AT25QL641 datasheet(47/77 Pages) DIALOG

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AT25QL641

DS-25QL641–130E–10/2018

7.29

Enable QPI (38h)

The AT25QL641 supports both the Standard/Dual/Quad Serial Peripheral interface (SPI) and the Quad Peripheral

Interface (QPI) modes. 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 7-2 for all the commands

supported in SPI mode and the instruction Set Table 7-5 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 7-48. Enable QPI Instruction (SPI Mode only)

7.30

Disable QPI (FFh)

By issuing Disable QPI (FFh) instruction, the device is reset 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

remains unchanged.

Figure 7-49. Disable QPI Instruction for QPI Mode

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