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GD25Q128CXIGX Datasheet(PDF) 23 Page - ELM Electronics |
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GD25Q128CXIGX Datasheet(HTML) 23 Page - ELM Electronics |
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23 / 69 page ![]() 23 Rev.1.2 69 - http://www.elm-tech.com GD25Q128CxIGx 3.3V Uniform Sector Dual and Quad Serial Flash 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, each bit being latched in during 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 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. Figure 10. Dual Output Fast Read Sequence Diagram Fast Read (0BH) in QPI mode The Fast Read command is also supported in QPI mode. In QPI mode, the number of dummy clocks is configured by the “Set Read Parameters (C0H)” command to accommodate a wide range application with different needs for either maximum Fast Read frequency or minimum data access latency. Depending on the Read Parameter Bits P[5:4] setting, the number of dummy clocks can be configured as either 4/6/8/8. Figure 9a. Read Data Bytes at Higher Speed Sequence Diagram (QPI) CS# SCLK IO0 IO1 IO2 IO3 0 1 2 3 4 5 Command 0BH 20 12 16 8 6 7 8 9 10 4 4 0 0 4 0 4 0 4 21 13 17 9 5 5 1 1 5 1 5 1 5 22 14 18 10 6 6 2 2 6 2 6 2 6 23 15 19 11 7 7 3 3 7 3 7 3 7 A23-16 A15-8 A7-0 Dummy* 11 12 13 IOs switch from Input to output Byte1 Byte2 *"Set Read Parameters" Command (C0H) can set the number of dummy clocks |
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