ACE25AA800GFMTH datasheet(28/50 Pages) ACE

28 / 50 page

ACE25AA800G

Serial NOR Flash Memory 3.0V Multi I/O with 4KB,32KB & 64KB Sector/Block Erase

VER 1.1

Read Manufacture ID/ Device ID (REMS) (90H)

The Read Manufacturer/Device ID command is an alternative to the Release from Power-Down / Device

ID command that provides both the JEDEC assigned Manufacturer ID and the specific Device ID. The

command is initiated by driving the CS# pin low and shifting the command code “90H” followed by a 24-bit

address (A23-A0) of 000000H. After which, the Manufacturer ID and the Device ID are shifted out on the

falling edge of SCLK with most significant bit (MSB) first is shown in Figure 26. If the 24-bit address is

initially set to 000001H, the Device ID will be read first.

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.

Because the ACE25AA800G has no hardware reset pin, so if Continuous Read Mode bits are set to

“AXH”, the ACE25AA800G will not recognize any standard SPI commands. So Continuous Read Mode

Reset command will release the Continuous Read Mode from the “AXH” state and allow standard SPI

command to be recognized. The command sequence is shown in Figure 27.

Figure26. Read ID Sequence Diagram

Figure27. Continuous Read Mode Reset Sequence Diagram

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