25X32BVFIG Просмотр технического описания (PDF) - Winbond

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25X32BVFIG

32M-BIT SERIAL FLASH MEMORY WITH 4KB SECTORS AND DUAL OUTPUT SPI

Winbond 

W25X32BV

10.2.9 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, DO and DIO, instead of just DO. This allows data to be

transferred from the W25X32BV 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 FR (see AC Electrical Characteristics). This is accomplished by adding eight

“dummy” clocks after the 24-bit address as shown in figure 10. 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 DIO pin should be high-impedance prior to the falling edge of the

first data out clock.

Figure 10. Fast Read Dual Output Instruction Sequence Diagram

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