AT25SF641 datasheet(47/76 Pages) DIALOG

tên linh kiện	AT25SF641

Giải thích chi tiết về linh kiện	64-Mbit, 2.7V Minimum SPI Serial Flash Memory with Dual I/O, Quad I/O and QPI Support

PDF	76 Pages

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AT25SF641

DS-25SF641–111E–3/2018

7.28

Enable QPI (38h)

The AT25SF641 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. The ‘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 will be ignored and

the device will remain 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 will remain unchanged.

Figure 7-48. Enable QPI instruction (SPI Mode only)

7.29

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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