n25q256 Numonyx, n25q256 Datasheet - Page 166

• 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

XIP Operations
10.3
166/186
DQ0
DQ3
DQ1
DQ2
Xb is the XIP Confirmation bit and should be set as follows: 0 to keep XIP state; 1 to exit XIP mode and return to standard read mode.
C
S
Mode 3
Mode 0
Figure 134. XiP: enter by VCR 2/2 (QIOFR in normal SPI protocol example)
XIP mode hold and exit
The XIP mode does require at least one additional clock cycle to allow the XIP Confirmation
bit to be sent to the memory on DQ0 during the first dummy clock cycle.
The device decodes the XIP Confirmation bit with the scheme:
In Dual I/O XIP mode, the values of DQ1 during the first dummy clock cycle after the
addresses is always Don't Care.
In Quad I/O XIP mode, the values of DQ3, DQ2 and DQ1 during the first dummy clock cycle
after the addresses are always Don't Care.
In Dual and Single I/O XIP mode, in presence of the RESET pin enabled (in devices with a
dedicated part number), a low pulse on that pin resets the XIP protocol as defined by the
Volatile Configuration Register, reporting the memory at the state of last power up, as
defined by the Non Volatile Configuration Register. In Quad I/O XiP modes, it is possible to
reset the memory (for devices with a dedicated part number) only when the device is
deselected. See
XIP Confirmation bit=0 means to hold XIP Mode
XIP Confirmation bit=1 means to exit XIP Mode and comes back to read mode, that
means codifying the first byte after the next chip select as an instruction code.
0
‘1’
Don’t Care
Don’t Care
1
2
Instruction
3
Section 16: Ordering
4
5
6
7
22 18 14 10
23 19 15 11
20 16 12 8
21 17 13 9
8
24-bit Address
9 10 11 12 13 14
information.
6
7
Micron Technology, Inc., reserves the right to change products or specifications without notice.
4
5
0
1
2
3
Xb
Dummy (ex.: 6)
15 16
17 18
19
20
6
5
7
©2010 Micron Technology, Inc. All rights reserved.
4
Byte 1
IO switches from Input to Output
21
2
3
0
1
22
6
7
4
5
Byte 2
23
2
3
0
1
7
5
6
4
N25Q256 - 3 V