AT25SF641B datasheet(14/59 Pages) DIALOG

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AT25SF641B

DS-AT25SF641B–191D–12-2020

Read Commands

7.1

Read Array (0Bh and 03h)

The Read Array command can be used to sequentially read a continuous stream of data from the device by

providing the clock pin once the initial starting address is specified. The device incorporates an internal address

counter that automatically increments every clock cycle.

To perform the Read Array operation, the CS pin first must be asserted, and the appropriate opcode (0Bh or 03h)

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. If the 0Bh opcode is used

for the Read Array operation, an additional dummy byte must be clocked into the device after the three address

bytes.

After the three address bytes (and the dummy byte, if using opcode 0Bh) have been clocked in, additional clock

cycles result in data being output on the SO pin. The data is always output with the MSB of a byte first. When the

last byte (7FFFFFh) of the memory array has been read, the device continues reading back at the beginning of the

array (000000h). No delays are incurred when wrapping around from the end of the array to the beginning of the

array.

Deasserting the CS pin terminates the read operation and puts the SO pin into high-impedance state. The CS pin

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

Figure 7-1. Read Array - 03h Opcode

Figure 7-2. Read Array - 0Bh Opcode

SCK

MSB

00000011

410 11

812

37 38

31 32

29 30

39 40

OPCODE

AAAA

AAA

MSB

DDDDDDDD

ADDRESS BITS A23-A0

DATA BYTE 1

HIGH-IMPEDANCE

SCK

MSB

00001011

410 11

812

42 43

37 38

31 32

29 30

47 48

OPCODE

AAAA

AAA

MSB

XXXXXXXX

MSB

DDDDDDDD

ADDRESS BITS A23-A0

DON'T CARE

DATA BYTE 1

HIGH-IMPEDANCE

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