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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.  
be protected prior to the first sector unprotection  
write cycle to avoid any over-erase due to the intrin-  
sic erase characteristics of the protection cell. After  
the unprotection operation, all previously protected  
sectors will need to be individually re-protected.  
Standard microprocessor bus cycle timings are used  
in the unprotection and unprotect verification opera-  
tions. Three unprotect methods are provided in the  
ES29DL320 device. All unprotection and unprotect  
verification cycles are summarized in detail at the  
Table 1.  
If the system asserts V on the WP#/ACC pin, the  
IL  
device disables program and erase functions in the  
two “outermost” 8Kbytes boot sectors indepen-  
dently of whether those sectors were protected or  
unprotected using the method described in “Sector  
Group Protection and Unprotection”. The two outer-  
most of 8 Kbyte boot sectors are the two sectors  
containing the lowest addresses in a bottom-boot-  
configured device, or the two sectors containing the  
highest addresses in a top-boot-configured device.  
If the system asserts V on the WP#/ACC pin, the  
IH  
-
-
-
In-system unprotection  
A9 High-voltage unprotection  
Temporary sector unprotection  
device reverts to whether the two outermost 8  
Kbyte boot sectors were last set to be protected or  
unprotected. That is, sector protection or unprotec-  
tion for these two sectors depends on whether they  
were last protected or unprotected using the  
method described in “Sector Group Protection and  
Unprotection”.  
In-System Unprotection  
“In-system unprotection”, the primary method,  
requires V (8.5V~12.5V) on the RESET# with  
ID  
Note that the WP#/ACC pin must not be left floating  
or unconnected; inconsistent behavior of the device  
may result.  
A6=1, A1=1, and A0=0. This method can be imple-  
mented either in-system or via programming equip-  
ment. This method uses standard microprocessor  
bus cycle timing. Refer to Fig. 29 for timing diagram  
and Fig. 4 for the unprotection algorithm.  
A9 High-Voltage Unprotection  
START  
“High-voltage unprotection”, the alternate method  
intended only for programming equipment, must  
RESET# = VID  
(Note 1)  
force V (8.5V~12.5V) on address pin A9 and con-  
ID  
trol pin OE# with A6=1, A1=1 and A0=0. Refer to  
Fig. 32 for timing diagram and Fig. 6 for the unpro-  
tection algorithm.  
Perform Erase or  
Program Operations  
Temporary Sector Unprotect  
This feature allows temporary unprotection of previ-  
ously protected sectors to change data in-system.  
The Sector Unprotect mode is activated by setting  
RESET# = VIH  
the RESET# pin to V (8.5V~12.5V). During this  
ID  
Temporary Sector  
Unprotect Completed  
(Note 2)  
mode, formerly protected sectors can be pro-  
grammed or erased by selecting the sector  
addresses. Once V is removed from the RESET#  
ID  
pin, all the previously protected sectors are pro-  
tected again. Fig. 1 shows the algorithm, and Fig. 27  
shows the timing diagrams for this feature.  
Notes:  
1. All protected sectors are unprotected (If WP#/ACC = V ,  
IL  
outermost boot sectors will remain protected).  
2. All previously protected sectors are protected once again.  
WRITE PROTECT ( WP# )  
The write protect function provides a hardware  
method of protecting certain boot sectors without  
Figure 1. Temporary Sector Unprotect  
Operation  
using V . This function is one of two provided by the  
ID  
WP#/ACC pin.  
9
Rev. 0E May 25, 2006  
ES29DL320  
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