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MT28F322D18FH-80BET 参数 Datasheet PDF下载

MT28F322D18FH-80BET图片预览
型号: MT28F322D18FH-80BET
PDF下载: 下载PDF文件 查看货源
内容描述: FL灰内存 [FLASH MEMORY]
分类和应用:
文件页数/大小: 44 页 / 519 K
品牌: MICRON [ MICRON TECHNOLOGY ]
 浏览型号MT28F322D18FH-80BET的Datasheet PDF文件第21页浏览型号MT28F322D18FH-80BET的Datasheet PDF文件第22页浏览型号MT28F322D18FH-80BET的Datasheet PDF文件第23页浏览型号MT28F322D18FH-80BET的Datasheet PDF文件第24页浏览型号MT28F322D18FH-80BET的Datasheet PDF文件第26页浏览型号MT28F322D18FH-80BET的Datasheet PDF文件第27页浏览型号MT28F322D18FH-80BET的Datasheet PDF文件第28页浏览型号MT28F322D18FH-80BET的Datasheet PDF文件第29页  
2 MEG x 16  
ASYNC/PAGE/BURST FLASH MEMORY  
LOCKED DOWN STATE  
Blocks that are locked down (state [011]) are pro-  
tected from PROGRAM and ERASE operations, but their  
protectionstatuscannotbechangedusingsoftwarecom-  
mands alone. A locked or unlocked block can be locked  
down by writing the lock down command sequence, 60h  
followed by 2Fh. Locked down blocks revert to the locked  
state when the device is reset or powered down.  
UNLOCK command. It is also automatically set when  
entering lock down. DQ1 indicates lock down status and  
is set by the LOCK DOWN command. It can only be  
cleared by reset or power-down, not by software. Table  
11 shows the locking state transition scheme. The READ  
ARRAY command, FFh, must be issued to the bank con-  
taining address 00h prior to issuing other commands.  
The LOCK DOWN function is dependent on the WP#  
input. When WP# = 0, blocks in lock down [011] are  
protected from program, erase, and lock status changes.  
When WP# = 1, the lock down function is disabled ([111]),  
and locked down blocks can be individually unlocked by  
a software command to the [110] state, where they can be  
erased and programmed. These blocks can then be  
relocked [111] and unlocked [110] as desired while WP#  
remains ꢁIGꢁ. When WP# goes LOW, blocks that were  
previously locked down return to the locked down state  
[011] regardless of any changes made while WP# was  
ꢁIGꢁ. Device reset or power-down resets all locks, in-  
cluding those in lock down, to locked state (see Table 12).  
LOCKING OPERATIONS DURING ERASE SUSPEND  
Changes to block lock status can be performed during  
an ERASE SUSPEND by using the standard locking com-  
mand sequences to unlock, lock, or lock down. This is  
useful in the case when another block needs to be up-  
dated while an ERASE operation is in progress.  
To change block locking during an ERASE operation,  
first write the ERASE SUSPEND command (B0h), then  
check the status register until it indicates that the ERASE  
operation has been suspended. Next, write the desired  
lock command sequence to block lock, and the lock sta-  
tus will be changed. After completing any desired LOCK,  
READ, or PROGRAM operations, resume the ERASE op-  
eration with the ERASE RESUME command (D0h).  
If a block is locked or locked down during an  
ERASE SUSPEND operation on the same block, the lock-  
ing status bits will be changed immediately. Then, when  
the ERASE is resumed, the ERASE operation will com-  
plete.  
READING A BLOCK’S LOCK STATUS  
The lock status of every block can be read in the read  
deviceidentificationmode. Toenter this mode, write 90h  
to the bank containing address 00h. Subsequent READs  
at block address +00002 will output the lock status of that  
block. The lowest two outputs, DQ0 and DQ1, represent  
the lock status. DQ0 indicates the block lock/unlock sta-  
tus and is set by the LOCK command and cleared by the  
A locking operation cannot be performed during a  
PROGRAM SUSPEND.  
Table 11  
Block Locking State Transition  
ERASE/PROG  
ALLOWED  
LOCK  
DOWN  
WP#  
DQ1  
DQ0  
NAME  
Unlocked  
LOCK  
UNLOCK  
No Change  
To [000]  
0
0
0
1
1
1
0
0
1
0
0
1
0
1
1
0
1
0
Yes  
No  
To [001]  
To [011]  
To [011]  
No Change  
To [111]  
To [111]  
To [111]  
Locked (Default)  
Lock Down  
Unlocked  
No Change  
No Change  
To [101]  
No  
No Change  
No Change  
To [100]  
Yes  
No  
Locked  
No Change  
To [111]  
Lock Down  
Disabled  
Yes  
No Change  
1
1
1
Lock Down  
Disabled  
No  
No Change  
To [110]  
No Change  
2 Meg x 16 Async/Page/Burst Flash Memory  
MT28F322D20FH_4.p65 – Rev. 4, Pub. 7/02  
Micron Technology, Inc., reserves the right to change products or specifications without notice.  
©2002, Micron Technology, Inc.  
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