n25q032 Numonyx, n25q032 Datasheet - Page 84

• Manufacturer Part Number: n25q032
• Description: 32-mbit 3 V, Multiple I/o, 4-kbyte Subsector Erase, Xip Enabled, Serial Flash Memory With 108 Mhz Spi Bus Interface
• Manufacturer: Numonyx

9.1.25
Table 19.
1. Values of (b1, b0) after power-up are defined in
84/160
b7-b2
Bit
b1
b0
DQ0
DQ1
C
S
Sector Lock
Write Lock
Bit name
Sector
Down
Read Lock Register (RDLR)
The device is first selected by driving Chip Select (S) Low. The instruction code for the Read
Lock Register (RDLR) instruction is followed by a 3-byte address (A23-A0) pointing to any
location inside the concerned sector. Each address bit is latched-in during the rising edge of
Serial Clock (C). Then the value of the Lock Register is shifted out on Serial Data output
(DQ1), each bit being shifted out, at a maximum frequency fC, during the falling edge of
Serial Clock (C).
The Read Lock Register (RDLR) instruction is terminated by driving Chip Select (S) High at
any time during data output.
Any Read Lock Register (RDLR) instruction, while an Erase, Program or Write cycle is in
progress, is rejected without having any effects on the cycle that is in progress.
Figure 33. Read Lock Register instruction and data-out sequence
*Address bits A23 and A22 are “Don’t Care.”
Lock Register out
0
1
High Impedance
Value
‘1’
‘0’
‘1’
‘0’
2
Instruction
3
The Write Lock and Lock Down bits cannot be changed. Once a ‘1’ is written to the
Lock Down bit it cannot be cleared to ‘0’, except by a power-up.
The Write Lock and Lock Down bits can be changed by writing new values to them.
Write, Program and Erase operations in this sector will not be executed. The
memory contents will not be changed.
Write, Program and Erase operations in this sector are executed and will modify the
sector contents.
4
(1)
5
6
7
MSB
23
Section 7: Protection
8
22 21
9 10
*24-bit Address
Reserved
3
28 29 30 31 32 33 34 35
2
modes.
1
Function
0
MSB
7
6
Lock Register Out
5
4
3
36 37 38
2
1
0
39