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SST25WF020A 데이터시트(PDF) 10 Page - Microchip Technology

부품명 SST25WF020A
상세설명  2 Mbit 1.8V SPI Serial Flash
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제조업체  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

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SST25WF020A
DS20005139E-page 10
 2014 Microchip Technology Inc.
5.1
Read (25 MHz)
The Read instruction, 03H, supports up to 25 MHz
Read. The device outputs a data stream starting from
the specified address location. The data stream is con-
tinuous through all addresses until terminated by a low-
to-high transition on CE#. The internal address pointer
automatically increments until the highest memory
address is reached. Once the highest memory address
is reached, the address pointer automatically incre-
ments to the beginning (wrap-around) of the address
space. For example, for 2 Mbit density, once the data
from the address location 3FFFFH is read, the next out-
put is from address location 000000H. The Read
instruction is initiated by executing an 8-bit command,
03H, followed by address bits A23-A0. CE# must
remain active low for the duration of the Read cycle.
See Figure 5-1 for the Read sequence.
FIGURE 5-1:
READ SEQUENCE
5.2
High-Speed-Read (40 MHz)
The High-Speed-Read instruction supporting up to 40
MHz Read is initiated by executing an 8-bit command,
0BH, followed by address bits [A23-A0] and a dummy
byte. CE# must remain active low for the duration of the
High-Speed-Read cycle. See Figure 5-2 for the High-
Speed-Read sequence.
Following a dummy cycle, the High-Speed-Read
instruction outputs the data starting from the specified
address location. The data output stream is continuous
through all addresses until terminated by a low-to-high
transition on CE#. The internal address pointer will
automatically increment until the highest memory
address is reached. Once the highest memory address
is reached, the address pointer will automatically incre-
ment to the beginning (wrap-around) of the address
space. For example, for 2 Mbit density, once the data
from address location 3FFFFH is read, the next output
will be from address location 000000H.
FIGURE 5-2:
HIGH-SPEED-READ SEQUENCE
2513 F06.0
CE#
SO
SI
SCK
ADD.
01 2 3 4 5 6 7 8
ADD.
ADD.
03
HIGH IMPEDANCE
15 16
23 24
31 32
3 40
70
47
48
55 56
63 64
N+2
N+3
N+4
N
N+1
DOUT
MSB
MSB
MSB
MODE 0
MODE 3
DOUT
DOUT
DOUT
DOUT
2513 F07.0
CE#
SO
SI
SCK
ADD.
012 34 5
6 7 8
ADD.
ADD.
0B
HIGH IMPEDANCE
15 16
23 24
31 32
3 40
47 48
55 56
63 64
N+2
N+3
N+4
N
N+1
MSB
MODE 0
MODE 3
DOUT
DOUT
DOUT
DOUT
80
71 72
DOUT
MSB


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