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EX29DS160-90RTCI 参数 Datasheet PDF下载

EX29DS160-90RTCI图片预览
型号: EX29DS160-90RTCI
PDF下载: 下载PDF文件 查看货源
内容描述: 32兆( 4M ×8 / 2M ×16 )的CMOS 3.0伏只,同时操作闪存 [32Mbit(4M x 8/2M x 16) CMOS 3.0 Volt-only, Simultaneous Operation Flash Memory]
分类和应用: 闪存
文件页数/大小: 59 页 / 771 K
品牌: EXCELSEMI [ EXCEL SEMICONDUCTOR INC. ]
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E S I  
E S I  
ADVANCED INFORMATION  
Excel Semiconductor inc.  
can only occur after successful completion of spe-  
cific command sequences. And several features are  
incorporated to prevent inadvertent write cycles  
resulting from Vcc power-up and power-down transi-  
tion or system noise.  
Start  
If data=00h, security  
RESET# =  
VIH or VID  
sector is unprotected.  
If data=01h, security  
sector is protected  
Low Vcc Write inhibit  
When Vcc is less than V  
, the device does not  
LKO  
Wait 1us  
accept any write cycles. This protects data during  
Vcc power-up and power-down. The command reg-  
ister and all internal program/erase circuits are dis-  
abled, and the device resets to the read mode.  
Subsequent writes are ignored until Vcc is greater  
Remove VIH or VID  
from RESET#  
Write 60h to  
any address  
Write reset  
command  
than V  
. The system must provide proper signals  
LKO  
Write 40h to security  
sector address with  
A6=0, A1=1,A0=0  
to the control pins to prevent unintentional writes  
when Vcc is greater than V  
.
LKO  
Security sector  
Protect Verify  
complete  
Write Pulse “Glitch” Protection  
Read from security  
sector address with  
A6=0,A1=1,A0=0  
Noise pulses of less than 5ns (typical) on OE#, CE#  
or WE# do not initiate a write cycle.  
Logical inhibit  
Write cycles are inhibited by holding any one of  
Figure 2. Security Sector Protect Verify  
Exit from the Security Sector  
OE#=V , CE#=V or WE#=V . To initiate a write  
IL  
IH  
IH  
cycle, CE# and WE# must be a logical zero while  
OE# is a logical one.  
Power-up Write Inhibit  
Once the Security Sector is locked protected and  
verified, the system must write the Exit Security  
Sector Region command sequence to return to  
reading and writing the remainder of the array.  
If WE#=CE#=V and OE#=V during power up, the  
IL  
IH  
device does not accept any commands on the rising  
edge of WE#. The internal state machine is automat-  
ically reset to the read mode on power-up.  
Caution for the Security Sector Protection  
The security sector protection must be used with  
caution since, once protected, there is no proce-  
dure available for unprotecting the security sector  
area and none of the bits in the security sector  
memory space can be modified in any way.  
HARDWARE DATA PROTECTION  
The ES29DL320 device provides some protection  
measures against accidental erasure or program-  
ming caused by spurious system level signals that  
may exist during power transition. During power-  
up, all internal registers and latches in the device  
are cleared and the device automatically resets to  
the read mode. In addition, with its internal state  
machine built-in the device, any alteration of the  
memory contents or any initiation of new operation  
11  
Rev. 0E May 25, 2006  
ES29DL320  
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