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GD25B127DFES 数据表(PDF) 19 Page - GigaDevice Semiconductor (Beijing) Inc. |
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GD25B127DFES 数据表(HTML) 19 Page - GigaDevice Semiconductor (Beijing) Inc. |
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19 / 65 page ![]() 3.3V Uniform Sector Dual and Quad Serial Flash GD25B127D 19 7.7. Read Data Bytes at Higher Speed (Fast Read) (0BH) The Read Data Bytes at Higher Speed (Fast Read) command is for quickly reading data out. It is followed by a 3-byte address (A23-A0) and a dummy byte, and each bit is latched-in on the rising edge of SCLK. Then the memory content, at that address, is shifted out on SO, and each bit is shifted out, at a Max frequency fC, on the falling edge of SCLK. 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. Figure9. Read Data Bytes at Higher Speed Sequence Diagram 7.8. Dual Output Fast Read (3BH) The Dual Output Fast Read command is followed by 3-byte address (A23-A0) and a dummy byte, 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 Figure 10. 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. Dual Output Fast Read Sequence Diagram Command 0 1 2 3 4 5 6 7 0BH CS# SCLK SI SO High-Z 8 9 10 28 29 30 31 3 2 1 0 23 22 21 24-bit address MSB 34 35 36 37 33 6 5 4 3 2 1 0 38 39 Data Out1 32 42 43 44 45 41 46 47 40 7 6 5 4 3 2 1 0 7 6 5 7 Data Out2 CS# SCLK SI SO MSB Dummy Byte Command 0 1 2 3 4 5 6 7 3BH CS# SCLK SI SO High-Z 8 9 10 28 29 30 31 3 2 1 0 23 22 21 24-bit address MSB 34 35 36 37 33 5 3 1 7 5 3 1 38 39 Data Out1 32 42 43 44 45 41 46 47 40 7 Data Out2 CS# SCLK SI SO MSB Dummy Clocks 4 2 0 6 4 2 0 6 6 7 |
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