AT25QL321 datasheet(6/79 Pages) DIALOG

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AT25QL321

DS-25QL321–131C–5/2017

WP (I/O2)

WRITE PROTECT

The Write Protect (WP) pin can be used to protect the Status Register against data

modification. The WP pin is active low. When the QE bit of Status Register-2 is set for Quad

I/O, the WP pin (Hardware Write Protect) function is not available since this pin is used for IO2.

See figures 1-1, 1-2, and 1-3 for the pin configuration of Quad I/O and QPI operation.

Input/Output

ACC

ACCELERATED PROGRAMMING

The device offers accelerated program operations through the ACC function. This

function is primarily intended to allow faster manufacturing throughput at the factory.

If the system asserts VHH on this pin, the device uses the higher voltage on the pin to

reduce the time required for program operations. Removing VHH from the ACC pin

returns the device to normal operation.

Note that the ACC pin must not be at VHH for operations other than accelerated

programming, or device damage may result. In addition, the ACC pin must not be left

floating or unconnected; inconsistent behavior of the device may result. The ACC

function is only available during standard SPI Mode.

HOLD

(I/O3)

HOLD

The HOLD pin is used to pause a serial sequence of the SPI flash memory without

resetting the clocking sequence. To enable the HOLD mode, the CS must be in low state.

The HOLD mode effects on with the falling edge of the HOLD signal with CLK being low.

The HOLD mode ends on the rising edge of HOLD signal with SCK being low.

In other words, HOLD mode can't be entered unless SCK is low at the falling edge of the

HOLD signal. And HOLD mode can't be exited unless SCK is low at the rising edge of the

HOLD signal.

If CS is driven high during a HOLD condition, it resets the internal logic of the device. As

long as HOLD signal is low, the memory remains in the HOLD condition. To re-work

communication with the device, HOLD must go high, and CS must go low. See Figure

8.11 for HOLD timing.

Input/Output

VCC

DEVICE POWER SUPPLY: VCC is the supply voltage. It is the single voltage used for all

device functions including read, program, and erase. The VCC pin is used to supply the

source voltage to the device. Operations at invalid VCC voltages may produce spurious results

and should not be attempted.

Power

GND

GROUND:

VSS is the reference for the VCC supply voltage. The ground reference for the

power supply. GND should be connected to the system ground.

Power

Table 1-1.

Pin Descriptions (Continued)

Symbol

Name and Function

Asserted

State

Type

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