AM29LV320MB SPANSION [SPANSION], AM29LV320MB Datasheet - Page 28

• Manufacturer Part Number: AM29LV320MB
• Manufacturer: SPANSION [SPANSION]

w h i c h t h e s y s t e m c a n r e a d d a t a f r o m a n y
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
Commands
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,
tion.
See also
Device Bus Operations
The
rameters, and
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.
26
Read-Only Operations
Requirements for Reading Array Data
section for more information.
Figure 14
Reset
Erase Suspend/Erase Resume
Command, for more informa-
section for more information.
shows the timing diagram.
table provides the read pa-
D A T A
Am29LV320MT/B
in the
S H E E T
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
ments. This method is an alternative to that shown in
Table
and requires V
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 Secured Silicon Sector/Exit Secured
Silicon Sector Command Sequence
The Secured Silicon Sector region provides a secured
data area containing an 8-word/16-byte random Elec-
tronic Serial Number (ESN). The system can access
the Secured Silicon Sector region by issuing the
three-cycle Enter Secured Silicon Sector command
sequence. The device continues to access the Se-
cured Silicon Sector region until the system issues the
four-cycle Exit Secured Silicon Sector command se-
quence. The Exit Secured Silicon Sector command
sequence returns the device to normal operation. Ta-
bles
ments for both command sequences. See also
Silicon Sector Flash Memory Region
mation. Note that the ACC function and unlock bypass
modes are not available when the Secured Silicon
Sector is enabled.
Secured Silicon Sector Factory
12
Sector Protect Verify
4, which is intended for PROM programmers
Device ID, Cycle 1
Device ID, Cycle 2
Device ID, Cycle 3
12
Manufacturer ID
Identifier Code
and
and
Protect
13
13
ID
show the address and data require-
on address pin A9. The autoselect
show the address and data require-
26518C3 January 31, 2007
(SA)02h
A7:A0
(x16)
01h
0Eh
0Fh
00h
03h
for further infor-
(SA)04h
A6:A-1
(x8)
1Ch
1Eh
00h
02h
06h
Secured