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GD25LB32D Scheda tecnica(PDF) 27 Page - GigaDevice Semiconductor (Beijing) Inc. |
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GD25LB32D Scheda tecnica(HTML) 27 Page - GigaDevice Semiconductor (Beijing) Inc. |
27 / 67 page 1.8V Uniform Sector Dual and Quad Serial Flash GD25LB32D 27 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 Figure12b. 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. 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. Figure12b. 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 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 M7-0* 11 12 13 14 IOs switch from Input to output dummy* Byte1 Byte2 *"Set Read Parameters" Command (C0H) can set the number of dummy clocks |
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