AM29LV640MB90REI Spansion Inc., AM29LV640MB90REI Datasheet - Page 30

• Manufacturer Part Number: AM29LV640MB90REI
• Manufacturer: Spansion Inc.

Specifications of AM29LV640MB90REI

• Cell Type: NOR
• Density: 64Mb
• Access Time (max): 90ns
• Interface Type: Parallel
• Boot Type: Bottom
• Address Bus: 23/22Bit
• Operating Supply Voltage (typ): 3.3V
• Operating Temp Range: -40C to 85C
• Package Type: TSOP
• Program/erase Volt (typ): 3 to 3.6V
• Sync/async: Asynchronous
• Operating Temperature Classification: Industrial
• Operating Supply Voltage (min): 3V
• Operating Supply Voltage (max): 3.6V
• Word Size: 8/16Bit
• Number Of Words: 8M/4M
• Supply Current: 20mA
• Mounting: Surface Mount
• Pin Count: 48
• Lead Free Status / Rohs Status: Not Compliant

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 can once again read array data with the same
exception. See
mands on page 35
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
page 11
tion. See the table,
for the read parameters, and
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 can 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 can 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 can 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
28
in
Requirements for Reading Array Data on
Device Bus Operations
Erase Suspend/Erase Resume Com-
Reset
for more information.
Read-Only Operations on page 45
Command, for more informa-
Figure 14
for more informa-
for the timing
D A T A
Am29LV640MT/B
S H E E T
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
ments. This method is an alternative to that shown in
Table
and requires V
command sequence can be written to an address that
is either in the read or erase-suspend-read mode. The
autoselect command cannot 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
can 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.
Secured Silicon Sector Factory Protect
12
4, which is intended for PROM programmers
12
Sector Protect Verify
and
Device ID, Cycle 1
Device ID, Cycle 2
Device ID, Cycle 3
Identifier Code
Manufacturer ID
and
13
13
ID
show the address and data require-
on address pin A9. The autoselect
show the address and data require-
26190C8 February 1, 2007
(SA)02h
A7:A0
(x16)
00h
01h
0Eh
0Fh
03h
for further infor-
(SA)04h
A6:A-1
Secured
(x8)
1Ch
1Eh
00h
02h
06h