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W25Q40BW
8.2.12
Fast Read Dual Output (3Bh)
The Fast Read Dual Output (3Bh) instruction is similar to the standard Fast Read (0Bh) instruction except
that data is output on two pins; IO 0 and IO 1 . This allows data to be transferred from the W25Q40BW at
twice the rate of standard SPI devices. The Fast Read Dual Output instruction is ideal for quickly
downloading code from Flash to RAM upon power-up or for applications that cache code-segments to
RAM for execution.
Similar to the Fast Read instruction, the Fast Read Dual Output instruction can operate at the highest
possible frequency of F R (see AC Electrical Characteristics). This is accomplished by adding eight
“dummy” clocks after the 24 -bit address as shown in figure 11. 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 IO 0 pin should be high-impedance prior to the falling edge of the first data
out clock.
Figure 11. Fast Read Dual Output Instruction Sequence Diagram
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