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AM29F002T-90ECB

AM29F002T-90ECB首页预览图
型号: AM29F002T-90ECB
PDF文件:
  • AM29F002T-90ECB PDF文件
  • AM29F002T-90ECB PDF在线浏览
功能描述: 2 Megabit (256 K x 8-Bit) CMOS 5.0 Volt-only Boot Sector Flash Memory
PDF文件大小: 436.41 Kbytes
PDF页数: 共37页
制造商: AMD[Advanced Micro Devices]
制造商LOGO: AMD[Advanced Micro Devices] LOGO
制造商网址: http://www.amd.com
捡单宝AM29F002T-90ECB
PDF页面索引
120%
14 Am29F002/Am29F002N
PRELIMINARY
Erase Suspend/Erase Resume Commands
The Erase Suspend c ommand allo ws the s ystem to in-
terrupt a sector erase operation and then read data
from, or program data to, any sector not selected for
erasure. This command is valid only during the sector
erase operation, including the 50 µs time-out period
during the sector erase command sequence. The
Erase Suspend command is ignored if written during
the chip erase operation or Embedded Program algo-
rithm. Writing the Erase Suspend command during the
Sector Erase time-out immediately terminates the
time-out period and s uspends t he er ase oper at ion. Ad-
dresses are “don’t-cares” when writing the Erase Sus-
pend command.
When the Erase Suspend command is written during a
sector erase oper ation, the de vice requires a maximum
of 20 µs to suspend the erase operation. However,
when the Erase Suspend command is written during
the sector erase time-out, the device immediately ter-
minates the time-out period and suspends the erase
operation.
After the erase operation has been suspended, the
system can read array data from or program data to
any sector not selected f or eras ure. (The de vice “erase
suspends” all sectors selected for erasure.) Normal
read and write timings and command definitions apply.
Reading at any address within erase-suspended sec-
tors produces status data on DQ7–DQ0. The system
can use DQ7, or DQ6 and DQ2 together, to determine
if a sector is actively erasing or is erase-suspended.
See “Write Operation Status” for information on these
status bits.
After an erase-suspended program operation is com-
plete, the system c an once again r ead arra y d ata within
non-suspended sectors. The system can determine
the status of the program operation using the DQ7 or
DQ6 status bits, just as in the standard program oper-
ation. See “Write Operation Status” for more informa-
tion.
The system may also write the autoselect command
sequence when the device is in the Erase Suspend
mode. The device allows reading autoselect codes
even at addresses within erasing sectors, since the
codes are not stored in the memory array. When the
device exits the autoselect mode, the device reverts to
the Erase Suspend mode, and is ready for another
valid operation. See “Autoselect Command Sequence”
for more information.
The system must write the Erase Resume command
(address bits are “don’t care”) to exit the erase suspend
mode and continue the s ector erase oper ati on. Further
writes of the Resume command are ignored. Another
Erase Suspend command can be written after the de-
vice has resumed erasing.
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