6. Pin Descriptions
Serial Clock (CLK): The SPI Serial Clock Input (CLK) pin provides the timing for serial input and
output operations.
Serial Data Input, Output and I/Os (DI, DO and DQ0, DQ1, DQ2, DQ3): The FM25W01 supports
standard SPI, Dual SPI, Quad SPI and QPI operation. Standard SPI instructions use the
unidirectional DI (input) pin to serially write instructions, addresses or data to the device on the
rising edge of the Serial Clock (CLK) input pin. Standard SPI also uses the unidirectional DO
(output) to read data or status from the device on the falling edge of CLK.
Dual/Quad SPI and QPI instructions use the bidirectional DQ pins to serially write instructions,
addresses or data to the device on the rising edge of CLK and read data or status from the
device on the falling edge of CLK. Quad SPI and QPI instructions require the non-volatile Quad
Enable bit (QE) in Status Register-2 to be set. When QE=1, the WP# pin becomes DQ2 and
HOLD# pin becomes DQ3.
Chip Select (CS#): The SPI Chip Select (CS#) pin enables and disables device operation.
When CS# is high, the device is deselected and the Serial Data Output (DO, or DQ0, DQ1, DQ2,
DQ3) pins are at high impedance. When deselected, the devices power consumption will be at
standby levels unless an internal erase, program or write status register cycle is in progress.
When CS# is brought low, the device will be selected, power consumption will increase to active
levels and instructions can be written to and data read from the device. After power-up, CS#
must transition from high to low before a new instruction will be accepted. The CS# input must
track the VCC supply level at power-up (see “9Write Protection” and Figure 62). If needed a pull-
up resister on CS# can be used to accomplish this.
HOLD (HOLD#): The HOLD# pin allows the device to be paused while it is actively selected.
When HOLD# is brought low, while CS# is low, the DO pin will be at high impedance and signals
on the DI and CLK pins will be ignored (don’t care). When HOLD# is brought high, device
operation can resume. The HOLD# function can be useful when multiple devices are sharing the
same SPI signals. The HOLD# pin is active low. When the QE bit of Status Register-2 is set for
Quad I/O, the HOLD# pin function is not available since this pin is used for DQ3.
Write Protect (WP#): The Write Protect (WP#) pin can be used to prevent the Status Registers
from being written. Used in conjunction with the Status Register’s Block Protect (CMP, SEC, TB,
BP2, BP1 and BP0) bits and Status Register Protect (SRP) bits, a portion as small as a 4KB
sector or the entire memory array can be hardware protected. The WP# pin is active low.
However, when the QE bit of Status Register-2 is set for Quad I/O, the WP# pin function is not
available since this pin is used for DQ2.
Datasheet
FM25W01 1M-BIT SERIAL FLASH MEMORY
Ver.0.2
5
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