Datenblatt-Suchmaschine für elektronische Bauteile |
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GD25LB32D Datenblatt(PDF) 24 Page - GigaDevice Semiconductor (Beijing) Inc. |
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GD25LB32D Datenblatt(HTML) 24 Page - GigaDevice Semiconductor (Beijing) Inc. |
24 / 67 page 1.8V Uniform Sector Dual and Quad Serial Flash GD25LB32D 24 7.10. Quad Output Fast Read (6BH) The Quad Output Fast Read command is followed by 3-byte address (A23-A0) and a dummy byte, and each bit is latched in during the rising edge of SCLK, then the memory contents are shifted out 4-bit per clock cycle from IO3, IO2, IO1 and IO0. The command sequence is shown in followed Figure10. 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. Figure10. Quad Output Fast Read Sequence Diagram Command 0 1 2 3 4 5 6 7 6BH CS# SCLK SI(IO0) SO(IO1) High-Z 8 9 10 28 29 30 31 3 2 1 0 23 22 21 24-bit address 34 35 36 37 33 1 5 1 5 1 5 1 38 39 Byte1 32 42 43 44 45 41 46 47 40 5 Dummy Clocks 0 4 0 4 0 4 0 4 4 5 IO2 High-Z IO3 High-Z CS# SCLK SI(IO0) SO(IO1) IO2 IO3 2 6 2 6 2 6 2 6 6 3 7 3 7 3 7 3 7 7 Byte2 Byte3 Byte4 7.11. Dual I/O Fast Read (BBH) The Dual I/O Fast Read command is similar to the Dual Output Fast Read command but with the capability to input the 3-byte address (A23-0) and a “Continuous Read Mode” byte 2-bit per clock by SI and SO, and each bit is latched in on the rising edge of SCLK, then the memory contents are shifted out 2-bit per clock cycle from SI and SO. The command sequence is shown in followed Figure11. 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. Dual I/O Fast Read with “Continuous Read Mode” The Dual 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 Dual I/O Fast Read command (after CS# is raised and then lowered) does not require the BBH command code. The command sequence is shown in followed Figure11. If the “Continuous Read Mode” bits (M5-4) do not equal (1, 0), the next command requires the first BBH 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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