參數(shù)資料
型號(hào)： AM29LV640MH120EI
廠商： ADVANCED MICRO DEVICES INC
元件分類： PROM
英文描述： 64 Megabit (4 M x 16-Bit/8 M x 8-Bit) MirrorBit⑩ 3.0 Volt-only Uniform Sector Flash Memory with VersatileI/O⑩ Control
中文描述： 4M X 16 FLASH 3V PROM, 120 ns, PDSO56
封裝： MO-142, TSOP-56
文件頁(yè)數(shù)： 27/62頁(yè)
文件大小： 602K
代理商： AM29LV640MH120EI
December 14, 2005
Am29LV640MH/L
25
D A T A S H E E T
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
Tables
10
and
11
show the address requirements and
codes. This method is an alternative to that shown in
Table 3
, which is intended for PROM programmers
and requires V
ID
on address pin A9. The autoselect
command 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/16-byte random Electronic Serial
Number (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 is-
sues the four-cycle Exit SecSi Sector command se-
quence. The Exit SecSi Sector command sequence
returns the device to normal operation. Tables
10
and
11
show the address and data requirements for both
command sequences. See also “SecSi (Secured Sili-
con) Sector Flash Memory Region” for further informa-
tion.
Note that the ACC function and unlock bypass
modes are not available when the SecSi Sector is en-
abled.
Word/Byte 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
controls or timings. The device automatically provides
internally generated program pulses and verifies the
programmed cell margin. Tables
10
and
11
show the
address and data requirements for the word/byte pro-
gram command sequence, respectively.
Identifier Code
A7:A0
(x16)
00h
01h
0Eh
0Fh
03h
(SA)02h
A6:A-1
(x8)
00h
02h
1Ch
1Eh
06h
(SA)04h
Manufacturer ID
Device ID, Cycle 1
Device ID, Cycle 2
Device ID, Cycle 3
SecSi Sector Factory Protect
Sector Protect Verify
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