GD25LQ64CSFS datasheet(51/77 Pages) GIGADEVICE

51 / 77 page

1.8V Uniform Sector

Dual and Quad Serial Flash

GD25LQ64C

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

7.36 Enable Reset (66H) and Reset (99H)

If the Reset command is accepted, any on-going internal operation will be terminated and the device will return to its

default power-on state and lose all the current volatile settings, such as Volatile Status Register bits, Write Enable Latch

status (WEL), Program/Erase Suspend status, Read Parameter setting (P7-P0), Continuous Read Mode bit setting

(M7-M0) and Wrap Bit Setting (W6-W4).

The “Enable Reset (66H)” and the “Reset (99H)” commands can be issued in either SPI or QPI mode. The “Reset

(99H)

” command sequence as follow: CS# goes low  Sending Enable Reset command  CS# goes high  CS# goes

low  Sending Reset command  CS# goes high. Once the Reset command is accepted by the device, the device will

take approximately tRST / tRST_E to reset. During this period, no command will be accepted. Data corruption may happen if

there is an on-going or suspended internal Erase or Program operation when Reset command sequence is accepted by

the device. It is recommended to check the BUSY bit and the SUS bit in Status Register before issuing the Reset command

sequence.

Figure38. Enable Reset and Reset command Sequence Diagram

Command

66H

CS#

SCLK

High-Z

Command

99H

GD25LQ64CSFS Datasheet(PDF) 51 Page - GigaDevice Semiconductor (Beijing) Inc.