512Mb, Multiple I/O Serial Flash Memory
Nonvolatile and Volatile Registers
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
register are loaded from the nonvolatile configuration register during each device boot
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 7: Internal Configuration Register
Volatile configuration register
and enhanced volatile
configuration register
Nonvolatile configuration register
Register download is executed after a
WRITE VOLATILE or ENHANCED
VOLATILE CONFIGURATION REGISTER
command, overwriting configuration
register settings on the internal
configuration register.
Register download is executed only
during the power-on phase or after
a reset, overwriting configuration
register settings on the internal
configuration register.
Internal configuration
register
Device behavior
PDF: 09005aef84752721
n25q_512mb_1ce_3V_65nm.pdf - Rev. O 05/13 EN
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