AT25DF321A-MH-T datasheet(10/58 Pages) ATMEL

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3686C–DFLASH–12/08

AT25DF321A [Preliminary]

Figure 7-2.

Read Array – 0Bh Opcode

Figure 7-3.

Read Array – 03h Opcode

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 f

RDDO. 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

7 of the first data byte will be output on the SO pin while bit 6 of the same data byte will be output

on the SIO pin. During the next clock cycle, bits 5 and 4 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 (3FFFFFh) of the memory array has been read,

SCK

MSB

00001011

410 11

812

42 43

37 38

31 32

29 30

47 48

OPCODE

AAAA

AAA

MSB

XXXXXXX

MSB

DDDDDDD

ADDRESS BITS A23-A0

DON'T CARE

DATA BYTE 1

HIGH-IMPEDANCE

SCK

MSB

00000011

410 11

812

37 38

31 32

29 30

39 40

OPCODE

AAAA

AAA

MSB

DDDDDDD

ADDRESS BITS A23-A0

DATA BYTE 1

HIGH-IMPEDANCE

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