ACE25AA640GFMTH datasheet(45/65 Pages) ACE

45 / 65 page

ACE25AA640G

Serial NOR Flash Memory

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

VER 1.1

Burst Read with Wrap (0CH)

The “Burst Read with Wrap (0CH)” command provides an alternative way to perform the read operation

with “Wrap Around” in QPI mode. This command is similar to the “Fast Read (0BH)” command in QPI

mode, except the addressing of the read operation will “Wrap Around” to the beginning boundary of the

“Wrap Around” once the ending boundary is reached. The “Wrap Length” and the number of dummy

clocks can be configured by the “Set Read Parameters (C0H)” command. When the dummy cycle is

configured to 4, addr[0] input must be 0.

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.

Figure30. Burst Read with Wrap Command Sequence Diagram

Figure31. Enable QPI Mode Command Sequence Diagram

ACE25AA640GFMTH Datasheet(PDF) 45 Page - ACE Technology Co., LTD.