M28W640HCT70N6E NUMONYX, M28W640HCT70N6E Datasheet - Page 21

• Manufacturer Part Number: M28W640HCT70N6E
• Description: TSOP-1 48 12X20 CUSTD FLASH
• Manufacturer: NUMONYX

M28W640HCT, M28W640HCB
4.14
4.15
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 lock status can be monitored for each block using the Read Electronic Signature
command.
Refer to the
Block Lock-down command
A locked block cannot be programmed or erased, or have its protection status changed
when WP is Low, V
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 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.
Lock-down command. Refer to the
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.
Table 10
Section 5: Block
IL
shows the protection status after issuing a Block Unlock command.
. When WP is High, V
locking, for a detailed explanation.
Table 10
Section 5: Block locking
shows the protection status after issuing a Block
IH,
the Lock-down function is disabled and the
for a detailed explanation.
Command interface
21/72