n25q256 Numonyx, n25q256 Datasheet - Page 43

• Manufacturer Part Number: n25q256
• Description: 256-mbit 3 V, Multiple I/o, 4-kbyte Subsector Erase, Xip Enabled, Serial Flash Memory With 108 Mhz Spi Bus Interface
• Manufacturer: Numonyx

N25Q256 - 3 V
6.2.8
Figure 16. 4-Byte Address Mode Default by NVCR
6.3
Other instructions not involved are
except for the Read Serial Flash
Discovery Parameter instruction.
All operations need 4B address,
Bottom 128Mb selected
making segment default in bottom 128Mb segment, if the application sets this bit to 0 the
selected segment will be the upper 128Mb right after the next power on.
Address mode selection NV configuration bit (NVCR bit 0)
The address mode selection NV configuration bit can be used to set the addressing mode
directly after the power on sequence. The products are delivered with this set to 1, making
default address mode in 3-byte address mode, if the application sets this bit to 0 the address
mode will be the 4-byte address mode right after the next power on. The figure here shows
how NVCR<1:0> bits affect working diagram.
Volatile Configuration Register
The Volatile Configuration Register (VCR) affects the memory configuration after every
execution of Write Volatile Configuration Register (WRVCR) instruction: this instruction
overwrite the memory configuration set at POR by the Non Volatile Configuration Register
(NVCR). Its purpose is to define the dummy clock cycles number and to make the device
ready to enter in the required XIP mode.
available
EAR<0> = 0
Yes
No
EN4BYTEADDR
No
(B7h)
Upper 128 Mb
EX4BYTEADDR (E9h)
No
NVCR<1> = 0
NVCR<0> = 0
EAR<0> = 1
Power-up
Yes
Yes
Yes
executed in the 128MB defined by
NVCR<1>. Other instructions are
0. This value can be modified by
bounded in it, EAR<0> default =
selected
defined by EAR <0> but are not
Matrix modify operations are
EAR<0>. Read operations in
matrix start from the 128MB
Micron Technology, Inc., reserves the right to change products or specifications without notice.
No
not involved .
Instruction
Other instructions
Volatile and Non Volatile Registers
WREAR
©2010 Micron Technology, Inc. All rights reserved.
Define a value for EAR<0>
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