參數(shù)資料
型號： AM29LV640MU120WHI
廠商： ADVANCED MICRO DEVICES INC
元件分類： PROM
英文描述： 64 Megabit (4 M x 16-Bit) MirrorBita?? 3.0 Volt-only Uniform Sector Flash Memory with VersatileI/Oa?? Control
中文描述： 4M X 16 FLASH 3V PROM, 120 ns, PBGA63
封裝： 12 X 11 MM, 0.80 MM PITCH, FBGA-63
文件頁數(shù)： 26/59頁
文件大?。?/td> 699K
代理商： AM29LV640MU120WHI
24
Am29LV640MU
25301C5 February1,2007
D A T A S H E E T
COMMAND DEFINITIONS
Writing specific address and data commands or se-
quences into the command register initiates device op-
erations.
Table 10
defines the valid register command
sequences.
Writing incorrect address and data values
or writing them in the improper sequence may place
the device in an unknown state.
A reset command is
then required to return 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
AC Characteristics
section for timing
diagrams.
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 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-read mode, after
which the system can read data from any
non-erase-suspended sector. After completing a pro-
gramming operation in the Erase Suspend mode, the
system may once again read array data with the same
exception. See the
Erase Suspend/Erase Resume
Commands
section for more information.
The system
must
issue the reset command to return
the device to the read (or erase-suspend-read) mode if
DQ5 goes high during an active program or erase op-
eration, or if the device is in the autoselect mode. See
the next section,
Reset Command
, for more informa-
tion.
See also
Requirements for Reading Array Data
in the
Device Bus Operations
section for more information.
The
Read-Only Operations
table provides the read pa-
rameters, and Figure 13 shows the timing diagram.
Reset Command
Writing the reset command resets the device to the
read or erase-suspend-read mode. Address bits are
don’t cares for this command.
The reset command may be written between the se-
quence cycles in an erase command sequence before
erasing begins. This resets the device to the read
mode. Once erasure begins, however, the device ig-
nores 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
the read mode. If the program command sequence is
written while the device is in the Erase Suspend mode,
writing the reset command returns the device to the
erase-suspend-read mode. Once programming be-
gins, however, the device ignores reset commands
until the operation is complete.
The reset command may be written between the se-
quence cycles in an autoselect command sequence.
Once in the autoselect mode, the reset command
must be written to return to the read mode. If the de-
vice entered the autoselect mode while in the Erase
Suspend mode, writing the reset command returns the
device to the erase-suspend-read mode.
If DQ5 goes high during a program or erase operation,
writing the reset command returns the device to the
read mode (or erase-suspend-read mode if the device
was in Erase Suspend).
Note that if DQ1 goes high during a Write Buffer Pro-
gramming operation, the system must write the
Write-to-Buffer-Abort Reset command sequence to
reset the device for the next operation.
Autoselect Command Sequence
The autoselect command sequence allows the host
system to read several identifier codes at specific ad-
dresses:
Note:
The device ID is read over three cycles. SA = Sector Address
Table 10
shows the address and data requirements.
This method is an alternative to that shown in
Table 3
,
which is intended for PROM programmers and re-
quires V
ID
on address pin A9. The autoselect com-
mand sequence may be written to an address that is
either in the read or erase-suspend-read mode. The
autoselect command may not be written while the de-
vice is actively programming or erasing.
The autoselect command sequence is initiated by first
writing two unlock cycles. This is followed by a third
write cycle that contains the autoselect command. The
device then enters the autoselect mode. The system
may read at any address any number of times without
initiating another autoselect command sequence.
The system must write the reset command to return to
the read mode (or erase-suspend-read mode if the de-
vice was previously in Erase Suspend).
Identifier Code
Manufacturer ID
Device ID, Cycle 1
Device ID, Cycle 2
Device ID, Cycle 3
A7:A0
00h
01h
0Eh
0Fh
03h
(SA)02h
Secured Silicon Sector Factory Protect
Sector Protect Verify
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