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AM29LV641ML110EI 데이터시트(PDF) 25 Page - Advanced Micro Devices

부품명 AM29LV641ML110EI
상세설명  64 Megabit (4 M x 16-Bit) MirrorBit??3.0 Volt-only Uniform Sector Flash Memory with VersatileI/O??Control
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제조업체  AMD [Advanced Micro Devices]
홈페이지  http://www.amd.com
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December 21, 2005
Am29LV641MH/L
23
DA TA SH EET
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 14 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).
Enter SecSi Sector/Exit SecSi Sector
Command Sequence
The SecSi Sector region provides a secured data area
containing an 8-word random Electronic Serial Num-
ber (ESN). The system can access the SecSi Sector
region by issuing the three-cycle Enter SecSi Sector
command sequence. The device continues to access
the SecSi Sector region until the system issues the
four-cycle Exit SecSi Sector command sequence. The
Exit SecSi Sector command sequence returns the de-
vice to normal operation. Table 10 shows the address
and data requirements for both command sequences.
See also “SecSi (Secured Silicon) Sector Flash
Memory Region” for further information. Note that the
ACC function and unlock bypass modes are not avail-
able when the SecSi Sector is enabled.
Word Program Command Sequence
Programming is a four-bus-cycle operation. The pro-
gram command sequence is initiated by writing two
unlock write cycles, followed by the program set-up
command. The program address and data are written
next, which in turn initiate the Embedded Program al-
gorithm. The system is not required to provide further
Identifier Code
A7:A0
Manufacturer ID
00h
Device ID, Cycle 1
01h
Device ID, Cycle 2
0Eh
Device ID, Cycle 3
0Fh
SecSi Sector Factory Protect
03h
Sector Protect Verify
(SA)02h


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