AT25SL321 datasheet(27/82 Pages) DIALOG

부품명	AT25SL321

상세설명	32-Mbit, 1.7 V Minimum SPI Serial Flash Memory with Dual I/O, Quad I/O and QPI Support

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AT25SL321

DS-25SL321–112H–2020-10

8.11 Fast Read Dual Output (3Bh)

By using two pins (IO0 and IO1, instead of just IO0), the Fast Read Dual Output instruction allows data to be

transferred from the AT25SL321 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 application that cache code-

segments to the RAM for execution.

The Fast Read Dual Output instruction can operate at the highest possible frequency of FR (see AC Electrical

Characteristics). After the 24-bit address, eight “dummy” clocks are inserted to allow the internal circuits time set up

the initial address. During the dummy clocks, the data value on the SO pin is a “don’t care”. However, the IO0 pin is

going to be high-impedance prior to the falling edge of the first data out clock. This is shown in Figure 8-14.

Figure 8-14. Fast Read Dual Output Instruction (SPI Mode)

AT25SL321 데이터시트(PDF) 27 Page - Dialog Semiconductor