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AT25SL321 bảng dữ liệu(PDF) 27 Page - Dialog Semiconductor

tên linh kiện AT25SL321
Giải thích chi tiết về linh kiện  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 bảng dữ liệu(HTML) 27 Page - Dialog Semiconductor

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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)



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