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GD25LQ128DSJS Datasheet(PDF) 30 Page - GigaDevice Semiconductor (Beijing) Inc. |
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GD25LQ128DSJS Datasheet(HTML) 30 Page - GigaDevice Semiconductor (Beijing) Inc. |
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30 / 79 page ![]() 1.8V Uniform Sector Dual and Quad Serial Flash GD25LQ128D 30 7.12. Quad I/O Word Fast Read (E7H) The Quad I/O Word Fast Read command is similar to the Quad I/O Fast Read command except that the lowest address bit (A0) must equal 0 and only 2-dummy clock. The command sequence is shown in followed Figure13. The first byte addressed can be at any location. The address is automatically incremented to the next higher address after each byte of data is shifted out. The Quad Enable bit (QE) of Status Register (S9) must be set to enable for the Quad I/O Word Fast read command. Quad I/O Word Fast Read with “Continuous Read Mode” The Quad I/O Word Fast Read command can further reduce command overhead through setting the “Continuous Read Mode ” bits (M7-0) after the input 3-byte address (A23-A0). If the “Continuous Read Mode” bits (M5-4) = (1, 0), then the next Quad I/O Word Fast Read command (after CS# is raised and then lowered) does not require the E7H command code. The command sequence is shown in followed Figure13. If the “Continuous Read Mode” bits (M5-4) do not equal to (1, 0), the next command requires the first E7H command code, thus returning to normal operation. A “Continuous Read Mode ” Reset command can be used to reset (M5-4) before issuing normal command. Figure13. Quad I/O Word Fast Read Sequence Diagram (M5-4 ≠ (1, 0)) Command 0 1 2 3 4 5 6 7 E7H CS# SCLK SI(IO0) SO(IO1) 8 9 10 11 12 13 14 15 4 0 4 0 4 0 4 0 16 17 18 19 20 21 22 23 4 0 4 0 5 1 5 1 5 1 5 1 5 1 5 1 A23-16 A15-8 A7-0 M7-0 6 2 6 2 6 2 6 2 6 2 6 2 7 3 7 3 7 3 7 3 7 3 7 3 WP#(IO2) HOLD#(IO3) 4 5 6 7 Dummy Byte1 Byte2 4 0 5 1 6 2 7 3 Byte3 Figure13a. Quad I/O Word Fast Read Sequence Diagram (M5-4= (1, 0)) 0 1 2 3 4 5 6 7 CS# SCLK 8 9 10 11 12 13 14 15 SI(IO0) SO(IO1) WP#(IO2) HOLD#(IO3) 4 0 4 0 5 1 5 1 6 2 6 2 7 3 7 3 4 0 4 0 5 1 5 1 6 2 6 2 7 3 7 3 4 0 4 0 5 1 5 1 6 2 6 2 7 3 7 3 4 5 6 7 A23-16 A15-8 A7-0 M7-0 Dummy Byte1 Byte2 4 0 5 1 6 2 7 3 Byte3 Quad I/O Word Fast Read with “8/16/32/64-Byte Wrap Around” in Standard SPI Mode The Quad I/O Word Fast Read command can be used to access a specific portion within a page by issuing “Set Burst with Wrap ” (77H) commands prior to E7H. The “Set Burst with Wrap” (77H) command can either enable or disable the “Wrap Around ” feature for the following E7H commands. When “Wrap Around” is enabled, the data being accessed can be limited |
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