m28w160ec Numonyx, m28w160ec Datasheet - Page 13

• Manufacturer Part Number: m28w160ec
• Description: 16 Mbit 1mb X16, Boot Block 3v Supply Flash Memory
• Manufacturer: Numonyx

Register error. The protection of the Protection
Register and/or the Security Block is not revers-
ible.
The Protection Register Program cannot be sus-
pended.
23., Protection Register Program Flowchart and
Pseudo
tection Register Program command.
Block Lock Command
The Block Lock command is used to lock a block
and prevent Program or Erase operations from
changing the data in it. All blocks are locked at
power-up or reset.
Two Bus Write cycles are required to issue the
Block Lock command.
■
■
The lock status can be monitored for each block
using the Read Electronic Signature command.
Table 9.
a Block Lock command.
The Block Lock bits are volatile, once set they re-
main set until a hardware reset or power-down/
power-up. They are cleared by a Blocks Unlock
command. Refer to the section, Block Locking, for
a detailed explanation.
Block Unlock Command
The Blocks Unlock command is used to unlock a
block, allowing the block to be programmed or
The first bus cycle sets up the Block Lock
command.
The second Bus Write cycle latches the block
address.
Code, for the flowchart for using the Pro-
shows the protection status after issuing
See
APPENDIX
C.,
Figure
erased. Two Bus Write cycles are required to is-
sue the Blocks Unlock command.
■
■
The lock status can be monitored for each block
using the Read Electronic Signature command.
Table 9.
a Block Unlock command. Refer to the section,
Block Locking, for a detailed explanation.
Block Lock-Down Command
A locked block cannot be Programmed or Erased,
or have its protection status changed when WP is
low, V
function is disabled and the locked blocks can be
individually unlocked by the Block Unlock com-
mand.
Two Bus Write cycles are required to issue the
Block Lock-Down command.
■
■
The lock status can be monitored for each block
using the Read Electronic Signature command.
Locked-Down blocks revert to the locked (and not
locked-down) state when the device is reset on
power-down.
after issuing a Block Lock-Down command. Refer
to the section, Block Locking, for a detailed expla-
nation.
The first bus cycle sets up the Block Unlock
command.
The second Bus Write cycle latches the block
address.
The first bus cycle sets up the Block Lock
command.
The second Bus Write cycle latches the block
address.
IL
. When WP is high, V
shows the protection status after issuing
Table 9.
M28W160ECT, M28W160ECB
shows the protection status
IH,
the Lock-Down
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