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A800DB90PF 参数 Datasheet PDF下载

A800DB90PF图片预览
型号: A800DB90PF
PDF下载: 下载PDF文件 查看货源
内容描述: 8兆位( 1一M× 8位/ 512的K× 16位) CMOS 1.8伏只超低电压闪存 [8 Megabit (1 M x 8-Bit/512 K x 16-Bit) CMOS 1.8 Volt-only Super Low Voltage Flash Memory]
分类和应用: 闪存
文件页数/大小: 46 页 / 1066 K
品牌: AMD [ AMD ]
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D A T A S H E E T  
address must appear on the appropriate highest order  
Autoselect Mode  
address bits (see Table 2 on page 10 and Table 3 on  
page 11). Table 4 shows the remaining address bits  
that are don’t care. When all necessary bits have been  
set as required, the programming equipment may then  
read the corresponding identifier code on DQ7–DQ0.  
The autoselect mode provides manufacturer and  
device identification, and sector protection verification,  
through identifier codes output on DQ7–DQ0. This  
mode is primarily intended for programming equipment  
to automatically match a device to be programmed with  
its corresponding programming algorithm. However,  
the autoselect codes can also be accessed in-system  
through the command register.  
To access the autoselect codes in-system, the host  
system can issue the autoselect command via the  
command register, as shown in Table 5 on page 19.  
This method does not require VID. See Command  
Definitions‚ on page 14 for details on using the autose-  
lect mode.  
When using programming equipment, the autoselect  
mode requires VID on address pin A9. Address pins  
A6, A1, and A0 must be as shown in Table 4. In addi-  
tion, when verifying sector protection, the sector  
Table 4. Am29SL800D Autoselect Code (High Voltage Method)  
A18 A11  
to to  
WE# A12 A10  
A8  
to  
A7  
A5  
to  
A2  
DQ8  
to  
DQ15  
DQ7  
to  
DQ0  
Description  
Mode  
CE#  
L
OE#  
A9  
A6  
A1  
A0  
Manufacturer ID: AMD  
L
L
H
H
X
X
VID  
X
X
L
X
X
L
L
X
01h  
Device ID:  
Am29SL800D  
(Top Boot Block)  
Word  
L
22h  
EAh  
X
X
VID  
L
L
L
L
H
H
Byte  
Word  
Byte  
L
L
L
L
L
L
H
H
H
X
22h  
X
EAh  
6Bh  
Device ID:  
Am29SL800D  
(Bottom Boot Block)  
X
X
X
VID  
X
X
X
X
6Bh  
X
01h (protected)  
Sector Protection Verification  
L
L
H
SA  
VID  
L
H
L
00h  
(unprotected)  
X
L = Logic Low = VIL, H = Logic High = VIH, SA = Sector Address, X = Don’t care.  
through AMD’s ExpressFlash™ Service. Contact an  
AMD representative for details.  
Sector Protection/Unprotection  
The hardware sector protection feature disables both  
program and erase operations in any sector. The hard-  
ware sector unprotection feature re-enables both  
program and erase operations in previously protected  
sectors. Sector protection/unprotection can be imple-  
mented via two methods.  
It is possible to determine whether a sector is protected  
or unprotected. See Autoselect Mode‚ on page 12 for  
details.  
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 the  
Sector Protection/ Unprotection requires V on the  
ID  
RESET# pin only, and can be implemented either in-  
system or via programming equipment. Figure 1, on  
page 13 shows the algorithms and Figure 23, on page  
36 shows the timing diagram. For sector unprotect, all  
unprotected sectors must first be protected prior to the  
first sector unprotect write cycle.  
RESET# pin to V . During this mode, formerly pro-  
ID  
tected sectors can be programmed or erased by  
selecting the sector addresses. Once V is removed  
ID  
from the RESET# pin, all the previously protected  
sectors are protected again. Figure 2, on page 14  
shows the algorithm, and Figure 22, on page 35 shows  
the timing diagrams, for this feature.  
The device is shipped with all sectors unprotected.  
AMD offers the option of programming and protecting  
sectors at its factory prior to shipping the device  
12  
Am29SL800D  
27546A6 January 23, 2007  
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