參數(shù)資料
型號(hào)： AM29LV320DB40WMC
廠商： Advanced Micro Devices, Inc.
英文描述： 32 Megabit (4 M x 8-Bit/2 M x 16-Bit) CMOS 3.0 Volt-only, Boot Sector Flash Memory
中文描述： 32兆位（4個(gè)M × 8位/ 2米x 16位），3.0伏的CMOS只，引導(dǎo)扇區(qū)閃存
文件頁(yè)數(shù)： 27/57頁(yè)
文件大?。?/td> 636K
代理商： AM29LV320DB40WMC
December 14, 2005
Am29LV320D
25
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 14 on page 29 defines the valid
register command sequences.
Note that writing incor-
rect address and data values or writing them in the im-
proper sequence may place the device in an unknown
state. A reset command is required to return the de-
vice to normal operation.
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 “Erase Suspend/Erase Resume Com-
mands” on page 28 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” on
page 11 for more information. The
Read-Only Opera-
tions
table provides the read parameters, and
Figure
14, on page 38
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 which the
system was writing to the read mode. 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
which the system was writing to the read mode. If the
program command sequence is written to a sector that
is in the Erase Suspend mode, writing the reset
command returns the device to the erase-sus-
pend-read mode. Once programming begins, 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).
Autoselect Command Sequence
The autoselect command sequence allows the host
system to read several identifier codes at specific ad-
dresses:
Table 13.
Autoselect Codes
Table 14 on page 29 shows the address and data re-
quirements. This method is an alternative to that
shown in Table 6 on page 16, which is intended for
PROM programmers and requires V
ID
on address pin
A9. The autoselect command sequence may be writ-
ten to an address within sector that is either in the read
or erase-suspend-read mode. The autoselect com-
mand may not be written while the device 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 Secured Silicon Sector/Exit Secured
Silicon Sector Command Sequence
The Secured Silicon sector provides a secured data
area containing a random, sixteen-byte electronic se-
rial number (ESN). The system can access the Se-
cured Silicon sector by issuing the three-cycle Enter
Secured Silicon sector command sequence. The de-
vice continues to access the Secured Silicon sector
until the system issues the four-cycle Exit Secured Sil-
Identifier Code
Address
Manufacturer ID
00h
Device ID
01h
Secured Silicon Sector
Factory Protect
03h
Sector Group Protect Verify
(SA)02h
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AM29LV320DB40WMD 32 Megabit (4 M x 8-Bit/2 M x 16-Bit) CMOS 3.0 Volt-only, Boot Sector Flash Memory
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