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ACE25C400G 데이터시트(PDF) 5 Page - ACE Technology Co., LTD.

부품명 ACE25C400G
상세설명  Uniform SECTOR Dual and Quad Serial Flash
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제조업체  ACE [ACE Technology Co., LTD.]
홈페이지  http://www.ace-ele.com
Logo ACE - ACE Technology Co., LTD.

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ACE25C400G
Uniform SECTOR Dual and Quad Serial Flash
VER 1.5
5
Device Operation
SPI Mode
Standard SPI
The ACE25C400G features a serial peripheral interface on 4 signals bus: Serial Clock (SCLK), Chip
Select (CS#), Serial Data Input (SI) and Serial Data Output (SO). Both SPI bus mode 0 and 3 are
supported. Input data is latched on the rising edge of SCLK and data shifts out on the falling edge of
SCLK.
Dual SPI
The ACE25C400G supports Dual SPI operation when using the “Dual Output Fast Read” and “Dual
I/O Fast Read” (3BH and BBH) commands. These commands allow data to be transferred to or from
the device at two times the rate of the standard SPI. When using the Dual SPI command the SI and
SO pins become bidirectional I/O pins: IO0 and IO1.
Quad SPI
The ACE25C400G supports Quad SPI operation when using the “Quad Output Fast Read”,” Quad
I/O Fast Read”, “Quad I/O Word Fast Read” (6BH, EBH, E7H) commands. These commands allow
data to be transferred to or from the device at four times the rate of the standard SPI. When using the
Quad SPI command the SI and SO pins become bidirectional I/O pins: IO0 and IO1, and WP# and
HOLD# pins become IO2 and IO3. Quad SPI commands require the non-volatile Quad Enable bit (QE)
in Status Register to be set.
Hold
The HOLD# signal goes low to stop any serial communications with the device, but doesn’t stop the
operation of write status register, programming, or erasing in progress.
The operation of HOLD, need CS# keep low, and starts on falling edge of the HOLD# signal, with
SCLK signal being low (if SCLK is not being low, HOLD operation will not start until SCLK being low).
The HOLD condition ends on rising edge of HOLD# signal with SCLK being low (If SCLK is not being
low, HOLD operation will not end until SCLK being low).
The SO is high impedance, both SI and SCLK don’t care during the HOLD operation, if CS# drives
high during HOLD operation, it will reset the internal logic of the device. To re-start communication
with chip, the HOLD# must be at high and then CS# must be at low.
Figure1. Hold Condition


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