Datasheet

Nonvolatile and Volatile Registers

The device features the following volatile and nonvolatile registers that users can access

to store device parameters and operating configurations:

• Status register

• Nonvolatile and volatile configuration registers

• Extended address register

• Enhanced volatile configuration register

• Flag status register

• Lock register

Note: The lock register is defined in READ LOCK REGISTER Command.

The working condition of memory is set by an internal configuration register that is not

directly accessible to users. As shown below, parameters in the internal configuration

phase or power-on reset. In this sense, then, the nonvolatile configuration register con-

tains the default settings of memory.

Also, during the life of an application, each time a WRITE VOLATILE or ENHANCED

VOLATILE CONFIGURATION REGISTER command executes to set configuration pa-

rameters in these respective registers, these new settings are copied to the internal con-

figuration register. Therefore, memory settings can be changed in real time. However, at

the next power-on reset, the memory boots according to the memory settings defined

in the nonvolatile configuration register parameters.

Figure 8: Internal Configuration Register

the power-on phase or after a reset,

overwriting configuration register settings

on the internal configuration register.

WRITE VOLATILE OR ENHANCED VOLATILE

CONFIGURATION REGISTER command,

overwriting configuration register

settings on the internal configuration register.

Nonvolatile configuration register

Internal configuration

Device behavior

Volatile configuration register and

enhanced volatile configuration register

3V, 256Mb: Multiple I/O Serial Flash Memory

Nonvolatile and Volatile Registers

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n25q_256mb_65nm.pdf - Rev. W 11/16 EN

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