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W25Q16JVSSIQ Datasheet(PDF) 30 Page - Winbond |
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W25Q16JVSSIQ Datasheet(HTML) 30 Page - Winbond |
30 / 75 page W25Q16JV - 29 - 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. The Quad Enable (QE) bit in Status Register- 2 must be set to 1 before the device will accept the Fast Read Quad Output Instruction. The Fast Read Quad Output Instruction allows data to be transferred 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 20. 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. Figure 20. Fast Read Quad Output Instruction /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 * |
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