GD25Q64CFJS datasheet(8/74 Pages) GIGADEVICE

8 / 74 page

3.3V Uniform Sector

Dual and Quad Serial Flash

GD25Q64C

DEVICE OPERATION

SPI Mode

Standard SPI

The GD25Q64C 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 GD25Q64C supports Dual SPI operation when using the

“Dual Output Fast Read” (3BH), “Dual I/O Fast Read” (BBH)

and “Read Manufacture ID/ Device ID Dual I/O” (92H) commands. These commands allow data to be transferred to or from

the device at twice 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 GD25Q64C supports Quad SPI operation when using

the “Quad Output Fast Read” (6BH), ”Quad I/O Fast Read”(EBH),

“Quad I/O Word Fast Read” (E7H), “Read Manufacture ID/ Device ID Quad I/O” (94H) and “Quad Page Program” (32H)

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# function is only available when QE=0, If QE=1, The HOLD# functions is disabled, the pin acts as dedicated

data I/O pin.

The HOLD# signal goes low to stop any serial communications with

the device, but doesn’t stop the operation of write status

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.

Figure 1. Hold Condition

HOLD

CS#

SCLK

HOLD#

GD25Q64CFJS Datasheet(PDF) 8 Page - GigaDevice Semiconductor (Beijing) Inc.