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參數(shù)資料
| 型號(hào)： | AM29LV320DB120WME |
| 廠商： | SPANSION LLC |
| 元件分類： | PROM |
| 英文描述： | 2M X 16 FLASH 3V PROM, 120 ns, PBGA48 |
| 封裝： | 6 X 12 MM, 0.80 MM PITCH, FBGA-48 |
| 文件頁數(shù)： | 18/53頁 |
| 文件大小： | 1008K |
| 代理商： | AM29LV320DB120WME |
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July 30, 2002
Am29LV320D
25
COMMAND DEFINITIONS
Writing specific address and data commands or se-
quences into the command register initiates device op-
erations. Table 14 defines the valid register command
sequences. Writing incorrect address and data val-
ues 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 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
whic h t he s y s t em c an r ead da t a f r om 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
operation, or if the device is in the autoselect mode.
See the next section, Reset Command, for more infor-
mation.
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 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
com mand returns the device t o the er as e-sus-
pend-read mode. Once programming begins, how-
ever, 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 shows the address and data requirements.
This method is an alternative to that shown in Table 6,
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 within
sector that is either in the read or erase-suspend-read
mode. The autoselect command 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 SecSi
TM Sector/Exit SecSi Sector
Command Sequence
The SecSi Sector region provides a secured data area
containing a random, sixteen-byte 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
Identifier Code
Address
Manufacturer ID
00h
Device ID
01h
SecSi Sector Factory Protect
03h
Sector Group Protect Verify
(SA)02h
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