Description
The ACE25Q400G is 4M-bit Serial Peripheral Interface(SPI) Flash memory, and supports the Dual/Quad SPI: Serial Clock, Chip Select, Serial Data I/O0 (SI), I/O1 (SO), I/O2 (/WP), and I/O3 (/HOLD).
The Dual I/O data is transferred with speed of 216Mbits/s and the Quad I/O & Quad output data is transferred with speed of 434Mbits/s. The device uses a single low voltage power supply, ranging from 2.7 Volt to 3.6 Volt.
Additionally, the device supports JEDEC standard manufacturer and device ID and three 256-bytes Security Registers.

FEATUREs
● Serial Peripheral Interface (SPI)
   - Standard SPI: SCLK, /CS, SI, SO, /WP, /HOLD
   - Dual SPI: SCLK, /CS, IO0, IO1, /WP, /HOLD
   - Quad SPI: SCLK, /CS, IO0, IO1, IO2, IO3
● Read
   - Normal Read (Serial): 50MHz clock rate
   - Fast Read (Serial): 108MHz clock rate
   - Dual/Quad (Multi-I/O) Read: 108MHz clock rate
● Program
   - Serial-input Page Program up to 256bytes
   -Program Suspend and Resume
● Erase
   - Block erase (64/32 KB)
   - Sector erase (4 KB)
   - Chip erase
   - Erase Suspend and Resume
● Program/Erase Speed
   - Page Program time: 0.7ms typical
   - Sector Erase time: 60ms typical
   - Block Erase time: 0.3/0.5s typical
   - Chip Erase time: 4s typical
● Flexible Architecture
   -Sector of 4K-byte
   -Block of 32/64K-byte
● Low Power Consumption
   - 20mA maximum active current
   - 5uA maximum power down current