Datasheet
©2011 Silicon Storage Technology, Inc. DS25071A 12/11
11
32 Mbit SPI Serial Flash
SST25VF032B
Data Sheet
A
Microchip Technology Company
High-Speed-Read (80 MHz)
The High-Speed-Read instruction supporting up to 80 MHz Read is initiated by executing an 8-bit com-
mand, 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 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
increment to the beginning (wrap-around) of the address space. For example, once the data from address
location 3FFFFFH has been read, the next output will be from address location 000000H.
Figure 6: High-Speed-Read Sequence
Byte-Program
The Byte-Program instruction programs the bits in the selected byte to the desired data. The selected
byte must be in the erased state (FFH) when initiating a Program operation. A Byte-Program instruction
applied to a protected memory area will be ignored.
Prior to any Write operation, the Write-Enable (WREN) instruction must be executed. CE# must remain
active low for the duration of the Byte-Program instruction. The Byte-Program instruction is initiated by
executing an 8-bit command, 02H, followed by address bits [A
23
-A
0
]. Following the address, the data is
input in order from MSB (bit 7) to LSB (bit 0). CE# must be driven high before the instruction is exe-
cuted. The user may poll the Busy bit in the software status register or wait T
BP
for the completion of
the internal self-timed Byte-Program operation. See Figure 7 for the Byte-Program sequence.
Figure 7: Byte-Program Sequence
1327 F07.1
CE#
SO
SI
SCK
ADD.
012345678
ADD. ADD.0B
HIGH IMPEDANCE
15 16 23 24 31 32 39 40
47 48 55 56 63 64
N+2 N+3 N+4
N
N+1
X
MSB
MODE 0
MODE 3
D
OUT
D
OUT
D
OUT
D
OUT
78
71 72
D
OUT
1327 F08.0
CE#
SO
SI
SCK
ADD.
012345678
ADD.
ADD.
D
IN
02
HIGH IMPEDANCE
15 16 23 24 31 32 39
MSB LSB
MODE 3
MODE 0