GD25LQ128DSFS datasheet(54/79 Pages) GIGADEVICE

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1.8V Uniform Sector

Dual and Quad Serial Flash

GD25LQ128D

7.34. 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 Quad Enable (QE) bit in Status Register-1 must be set to 1 first, and

“Enable QPI (38H)” command must

be issued. If

the QE bit is 0, the “Enable QPI (38H)” command will be ignored and the device will remain in SPI mode. 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.

Figure36. Enable QPI mode command Sequence Diagram

Command

38H

CS#

SCLK

7.35.

Disable QPI (FFH)

To exit the QPI mode and return to Standard/Dual/Quad SPI mode, the

“Disable QPI (FFH)” command must be

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

Suspend status, and the Wrap Length setting will remain unchanged.

Figure37. Disable QPI mode command Sequence Diagram

CS#

SCLK

IO0

IO1

IO2

IO3

Command

FFH

GD25LQ128DSFS 데이터시트(PDF) 54 Page - GigaDevice Semiconductor (Beijing) Inc.