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W25Q80BWSVIP 데이터시트(PDF) 28 Page - Winbond |
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W25Q80BWSVIP 데이터시트(HTML) 28 Page - Winbond |
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28 / 74 page ![]() W25Q80BW - 28 - 7.2.13 Fast Read Quad Output (6Bh) The Fast Read Quad Output (6Bh) instruction is similar to the Fast Read Dual Output (3Bh) instruction except that data is output on four pins, IO0, IO1, IO2, and IO3. A Quad enable of Status Register-2 must be executed before the device will accept the Fast Read Quad Output Instruction (Status Register bit QE must equal 1). The Fast Read Quad Output Instruction allows data to be transferred from the W25Q80BW at four times the rate of standard SPI devices. The Fast Read Quad 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 12. 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 pins should be high-impedance prior to the falling edge of the first data out clock. /CS CLK Mode 0 Mode 3 0 1 2 3 4 5 6 7 Instruction (6Bh) High Impedance 8 9 10 28 29 30 32 33 34 35 36 37 38 39 4 0 24-Bit Address 23 22 21 3 2 1 0 * 31 31 /CS CLK Dummy Clocks 0 40 41 42 43 44 45 46 47 5 1 High Impedance 4 5 Byte 1 High Impedance High Impedance 6 2 7 3 High Impedance 6 7 High Impedance 4 0 5 1 6 2 7 3 4 0 5 1 6 2 7 3 4 0 5 1 6 2 7 3 Byte 2 Byte 3 Byte 4 IO 0 switches from Input to Output IO 0 IO 1 IO 2 IO 3 IO 0 IO 1 IO 2 IO 3 = MSB * Figure 12. Fast Read Quad Output Instruction Sequence Diagram |
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