M25PX16 Numonyx, M25PX16 Datasheet - Page 32

• Manufacturer Part Number: M25PX16
• Description: 16-mbit, Dual I/o, 4-kbyte Subsector Erase, Serial Flash Memory With 75 Mhz Spi Bus Interface
• Manufacturer: Numonyx

6.10
32/61
Table 9.
1. Values of (b1, b0) after power-up are defined in
Figure 15. Read Lock Register (RDLR) instruction sequence and data-out sequence
Read OTP (ROTP)
The device is first selected by driving Chip Select (S) Low. The instruction code for the Read
OTP (ROTP) instruction is followed by a 3-byte address (A23- A0) and a dummy byte. Each
bit is latched in on the rising edge of Serial Clock (C).
Then the memory contents at that address are shifted out on Serial Data output (DQ1).
Each bit is shifted out at the maximum frequency, f
(C). The instruction sequence is shown in
The address is automatically incremented to the next higher address after each byte of data
is shifted out.
There is no rollover mechanism with the Read OTP (ROTP) instruction. This means that the
Read OTP (ROTP) instruction must be sent with a maximum of 65 bytes to read, since once
the 65
The Read OTP (ROTP) instruction is terminated by driving Chip Select (S) High. Chip
Select (S) can be driven High at any time during data output. Any Read OTP (ROTP)
DQ0
DQ1
b7-b2
Bit
b1
b0
C
S
th
byte has been read, the same (65
Sector Lock Down
Sector Write Lock
Lock Register out
Bit name
0
1
High Impedance
2
Instruction
3
4
5
Value
‘1’
‘0’
‘1’
‘0’
6
(1)
7
MSB
23
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.
8
22 21
9 10
24-bit address
Section 7: Power-up and
Figure
th
) byte keeps being read on the DQ1 pin.
Reserved
3
28 29 30 31 32 33 34 35
16.
2
C
max,
1
0
on
MSB
Function
7
the falling edge of Serial Clock
6
power-down.
Lock Register Out
5
4
3
36 37 38
2
1
0
39
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