ACE25AA320GFMTH datasheet(45/67 Pages) ACE

45 / 67 page

ACE25AA320G

Serial NOR Flash Memory

3.0V Multi I/O with 4KB, 32KB & 64KB Sector/Block Erase

VER 1.2

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.

Continuous Read Mode Reset (CRMR) (FFH)/ Disable QPI (FFH)/ Continuous Read Mode

Reset (CRMR) (FFH)

The Dual/Quad I/O Fast Read operations, “Continuous Read Mode” bits (M7-0) are implemented to

further reduce command overhead. By setting the (M7-0) to AXH, the next Dual/Quad I/O Fast Read

operations do not require the BBH/EBH/E7H command code.

Figure30. Burst Read with Wrap Command Sequence Diagram

Figure31. Enable QPI Mode Command Sequence Diagram

ACE25AA320GFMTH Datasheet(PDF) 45 Page - ACE Technology Co., LTD.