參數(shù)資料
型號(hào)： S29AL016D90BFI023
廠商： SPANSION LLC
元件分類： DRAM
英文描述： 16 MEGABIT CMOS 3.0 VOLT ONLY BOOT SECTOR FLASH MEMORY
中文描述： 1M X 16 FLASH 3V PROM, 90 ns, PBGA48
封裝： 8.15 X 6.15 MM, LEAD FREE, FBGA-48
文件頁數(shù)： 22/58頁
文件大?。?/td> 1037K
代理商： S29AL016D90BFI023
22
S29AL016D
S29AL016D_00_A2 December 17, 2004
P r e l i m i n a r y
Command Definitions
Writing specific address and data commands or sequences into the command
register initiates device operations.
Table 9
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.
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 in the
AC Characteristics
section.
Reading Array Data
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.
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 Sus-
pend mode, the system may once again read array data with the same exception.
See
Erase Suspend/Erase Resume Commands
for more information on this mode.
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
section, next.
See also
Requirements for Reading Array Data
in the
Device Bus Operations
sec-
tion for more information. The
Read Operations
table provides the read
parameters, and
Figure 13
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).
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