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GD25Q128CXIGX Datasheet(PDF) 26 Page - ELM Electronics |
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GD25Q128CXIGX Datasheet(HTML) 26 Page - ELM Electronics |
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26 / 69 page  26 Rev.1.2 69 - http://www.elm-tech.com GD25Q128CxIGx 3.3V Uniform Sector Dual and Quad Serial Flash Figure 13. Quad I/O Fast Read Sequence Diagram (M5-4 ≠ (1, 0)) Command 0 1 2 3 4 5 6 7 EBH 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 Figure 13a. Quad I/O 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 7.11. Quad I/O Fast Read (EBH) The Quad I/O Fast Read command is similar to the Dual I/O Fast Read command but with the capability to input the 3-byte address (A23-0) and a “Continuous Read Mode” byte and 4-dummy clock 4-bit per clock by IO0, IO1, IO2, IO3, each bit being latched in during the rising edge of SCLK, then the memory contents are shifted out 4-bit per clock cycle from IO0, IO1, IO2, IO3. 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 Fast read command. Quad I/O Fast Read with “Continuous Read Mode” The Quad I/O 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 Fast Read command (after CS# is raised and then lowered) does not require the EBH command code. The command sequence is shown in followed Figure13a. If the “Continuous Read Mode” bits (M5-4) do not equal to (1, 0), the next command requires the first EBH command code, thus returning to normal operation. A “Continuous Read Mode” Reset command can be used to reset (M5-4) before issuing normal command. |
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