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AT25DF041A-SSH-T Datasheet(PDF) 8 Page - List of Unclassifed Manufacturers

Part # AT25DF041A-SSH-T
Description  Minimum SPI Serial Flash Memory
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3668F–DFLASH–11/2013
AT25DF041A
7.
Read Commands
7.1
Read Array
The Read Array command can be used to sequentially read a continuous stream of data from
the device by simply providing the SCK signal once the initial starting address has been speci-
fied. The device incorporates an internal address counter that automatically increments on every
clock cycle.
Two opcodes, 0Bh and 03h, can be used for the Read Array command. The use of each opcode
depends on the maximum SCK frequency that will be used to read data from the device. The
0Bh opcode can be used at any SCK frequency up to the maximum specified by fSCK. The 03h
opcode can be used for lower frequency read operations up to the maximum specified by fRDLF.
To perform the Read Array operation, the CS pin must first 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, then one don't care byte must also be
clocked in after the three address bytes.
After the three address bytes (and the one don't care byte if using opcode 0Bh) have been
clocked in, additional clock cycles will result in serial data being output on the SO pin. The data
is always output with the MSB of a byte first. When the last byte (07FFFFh) 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 wrapping 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 pin into a high-imped-
ance state. The CS pin can be deasserted at any time and does not require that a full byte
of data be read.
Figure 7-1.
Read Array – 0Bh Opcode
Figure 7-2.
Read Array – 03h Opcode
SCK
CS
SI
SO
MSB
MSB
23
1
0
00001011
67
5
410 11
9
812
39
42 43
41
40
37 38
33
36
35
34
31 32
29 30
44
47 48
46
45
OPCODE
AAAA
AAA
A
A
MSB
XXXXXXX
X
MSB
MSB
DDDDDDD
D
D
D
ADDRESS BITS A23-A0
DON'T CARE
DATA BYTE 1
HIGH-IMPEDANCE
SCK
CS
SI
SO
MSB
MSB
23
1
0
00000011
67
5
410 11
9
812
37 38
33
36
35
34
31 32
29 30
39 40
OPCODE
AAAA
AAA
A
A
MSB
MSB
DDDDDDD
D
D
D
ADDRESS BITS A23-A0
DATA BYTE 1
HIGH-IMPEDANCE


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