ACE25QC160GLDPTH datasheet(62/73 Pages) ACE

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ACE25QC160G

16M BIT SPI NOR FLASH

VER 1.2

Enter QPI Mode (38H)

The ACE25QC160G support both Standard/Dual/Quad Serial Peripheral Interface (SPI) and Quad

Peripheral Interface (QPI). However, SPI mode and QPI mode cannot be used at the same time. “Enter

QPI (38h)” instruction is the only way to switch the device from SPI mode to QPI mode.

Upon power-up, the default state of the device upon is Standard/Dual/Quad SPI mode. This provides full

backward compatibility with earlier generations of ACE serial flash memories. See Instruction Set Table 1-

2 for all supported SPI commands. In order to switch the device to QPI mode, the Quad Enable (QE) bit in

Status Register-2 must be set to 1 first, and an “Enter QPI (38h)” instruction must be issued. If the Quad

Enable (QE) bit is 0, the “Enter QPI (38h)” instruction will be ignored and the device will remain in SPI

mode.

See Instruction Set Table 3 for all the commands supported in QPI mode.

When the device is switched from SPI mode to QPI mode, the existing Write Enable and Erase Suspend

status, and the Wrap Length setting will remain unchanged.

Exit QPI Mode (FFH)

In order to exit the QPI mode and return to the Standard/Dual/Quad SPI mode, an “Exit QPI (FFh)”

instruction must be issued.

When the device is switched from QPI mode to SPI mode, the existing Write Enable Latch (WEL) and

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

Figure43. Exit QPI Instruction (QPI Mode only)

Figure42. Enter QPI Instruction (SPI Mode only)

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