starting address has been specified. Unlike the standard Read Array command, however, the Dual-Output Read

Array command allows two bits of data to be clocked out of the device on every clock cycle rather than just one.

The Dual-Output Read Array command can be used at any clock frequency up to the maximum specified by fRDDO.

To perform the Dual-Output Read Array operation, the CS pin must first be asserted and the opcode of 3Bh must

be clocked into the device. After the opcode has been clocked in, the three address bytes must be clocked in to

specify the starting address location of the first byte to read within the memory array. Following the three address

bytes, a single dummy byte must also be clocked into the device.

After the three address bytes and the dummy byte have been clocked in, additional clock cycles will result in data

being output on both the SO and SIO pins. The data is always output with the MSB of a byte first, and the MSB is

always output on the SO pin. During the first clock cycle, bit seven of the first data byte will be output on the SO pin

while bit six of the same data byte will be output on the SIO pin. During the next clock cycle, bits five and four of the

first data byte will be output on the SO and SIO pins, respectively. The sequence continues with each byte of data

being output after every four clock cycles. When the last byte (0FFFFFh) of the memory array has been read, the

device will continue reading back at the beginning of the array (000000h). No delays will be incurred when wrap-

ping around from the end of the array to the beginning of the array.

Deasserting the CS pin will terminate the read operation and put the SO and SIO pins into a high-impedance state.

The CS pin can be deasserted at any time and does not require that a full byte of data be read.

Figure 7-4.

Dual-Output Read Array

SCK

SIO

MSB

00111011

410 11

812

42 43

37 38

31 32

29 30

47 48

OPCODE

AAAA

A AA

MSB

XXXXXXXX

MSB

ADDRESS BITS A23-A0

DON'T CARE

OUTPUT

DATA BYTE 1

OUTPUT

DATA BYTE 2

HIGH-IMPEDANCE

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