AT25SL641 datasheet(47/76 Pages) DIALOG

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AT25SL641

DS-25SL641–113F–12/2018

7.29

Enable QPI (38h)

The AT25SL641 supports both the 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. The Enable QPI instruction is used

to switch the device from SPI mode to QPI mode.

To switch the device to QPI mode, the Quad Enable (QE) bit in Status Register 2 must be set, followed by an Enable QPI

instruction. 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 7-47. Enable QPI Instruction (SPI Mode only)

7.30

Disable QPI (FFh)

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

settings remains unchanged.

Figure 7-48. Disable QPI Instruction for QPI Mode

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