SA25F005 Saifun, SA25F005 Datasheet - Page 23

• Manufacturer Part Number: SA25F005
• Description: 512Kb Serial Flash
• Manufacturer: Saifun

Read Data Bytes (READ)
Reading the memory via the serial SPI link
requires the following sequence:
1. After the CSb line is pulled low to
2. Upon completion, any data on the
3. The data (D7-D0) at the specified
SCK
CS
SO
select
opcode is transmitted via the SI
line, followed by the 3-byte address
to be read (address bits A23 to A18
are Don’t Care).
SI line is ignored.
address is then shifted out onto the
SO line. Each bit is shifted out at a
maximum SCK frequency of F
SI
the
0
device,
1
2
High Impedance
Instruction
Figure 14. Read (READ) Instruction Sequence
3
the
4
5
READ
SCK
6
.
7
23
8
22
9
21
10
Address
24-Bit
28
3
If only one byte is to be read, the CSb line
should be driven high after the data comes
out.
continued,
automatically
continues to shift out. When the highest
address is reached, the address counter
rolls over to the lowest address, enabling
the entire memory to be read in one
continuous READ cycle. The instruction
sequence is shown in Figure 14.
Driving CSb high terminates the READ
instruction, which can be done at any time
during data output. Any READ instruction
executed while an Erase, Program or
WRSR cycle is in progress is rejected
without having any effect on the cycle in
progress.
29
2
30
1
The
31
0
MSB
7
32
6
READ
as
33
5
34
incremented
DATA OUT 1
SA25F005 Advanced Information
the
4
35
3
36
sequence
byte
2
37
www.DataSheet4U.com
1
38
0
39
address
MSB
and
DATA OUT 2
7
can
SAIFUN
data
be
is
23