512 Kbit SPI Serial Flash
A Microchip Technology Company
SST25VF512A
Data Sheet
High-Speed-Read (33 MHz)
The High-Speed-Read instruction supporting up to 33 MHz is initiated by executing an 8-bit command,
0BH, followed by address bits [A 23 -A 0 ] and a dummy byte. CE# must remain active low for the duration
of the High-Speed-Read cycle. See Figure 6 for the High-Speed-Read sequence.
Following a dummy byte (8 clocks input 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 auto-
matically increment until the highest memory address is reached. Once the highest memory address is
reached, the address pointer will automatically increment to the beginning (wrap-around) of the
address space, i.e. for 4 Mbit density, once the data from address location 07FFFFH has been read,
the next output will be from address location 000000H.
CE#
MODE 3
0 1 2 3 4 5 6 7 8
15 16
23 24
31 32
39 40
47 48
55 56
63 64
71 72
80
SCK
MODE 0
SI
0B
ADD.
ADD.
ADD.
X
MSB
MSB
SO
HIGH IMPEDANCE
N
D OUT
N+1
D OUT
N+2
D OUT
N+3
D OUT
N+4
D OUT
MSB
Note: X = Dummy Byte: 8 Clocks Input Dummy Cycle (V IL or V IH )
Figure 6: High-Speed-Read Sequence
1264 F05.0
?2011 Silicon Storage Technology, Inc.
11
DS25090A
10/11
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