M25PE40-VMW6TG Micron Technology Inc, M25PE40-VMW6TG Datasheet - Page 30

• Manufacturer Part Number: M25PE40-VMW6TG
• Manufacturer: Micron Technology Inc

Specifications of M25PE40-VMW6TG

• Cell Type: NOR
• Density: 4Mb
• Access Time (max): 15ns
• Interface Type: Serial (SPI)
• Boot Type: Not Required
• Address Bus: 1b
• Operating Supply Voltage (typ): 3.3V
• Operating Temp Range: -40C to 85C
• Package Type: SOIC W
• Sync/async: Synchronous
• Operating Temperature Classification: Industrial
• Operating Supply Voltage (min): 2.7V
• Operating Supply Voltage (max): 3.6V
• Word Size: 8b
• Number Of Words: 512K
• Supply Current: 8mA
• Mounting: Surface Mount
• Pin Count: 8
• Lead Free Status / Rohs Status: Compliant

Instructions
6.8
Note:
30/62
Read Lock Register (RDLR)
The Read Lock Register (RDLR) instruction is decoded only in the M25PE40 in the T9HX
process (see
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 (or subsector). 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 (Q), each bit being shifted out, at a maximum frequency f
falling edge of Serial Clock (C).
The instruction sequence is shown in
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.
Table 9.
Figure 14. Read Lock Register (RDLR) instruction sequence and data-out sequence
S
C
D
Q
b7-b4
Bit
b1
b0
Sector Write
Sector Lock
Bit name
0
Down
Lock Registers
Lock
Important note on page
1
High Impedance
2
Instruction
3
4
Value
5
‘1’
‘0’
‘1’
‘0’
6
7
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 reset or power-up.
The Write Lock and Lock Down bits can be changed by writing
new values to them (default value).
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 (default value).
MSB
23
8
22 21
9 10
Figure
24-bit address
6).
14.
Reserved
3
28 29 30 31 32 33 34 35
2
1
0
MSB
Function
7
6
Lock Register Out
5
4
3
36 37 38
2
1
C
, during the
0
39
M25PE40
AI10783