GD25LQ256CXIGX Datasheet, PDF (55/68 Pages) ELM Electronics – 1.8V Uniform Sector Dual and Quad Serial Flash

GD25LQ256CWIGx 1.8V Uniform Sector Dual and Quad Serial Flash
7.37. Enable QPI (38H)
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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.
Figure 39. Enable QPI mode command Sequence Diagram
CS#
SCLK
01234567
Command
SI
38H
7.38. 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.
Figure 40. Disable QPI mode command Sequence Diagram
CS#
SCLK
IO₀
IO₁
IO₂
IO₃
01
Command
FFH
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Rev.1.0