參數(shù)資料
型號： GE28F128W30T90
英文描述： EEPROM|FLASH|8MX16|CMOS|BGA|60PIN|PLASTIC
中文描述： 的EEPROM | FLASH動畫| 8M × 16位|的CMOS | BGA封裝| 60PIN |塑料
文件頁數(shù)： 38/91頁
文件大小： 994K
代理商： GE28F128W30T90
1.8 Volt Intel
Wireless Flash Memory with 3 Volt I/O
38
Datasheet
7.1.4
Block Lock Status
Every block’s lock status can be read in read identifier mode. To enter this mode, issue the Read
Identifier command to the device. Subsequent reads at Block Base Address + 02h will output that
block’s lock status. For example, to read the block lock status of block 10, the address sent to the
device should be 50002h (for a top-parameter device). The lowest two data bits of the read data, D1
and D0, represent the lock status. D0 indicates the block lock status. It is set by the Lock Block
command and cleared by the Block Unlock command. It is also set when entering the lock-down
state. D1 indicates lock-down status and is set by the Lock-Down command. The lock-down status
bit cannot be cleared by software–only by device reset or power-down. See
Table 11
.
7.1.5
Lock During Erase Suspend
Block lock configurations can be performed during an erase suspend operation by 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, first write the Erase Suspend command. After
checking SR[6] to determine the erase operation has suspended, write the desired lock command
sequence to a block; the lock status will be changed. 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 is resumed, it will complete normally.
Locking operations cannot occur during program suspend.
Appendix A, “Write State Machine
States” on page 77
shows valid commands during erase suspend.
7.1.6
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 device sets SR[4] and SR[5] to 1 even after the erase is resumed. 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.
Table 11. Write Protection Truth Table
VPP
WP#
RST#
Write Protection
X
X
V
IL
Device inaccessible
V
IL
X
V
IH
Word program and block erase prohibited
X
V
IL
V
IH
All lock-down blocks locked
X
V
IH
V
IH
All lock-down blocks can be unlocked
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