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M58WR016QT Datasheet(PDF) 25 Page - Numonyx B.V

Part # M58WR016QT
Description  16 Mbit and 32 Mbit (x16, Multiple Bank, Burst) 1.8V supply Flash memories
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Manufacturer  NUMONYX [Numonyx B.V]
Direct Link  http://www.numonyx.com
Logo NUMONYX - Numonyx B.V

M58WR016QT Datasheet(HTML) 25 Page - Numonyx B.V

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M58WR016QT, M58WR016QB, M58WR032QT, M58WR032QB Command interface - standard com-
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5.12
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 first bus cycle sets up the Block Lock command.
The second Bus Write cycle latches the block address.
The lock status can be monitored for each block using the Read Electronic Signature
command. Table 14 shows the Lock Status after issuing a Block Lock command.
The Block Lock bits are volatile, once set they remain set until a hardware reset or power-
down/power-up. They are cleared by a Block Unlock command. Refer to the section, Block
Locking, for a detailed explanation. See Appendix C, Figure 26: Locking operations
flowchart and pseudo code, for a flowchart for using the Lock command.
5.13
Block Unlock command
The Block Unlock command is used to unlock a block, allowing the block to be programmed
or erased. Two Bus Write cycles are required to issue the Block Unlock command.
The first bus cycle sets up the Block Unlock command.
The second Bus Write cycle latches the block address.
The lock status can be monitored for each block using the Read Electronic Signature
command. Table 14 shows the protection status after issuing a Block Unlock command.
Refer to the section, Block Locking, for a detailed explanation and Appendix C, Figure 26:
Locking operations flowchart and pseudo code, for a flowchart for using the Unlock
command.
5.14
Block Lock-Down command
A locked or unlocked block can be locked-down by issuing the Block Lock-Down command.
A locked-down block cannot be programmed or erased, or have its protection status
changed when WP is low, VIL. When WP is high, VIH, the Lock-Down function is disabled
and the locked blocks can be individually unlocked by the Block Unlock command.
Two Bus Write cycles are required to issue the Block Lock-Down command.
The first bus cycle sets up the Block Lock command.
The second Bus Write cycle latches the block address.
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. Table 14 shows the Lock Status after issuing a Block Lock-
Down command. Refer to the section, Block Locking, for a detailed explanation and
Appendix C, Figure 26: Locking operations flowchart and pseudo code, for a flowchart for
using the Lock-Down command.


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