M29W256GH7AN6E NUMONYX, M29W256GH7AN6E Datasheet - Page 26

• Manufacturer Part Number: M29W256GH7AN6E
• Description: Flash Mem Parallel 3V/3.3V 256M-Bit 32M x 8/16M x 16 70ns 56-Pin TSOP Tray
• Manufacturer: NUMONYX

Specifications of M29W256GH7AN6E

• Package: 56TSOP
• Cell Type: NOR
• Density: 256 Mb
• Architecture: Sectored
• Block Organization: Symmetrical
• Location Of Boot Block: Bottom|Top
• Typical Operating Supply Voltage: 3|3.3 V
• Sector Size: 128KByte x 256
• Timing Type: Asynchronous
• Operating Temperature: -40 to 85 °C
• Interface Type: Parallel

5.4.2
5.4.3
5.4.4
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Non-volatile protection mode lock bit (DQ1)
The non-volatile protection mode lock bit, DQ1, is one-time programmable. Programming
(change the first apex to ‘0’) this bit permanently places the device in non-volatile protection
mode.
By default the memory operates in non-volatile protection mode independently whether the
non-volatile protection mode lock bit, DQ1, is programmed. From Factory the memory
blocks can be either unprotected (change the first apex to ‘1’) or protected (change the first
apex to ‘0’), according to the ordering option that has been chosen.
Any attempt to program the non-volatile protection mode lock bit when the password
protection mode bit is programmed causes the operation to abort and the device to return to
read mode.
Password protection mode lock bit (DQ2)
The password protection mode lock bit, DQ2, is one-time programmable. Programming
(setting to ‘0’) this bit permanently places the device in password protection mode.
Any attempt to program the password protection mode lock bit when the non-volatile
protection mode bit is programmed causes the operation to abort and the device to return to
read mode.
DQ15 to DQ3 reserved
DQ15 to DQ3 are reserved and during programming they must be held at '1'.
Table 10.
1. DQ0, DQ1 and DQ2 lock register bits are set to ‘1’ when shipped from the factory.
Table 11.
1. If the NVPB lock bit is set to ‘0’, all NVPBs are locked. If the NVPB lock bit is set to ‘1’, all NVPBs are
NVPB lock bit
unlocked.
Reserved
DQ15-3
0
0
0
1
1
1
Lock register bits
Block protection status
(1)
Password protection mode
NVPB
Block
0
1
1
0
1
1
(2)
lock bit
DQ2
(1)
VPB
Block
x
1
0
x
0
1
(3)
protection
status
Block
01h
00h
00h
01h
01h
00h
Non-volatile protection
mode lock bit
Block protected (non-volatile protection
Block protected (non-volatile protection
DQ1
Block protected (volatile protection
Block protected (volatile protection
Block protection status
Block unprotected
Block unprotected
through NVPB)
through NVPB)
through VPB)
through VPB)
Extended block
protection bit
DQ0