S25FL204K0TMFI040 Spansion, S25FL204K0TMFI040 Datasheet - Page 19

• Manufacturer Part Number: S25FL204K0TMFI040
• Description: Flash 4Mb 3V 85MHz Serial NOR Flash
• Manufacturer: Spansion

Specifications of S25FL204K0TMFI040

• Rohs: yes
• Memory Type: NOR Flash
• Memory Size: 4 MB
• Interface Type: SPI
• Access Time: 5 ns
• Supply Voltage - Max: 3.6 V
• Supply Voltage - Min: 2.7 V
• Operating Temperature: - 40 C to + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SO-8

8.7
January 17, 2013 S25FL204K_00_06
Fast Read Dual Output (3Bh)
The Fast Read Dual Output (3Bh) command is similar to the standard Fast Read (0Bh) command except that
data is output on two pins, SO and SI/IO0, instead of just SO. This allows data to be transferred from the
S25FL204K at twice the rate of standard SPI devices. The Fast Read Dual Output command is ideal for
quickly downloading code from the SPI flash to RAM upon power-up or for applications that cache code-
segments to RAM for execution.
Similar to the Fast Read command, the Fast Read Dual Output command can operate at higher frequencies
than the traditional Read Data command.
adding eight “dummy” clocks after the 24-bit address as shown in
device's internal circuits additional time for setting up the initial address. The input data during the dummy
clocks is “don’t care”. However, the SI/IO0 pin should be high-impedance prior to the falling edge of the first
data out clock.
SI/IO0
SI/IO0
SCK
SCK
CS#
CS#
*=M SB
SO
SO
M o d e3
M o d e0
D a t a
7
32 33
0
6
1
Instruction (0BH)
S h e e t
5
Dum m y Clocks
34
2
4
35
3
3
36
4
Figure 8.6 Fast Read Command Sequence
High Im pedance
2
37
5
( P r e l i m i n a r y )
1
38
6
0
S25FL204K
39
7
See AC Characteristics on page 31.
23
*
7
*
40
8
22
6
41
9
24-Bit Address
21
5
10
42
Data O ut 1
4
43 44
3
28 29
3
2
45
2
1
30 31
1
46
Figure
0
0
47
7
48
*
8.7. The dummy clocks allow the
6
49
This is accomplished by
5
50
Data O ut 1
4
51
3
51
2
53
1
54
0
55
7
*
19