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GD25LB32D Scheda tecnica(PDF) 51 Page - GigaDevice Semiconductor (Beijing) Inc. |
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GD25LB32D Scheda tecnica(HTML) 51 Page - GigaDevice Semiconductor (Beijing) Inc. |
51 / 67 page 1.8V Uniform Sector Dual and Quad Serial Flash GD25LB32D 51 7.34. Burst Read with Wrap (0CH) The “Burst Read with Wrap (0CH)” command provides an alternative way to perform the read operation with “Wrap Around ” in QPI mode. This command is similar to the “Fast Read (0BH)” command in QPI mode, except the addressing of the read operation will “Wrap Around” to the beginning boundary of the “Wrap Around” once the ending boundary is reached. The “Wrap Length” and the number of dummy clocks can be configured by the “Set Read Parameters (C0H)” command. Figure34. Burst Read with Wrap command Sequence Diagram CS# SCLK IO0 IO1 IO2 IO3 0 1 2 3 4 5 Command 0CH 20 12 16 8 6 7 8 9 10 4 0 4 0 4 0 4 21 13 17 9 5 1 5 1 5 1 5 22 14 18 10 6 2 6 2 6 2 6 23 15 19 11 7 3 7 3 7 3 7 A23-16 A15-8 A7-0 Dummy* 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 7.35. Enable QPI (38H) The device support both Standard/Dual/Quad SPI and QPI mode. The “Enable QPI (38H)” command can switch the device from SPI mode to QPI mode. See the command Table 2a for all support QPI commands. In order to switch the device to QPI mode, the “Enable QPI (38H)” command must be issued. When the device is switched from SPI mode to QPI mode, the existing Write Enable Latch and Program/Erase Suspend status, and the Wrap Length setting will remain unchanged. Figure35. Enable QPI mode command Sequence Diagram Command 0 1 2 3 4 5 6 7 38H CS# SCLK SI |
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