S25FL208K View Datasheet(PDF) - Spansion Inc.
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S25FL208K Datasheet PDF : 37 Pages
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Data Sheet (Preliminary)
Figure 8.6 Fast Read Command Sequence
C S#
Mode3 0 1 2 3 4 5 6 7 8 9 10
SC K M o d e0
28 29 30 31
In s tr u c tio n (0B H)
24-Bit Address
SI/IO0
SO
23 22 21
*
High Im pedance
321 0
C S#
SC K
SI/IO0
SO
*=M SB
32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 51 53 54 55
Dum m y Clocks
7 6 5 4 32 10
Data O ut1
Data O ut1
7 6 5 4 3 2 1 0 7 6 54 3 2 1 07
*
*
*
8.7
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
S25FL208K 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. See AC Characteristics on page 31. This is accomplished by
adding eight “dummy” clocks after the 24-bit address as shown in Figure 8.7. The dummy clocks allow the
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.
August 14, 2012 S25FL208K_00_05
S25FL208K
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