512Mb, Multiple I/O Serial Flash Memory
XIP Mode
Figure 37: XIP Mode Directly After Power-On
Mode 3
Mode 0
0
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16
C
t
VSI (<100µ)
VCC
NVCR check:
XIP enabled
S#
A[MIN]
LSB
DOUT DOUT DOUT DOUT DOUT
Xb
DQ0
DOUT DOUT DOUT DOUT DOUT
MSB
DQ[3:1]
A[MAX]
Dummy cycles
1. 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.
Note:
Confirmation Bit Settings Required to Activate or Terminate XIP
The XIP confirmation bit setting activates or terminates XIP after it has been enabled or
disabled. This bit is the value on DQ0 during the first dummy clock cycle in the FAST
READ operation. In dual I/O XIP mode, the value 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."
Table 31: XIP Confirmation Bit
Bit Value
Description
0
1
Activates XIP: While this bit is 0, XIP remains activated.
Terminates XIP: When this bit is set to 1, XIP is terminated and the device returns
to SPI.
Table 32: Effects of Running XIP in Different Protocols
Protocol
Effect
Extended I/O and Dual I/O
In a device with a dedicated part number where RST# is enabled, a LOW pulse
on that pin resets XIP and the device to the state it was in previous to the last
power-up, as defined by the nonvolatile configuration register.
Dual I/O
Values of DQ1 during the first dummy clock cycle are "Don't Care."
PDF: 09005aef84752721
n25q_512mb_1ce_3V_65nm.pdf - Rev. O 05/13 EN
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