MBM29LV320TE Fujitsu Microelectronics, Inc., MBM29LV320TE Datasheet - Page 24

• Manufacturer Part Number: MBM29LV320TE
• Description: 32 M 4 M X 8/2 M X 16 Bit
• Manufacturer: Fujitsu Microelectronics, Inc.

24
MBM29LV320TE/BE
6.
7.
8.
Word 0 (A
identifier code. Word 3 (A
in “MBM29LV320TE/BE Sector Group Protection Verify Autoselect Codes Table”and “Expanded Autoselect Code
Table“ ( DEVICE BUS OPERATIONS) . In order to read the proper device codes when executing the autoselect,
A
panded Autoselect Code Table“ in DEVICE BUS OPERATIONS.)
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.
See “Read Only Operation Characteristics” in AC CHARACTERISTICS for specific timing parameters.
The device features hardware sector group protection. This feature will disable both program and erase opera-
tions in any combination of twenty five sector groups of memory. (See “Sector Group Address Tables
(MBM29LV320TE/BE)” in FLEXIBLE SECTOR-ERASE ARCHITECTURE). The sector group protection feature
is enabled using programming equipment at the user’s site. The device is shipped with all sector groups unpro-
tected.
To activate this mode, the programming equipment must force V
V
A
individual sectors, and “Sector Group Address Tables (MBM29LV320TE/BE)” in
ARCHITECTURE define the sector group address for each of the twenty five (25) individual group 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 group addresses must be held constant during the WE pulse. See “14. Sector
Group Protection Timing Diagram” in TIMING DIAGRAM and “5. Sector Group Protection Algorithm” in FLOW
CHART for sector group protection waveforms and algorithm.
To verify programming of the protection circuitry, the programming equipment must force V
with CE and OE at V
and A
Otherwise the device will produce “0” for unprotected sector. In this mode, the lower order addresses, except
for A
and device codes. A
It is also possible to determine if a sector group is protected in the system by writing an Autoselect command.
Performing a read operation at the address location XX02h, where the higher order addresses (A
A
sector group. See “MBM29LV320TE/BE Sector Group Protection Verify Autoselect Codes Table” and “Expanded
Autoselect Code Table” in
This feature allows temporary unprotection of previously protected sector groups of the device in order to change
data. The Sector Group Unprotection mode is activated by setting the RESET pin to high voltage (V
this mode, formerly protected sector groups can be programmed or erased by selecting the sector group ad-
dresses. Once the V
protected again. See “15. Temporary Sector Group Unprotection Timing Diagram” in TIMING DIAGRAM and
“6. Temporary Sector Group Unprotection Algorithm” in FLOW CHART.
Write
Sector Group Protection
Temporary Sector Group Unprotection
1
ID
13
16
FLEXIBLE SECTOR-ERASE ARCHITECTURE define the sector address for each of the seventy one (71)
must be V
, and A
, A
0
11.5 V) , CE
, A
15
12
, A
) while (A
1
, and A
0
14
12
, A
) should be set to the sector to be protected. “Sector Address Tables (MBM29LV320TE/BE)” in
V
IL
13
IL
. (See “MBM29LV320TE/BE Sector Group Protection Verify Autoselect Codes Table” and “Ex-
) represents the manufacturer’s code (Fujitsu 04h) and word 1 (A
, and A
6
6
, A
are DON’T CARES. Address locations with A
1
-1
V
IL
, A
ID
IL
requires to apply to V
and WE at V
12
is taken away from the RESET pin, all the previously protected sector groups will be
0
and A
)
) are the desired sector group address will produce a logical “1” at DQ
1
A
DEVICE BUS OPERATIONS for Autoselect codes.
(0, 1, 0) will produce a logical “1” code at device output DQ
6
0
A
V
0
IH
IH
) represents the extended device code. These three bytes/words are given
. Scanning the sector group addresses (A
V
IL
80/90/10
, A
1
IL
IL
, while CE is at V
on byte mode.
V
IH
. The sector group addresses (A
IL
ID
1
and OE is at V
on address pin A
V
IL
are reserved for Autoselect manufacturer
IH
20
. Addresses are latched on the
, A
9
FLEXIBLE SECTOR-ERASE
0
and control pin OE, (suggest
20
19
, A
, A
V
IH
19
18
0
) represents the device
, A
, A
for a protected sector.
ID
18
17
, A
on address pin A
, A
0
17
16
20
for a protected
, A
, A
, A
16
ID
15
19
, A
) . During
, A
, A
15
14
18
, A
, A
, A
14
13
17
9
,
,
,