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AS29LV016JTRGR-55/IT 参数 Datasheet PDF下载

AS29LV016JTRGR-55/IT图片预览
型号: AS29LV016JTRGR-55/IT
PDF下载: 下载PDF文件 查看货源
内容描述: 16兆位( 2M ×8位/ 1M ×16位) CMOS 3.0伏只引导扇区闪存 [16 Megabit (2M x 8-Bit / 1M 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: 40 页 / 408 K
品牌: AUSTIN [ AUSTIN SEMICONDUCTOR ]
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COTS PEM  
BOOT SECTOR FLASH  
Austin Semiconductor, Inc.  
AS29LV016J  
Once erasure begins, however, the device ignores reset  
commands until the operation is complete.  
COMMAND DEFINITIONS  
Writing specific address and data commands or  
sequences into the command register initiates device  
operations. Table 9 on page 21 defines the valid register  
command sequences. Writing incorrect address and  
data values or writing them in the improper sequence  
resets the device to reading array data.  
The reset command may be written between the sequence  
cycles in a program command sequence before  
programming begins. This resets the device to reading  
array data (also applies to programming in Erase Suspend  
mode). Once programming begins, however, the device  
ignores reset commands until the operation is complete.  
All addresses are latched on the falling edge of WE# or  
CE#, whichever happens later. All data is latched on the  
rising edge of WE# or CE#, whichever happens first. Refer  
to the appropriate timing diagrams inAC Characteristics  
on page 29.  
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).  
READING ARRAY DATA  
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).  
The device is automatically set to reading array data after  
device power-up. No commands are required to retrieve  
data. The device is also ready to read array data after  
completing an Embedded Program or Embedded Erase  
algorithm.  
AUTOSELECT COMMAND SEQUENCE  
The autoselect command sequence allows the host  
system to access the manufacturer and devices codes,  
and determine whether or not a sector is protected. Table 9  
on page 21 shows the address and data requirements.  
This method is an alternative to that shown in Table 4 on  
page 11, which is intended for PROM programmers and  
requires VID on address bit A9.  
After the device accepts an Erase Suspend command,  
the device enters the Erase Suspend mode. The system  
can read array data using the standard read timings,  
except that if it reads at an address within erase-  
suspended sectors, the device outputs status data. After  
completing a programming operation in the Erase  
Suspend mode, the system may once again read array  
data with the same exception. See Erase Suspend/Erase  
Resume Commands on page 20 for more information on  
this mode.  
The autoselect command sequence is initiated by writing  
two unlock cycles, followed 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.  
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 Reset Command, next.  
A read cycle at address XX00h retrieves the manufacturer  
code. A read cycle at address XX01h returns the device  
code. Aread 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  
unprotected. Refer to Table 2 on page 9 and Table 3 on  
page 10 for valid sector addresses.  
See also Requirements for ReadingArray Data on page 7  
for more information. The Read Operations on page 29  
provides the read parameters, and Figure 12, on page 29  
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 system must write the reset command to exit the  
autoselect mode and return to reading array data.  
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.  
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.  
AS29LV016J  
Rev. 0.0 02/09  
17  
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