參數(shù)資料
型號(hào)： GE28F640W30TD70
廠商： INTEL CORP
元件分類： PROM
英文描述： 4M X 16 FLASH 1.8V PROM, 70 ns, PBGA56
封裝： 0.75 MM PITCH, VFBGA-56
文件頁(yè)數(shù)： 79/104頁(yè)
文件大小： 1443K
代理商： GE28F640W30TD70
28F640W30, 28F320W30, 28F128W30
June 2005
Intel Wireless Flash Memory (W30)
Datasheet
76
Order Number: 290702, Revision: 011
13.1.5
Lock During Erase Suspend
Block lock configurations can be performed during an erase suspend operation, using the standard
locking command sequences to unlock, lock, or lock-down a block. This feature is useful when
another block requires immediate updating.
To change block locking during an erase operation:
1. Write the Erase Suspend command.
2. Check SR[6] to determine that the erase operation has suspended.
3. Write the desired lock command sequence to a block.
The lock status changes.
4. After completing lock, unlock, read, or program operations, resume the erase operation with
the Erase Resume command (D0h).
If a block is locked or locked-down during a suspended erase of the same block, the locking status
bits change immediately. When the erase operation resumes, it completes normally.
Locking operations cannot occur during program suspend. Appendix A, “Write State Machine” on
page 90 shows valid commands during erase suspend.
13.1.6
Status Register Error Checking
Using nested locking or program command sequences during erase suspend can introduce
ambiguity into status register results.
Because locking changes require 2-cycle command sequences—for example, 60h followed by 01h
to lock a block—following the Configuration Setup command (60h) with an invalid command
produces a command sequence error (SR[5:4]=11b).
If a Lock Block command error occurs during erase suspend, the flash device sets SR[4] and SR[5]
to 1 even after the erase resumes. When erase is complete, possible errors during the erase cannot
be detected from the status register, because of the previous locking command error. A similar
situation occurs if a program operation error is nested within an erase suspend.
13.1.7
WP# Lock-Down Control
The Write Protect signal, WP#, adds an additional layer of block security. WP# affects only blocks
that previously had the Lock-Down command written to them.
After the lock-down status bit is set for a block, asserting WP# forces that block into the
lock-down state [011] and prevents it from being unlocked.
After WP# is deasserted, the state of the block reverts to locked [111]. Software commands
can then unlock the block (for erase or program operations) and subsequently re-lock it.
Only flash device reset or power-down can clear the lock-down status bit and render WP#
ineffective.
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