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S29AL008D70TAI020 参数 Datasheet PDF下载

S29AL008D70TAI020图片预览
型号: S29AL008D70TAI020
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 3.0伏只引导扇区闪存 [8 Megabit (1 M x 8-Bit/512 K x 16-Bit) CMOS 3.0 Volt-only Boot Sector Flash Memory]
分类和应用: 闪存内存集成电路光电二极管
文件页数/大小: 55 页 / 1519 K
品牌: SPANSION [ SPANSION ]
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D a t a S h e e t  
The system must issue the reset command to re-enable the device for reading  
array data if DQ5 goes high, or while in the autoselect mode. See the Reset Com-  
mand, next.  
See also Requirements for Reading Array Data, on page 11 for more information.  
The table provides the read parameters, and Figure 13, on page 38 shows the  
timing diagram.  
Reset Command  
Writing the reset command to the device resets the device to reading array data.  
Address bits are don’t care for this command.  
The reset command may be written between the sequence cycles in an erase  
command sequence before erasing begins. This resets the device to reading array  
data. Once erasure begins, however, the device ignores reset commands until the  
operation is complete.  
The reset command may be written between the sequence cycles in a program  
command sequence before programming begins. This resets the device to read-  
ing array data (also applies to programming in Erase Suspend mode). Once  
programming begins, however, the device ignores reset commands until the op-  
eration is complete.  
The reset command may be written between the sequence cycles in an autoselect  
command sequence. Once in the autoselect mode, the reset command must be  
written to return to reading array data (also applies to autoselect during Erase  
Suspend).  
If DQ5 goes high during a program or erase operation, writing the reset command  
returns the device to reading array data (also applies during Erase Suspend).  
Autoselect Command Sequence  
The autoselect command sequence allows the host system to access the manu-  
facturer and devices codes, and determine whether or not a sector is protected.  
Table 5, on page 25 shows the address and data requirements. This method is an  
alternative to that shown in Table 4, on page 16, which is intended for PROM pro-  
grammers and requires V on address bit A9.  
ID  
The autoselect command sequence is initiated by writing two unlock cycles, fol-  
lowed by the autoselect command. The device then enters the autoselect mode,  
and the system may read at any address any number of times, without initiating  
another command sequence.  
A read cycle at address XX00h retrieves the manufacturer code. A read cycle at  
address XX01h in word mode (or 02h in byte mode) returns the device code. A  
read cycle containing a sector address (SA) and the address 02h in word mode  
(or 04h in byte mode) returns 01h if that sector is protected, or 00h if it is un-  
protected. Refer to Table 2, on page 14 and Table 3, on page 15 for valid sector  
addresses.  
The system must write the reset command to exit the autoselect mode and return  
to reading array data.  
Word/Byte Program Command Sequence  
The system may program the device by word or byte, depending on the state of  
the BYTE# pin. Programming is a four-bus-cycle operation. The program com-  
mand sequence is initiated by writing two unlock write cycles, followed by the  
20  
S29AL008D  
S29AL008D_00A3 June 16, 2005