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GD25Q128CXIGX Datasheet(PDF) 27 Page - ELM Electronics |
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GD25Q128CXIGX Datasheet(HTML) 27 Page - ELM Electronics |
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27 / 69 page  27 Rev.1.2 69 - http://www.elm-tech.com GD25Q128CxIGx 3.3V Uniform Sector Dual and Quad Serial Flash Quad I/O Fast Read with “8/16/32/64-Byte Wrap Around” in Standard SPI mode The Quad I/O Fast Read command can be used to access a specific portion within a page by issuing “Set Burst with Wrap” (77H) commands prior to EBH. The “Set Burst with Wrap” (77H) command can either enable or disable the “Wrap Around” feature for the following EBH commands. When “Wrap Around” is enabled, the data being accessed can be limited to either an 8/16/32/64-byte section of a 256-byte page. The output data starts at the initial address specified in the command, once it reaches the ending boundary of the 8/16/32/64-byte section, the output will wrap around the beginning boundary automatically until CS# is pulled high to terminate the command. The Burst with Wrap feature allows applications that use cache to quickly fetch a critical address and then fill the cache afterwards within a fixed length (8/16/32/64-byte) of data without issuing multiple read commands. The “Set Burst with Wrap” command allows three “Wrap Bits” W6-W4 to be set. The W4 bit is used to enable or disable the “Wrap Around” operation while W6-W5 is used to specify the length of the wrap around section within a page. Quad I/O Fast Read (EBH) in QPI mode The Quad I/O Fast Read command is also supported in QPI mode. See Figure13b. 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. In QPI mode, the “Continuous Read Mode” bits M7-M0 are also considered as dummy clocks. “Continuous Read Mode” feature is also available in QPI mode for Quad I/O Fast Read command. “Wrap Around” feature is not available in QPI mode for Quad I/O Fast Read command. To perform a read operation with fixed data length wrap around in QPI mode, a dedicated “Burst Read with Wrap” (0CH) command must be used. Figure 13b. Quad I/O Fast Read Sequence Diagram (M5-4 = (1, 0) QPI) CS# SCLK IO0 IO1 IO2 IO3 0 1 2 3 4 5 Command EBH 20 12 16 8 6 7 8 9 10 4 4 0 4 0 4 0 4 21 13 17 9 5 5 1 5 1 5 1 5 22 14 18 10 6 6 2 6 2 6 2 6 23 15 19 11 7 7 3 7 3 7 3 7 A23-16 A15-8 A7-0 M7-4* 11 12 13 14 IOs switch from Input to output Byte1 Byte2 Byte3 *"Set Read Parameters" Command (C0H) can set the number of dummy clocks Dummy |
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