MBM29LV160TE Fujitsu Microelectronics, Inc., MBM29LV160TE Datasheet - Page 15

• Manufacturer Part Number: MBM29LV160TE
• Description: 16m 2m X 8/1m X 16 Bit
• Manufacturer: Fujitsu Microelectronics, Inc.

• Write
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.
• Sector Protection
The MBM29LV160TE/BE features hardware sector protection. This feature will disable both program and erase
operations in any number of sectors (0 through 34). 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
the sector to be protected. Tables 5 and 6 define the sector address for each of the thirty five (35) 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 17
and 24 for sector protection waveforms and algorithm.
To verify programming of the protection circuitry, the programming equipment must force V
with CE and OE at V
while (A
device will read 00H for an unprotected sector. In this mode, the lower order addresses, except for A
A
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 addresses pins (A
A
Tables 4.1 and 4.2 for Autoselect codes.
• Temporary Sector Unprotection
This feature allows temporary unprotection of previously protected sectors of the MBM29LV160TE/BE devices
in order to change data. The Sector Unprotection mode is activated by setting the RESET pin to high voltage
(V
dresses. Once the V
again. (See Figures 18 and 25.)
IL
6
14
ID
, A
are DON’T CARES. Address locations with A
, A
). During this mode, formerly protected sectors can be programmed or erased by selecting the sector ad-
0
13
= A
, and A
6
, A
-1
6
requires to V
1
= V
, A
0
12
IL
) = (0, 1, 0) will produce a logical “1” at device output DQ
, A
) represents the sector address will produce a logical “1” at DQ
1
= V
ID
IL
is taken away from the RESET pin, all the previously protected sectors will be protected
and WE at V
IH
IL
. The sector addresses pins (A
in byte mode.
IH
. Scanning the sector addresses (A
IL
, while CE is at V
1
= V
MBM29LV160TE/BE
IL
19
are reserved for Autoselect manufacturer and device
, A
18
IL
, A
and OE is at V
ID
17
on address pin A
, A
16
, A
0
19
15
for a protected sector. Otherwise the
, A
, A
18
14
IH
, A
. Addresses are latched on the
, A
0
17
13
for a protected sector. See
, A
9
, and A
and control pin OE, CE =
16
, A
ID
15
19
12
, A
on address pin A
, A
) should be set to
14
18
, A
, A
-70/90/12
13
17
, and A
0
, A
, A
16
1
, and
, A
12
15
9
)
,
15