N25Q128A23ESF40F View Datasheet(PDF) - Numonyx -> Micron

Part Name

Description

MFG CO.

N25Q128A23ESF40F

128-Mbit 3 V, multiple I/O, 4-Kbyte subsector erase on boot sectors, XiP enabled, serial flash memory with 108 MHz SPI bus interface

Numonyx -> Micron 

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N25Q128 - 3 V

Volatile and Non Volatile Registers

Figure 8. Non Volatile and Volatile configuration Register Scheme

NVCR

(Non Volatile Configuratio n Register)

VCR (Volatile Co nfiguratio n Register)

and VECR (Volatile Enhanced

Co nfiguratio n Register)

Register download executed only

during the power on phase

Registers download executed after

a WRVCR or WRVECR

instructions, it overwrites NVCR

configurations on iCR

iCR

(internal Configuration Register)

Device behaviour

A Flag Status Register (FSR), 8 bits, is also available to check the status of the device,

detecting possible errors or a Program/Erase internal cycle in progress.

Each register can be read and modified by means of dedicated instructions in all the 3

protocols (Extended SPI, DIO-SPI, and QIO-SPI).

Reading time for all registers is comparable; writing time instead is very different: NVCR bits

are set as Flash Cell memory content requiring a longer time to perform internal writing

cycles. See Table 32.: AC Characteristics.

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