AT25SL321 datasheet(50/82 Pages) DIALOG

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AT25SL321

DS-25SL321–112H–2020-10

8.29 Enable QPI (38h)

The AT25SL321 support both Standard/Dual/Quad Serial Peripheral interface (SPI) and Quad Peripheral

Interface (QPI). However, SPI mode and QPI mode cannot be used at the same time. Enable QPI instruction is the

only way to switch the device from SPI mode to QPI mode.

In order to switch the device to QPI mode, the Quad Enable (QE) bit in Status Register 2 must be set to 1 first, and

an Enable QPI instruction must be issued. If the Quad Enable (QE) bit is 0, the Enable QPI instruction is ignored

and the device remains in SPI mode.

After power-up, the default state of the device is SPI mode. See the Instruction Set Table 8-2 for all the commands

supported in SPI mode and the Instruction Set Table 8-5 for all the instructions supported in QPI mode.

When the device is switched from SPI mode to QPI mode, the existing Write Enable and Program/Erase Suspend

status, and the Wrap Length setting remains unchanged.

Figure 8-48. Enable QPI Instruction (SPI Mode only)

8.30 Disable QPI (FFh)

By issuing Disable QPI (FFh) instruction, the device switches back to SPI mode. When the device is switched from

QPI mode to SPI mode, the existing Write Enable Latch (WEL) and Program/Erase Suspend status, and the Wrap

Length setting remain unchanged.

Figure 8-49. Disable QPI Instruction for QPI Mode

AT25SL321 Datasheet(PDF) 50 Page - Dialog Semiconductor