MBM29PL3200BE Fujitsu Microelectronics, Inc., MBM29PL3200BE Datasheet - Page 20

• Manufacturer Part Number: MBM29PL3200BE
• Description: Page Mode Flash Memory 32 M 2 M X 16/1 M X 32 Bit
• Manufacturer: Fujitsu Microelectronics, Inc.

20
MBM29PL3200TE/BE
Write
Sector Protection
Temporary Sector Unprotection
To activate this mode, the programming equipment must force V
then be sequenced from the device outputs by toggling address A
DON’T CAREs except A
The manufacturer and device codes may also be read via the command register, for instance when the device
is erased or programmed in a system without access to high voltage on the A
illustrated in Table 11. (Refer to Autoselect Command section.)
A read cycle from address 00h returns the manufacturer’s code (Fujitsu
0Eh to 0Fh returns the device code. (See Tables 5.1 to 5.4.)
In order to determine which sectors are write protected, A
addresses; if the selected sector is protected, a logical ‘1’ will be output on DQ
The device erasure and programming are accomplished via the command register. The contents of the register
serve as inputs to the internal state machine. The state machine outputs dictate the function of the device.
The command register itself does not occupy any addressable memory location. The register is a latch used to
store the commands, along with the address and data information needed to execute the command. The com-
mand register is written by bringing WE to V
falling edge of WE or CE, whichever happens later, while data is latched on the rising edge of WE or CE,
whichever happens first. Standard microprocessor write timings are used.
Refer to AC Write Characteristics and the Erase/Programming Waveforms for specific timing parameters.
The device features hardware sector protection. This feature will disable both program and erase operations in
any number of sectors (0 through 18). The sector protection feature is enabled using programming equipment
at the user’s site. The device is shipped with all sectors unprotected.
To activate this mode, the programming equipment must force V
V
set to the sector to be protected. Tables 7 and 8 define the sector address for each of the nineteen (19) individual
sectors. Programming of the protection circuitry begins on the falling edge of the WE pulse and is terminated
with the rising edge of the same. Sector addresses must be held constant during the WE pulse. See Figures 15
and 21 for sector protection waveforms and algorithms.
To verify programming of the protection circuitry, the programming equipment must force V
with CE and OE at V
while (A
Otherwise the device will read 00h for an unprotected sector. In this mode, the lower order address, except for
A
device codes. A
It is also possible to determine if a sector is protected in the system by writing an Autoselect command. Performing
a read operation at the address location XX02h, where the higher order address pins (A
A
5.1 to 5.4 for Autoselect codes.
This feature allows temporary unprotection of previously protected sectors of the device in order to change data.
The Sector Unprotection mode is activated by the command register. In this mode, formerly protected sectors
can be programmed or erased by selecting the sector addresses. Once the mode is taken away using the
command register, all previously protected sectors will be protected again. (See Figure 22.)
IL
0
13
, A
, A
and A
1
6
and A
6
A
, A
12
3
) represents the sector address will produce a logical “1” at DQ
3
6
, A
A
are DON’T CAREs. Address locations with A
2
2
-1
, A
requires to V
A
1
0
, A
IL
0
and WE at V
V
)
6
IL
, A
, A
(0, 0, 0, 1, 0) will produce a logical “1” at device output DQ
3
1
, A
IL
2
V
, A
in word mode.
IH
. The sector address pins (A
1
, and A
IH
. Scanning the sector addresses (A
0
70/90
IL
(A
, while CE is at V
-1
). (See Tables 2 and 3.)
1
1
must be at V
V
IL
19
IL
ID
and OE is at V
ID
, A
are reserved for Autoselect manufacturer and
on address pin A
on address pin A
18
0
, A
and A
17
19
, A
04h). A read cycle from address 01h,
, A
IH
0
1
16
for a protected sector. See Tables
from V
while running through the sector
9
18
, A
IH
pin. The command sequence is
, A
0
. Addresses are latched on the
15
(DQ
, A
17
9
. Three identifier words may
, A
IL
9
14
0
and control pin OE, CE
to V
, A
16
19
0
, A
1).
for a protected sector.
, A
13
IH
, and A
15
ID
18
. All addresses are
, A
, A
on address pin A
14
17
, A
, A
12
) should be
13
16
, and A
, A
15
, A
12
14
9
)
,