MBM29LV800TE Fujitsu Microelectronics, Inc., MBM29LV800TE Datasheet - Page 19

• Manufacturer Part Number: MBM29LV800TE
• Description: 8m 1m X 8/512 K X 16 Bit
• Manufacturer: Fujitsu Microelectronics, Inc.

18
MBM29LV800TE/BE
Extended Sector Protection
RESET
Hardware Reset
In addition to normal sector protection, the MBM29LV800TE/BE have Extended Sector Protection as extended
function. This function enables to protect sector by forcing V
Unlike conventional procedure, it is not necessary to force V
pin requires V
this condition the operation is initiated by writing the set-up command (60h) into the command register. Then
the sector addresses pins (A
protected (recommend to set V
(60h) . A sector is generally protected in 250 s. To verify programming of the protection circuitry, the sector
addresses pins (A
(40h) . Following the command write, a logical “1” at device output DQ
operation. If the output is logical “0”, repeat to write extended sector protect command (60h) again. To terminate
the operation, it is necessary to set RESET pin to V
“ FLOW CHART”) .
The MBM29LV800TE/BE devices may be reset by driving the RESET pin to V
requirement and has to be kept low (V
Any operation in the process of being executed is terminated and the internal state machine is reset to the read
mode “t
an additional t
mode for the duration of the pulse and all the data output pins will be tri-stated. If hardware reset occurs during
program or erase operation, the data at that particular location is corrupted. Note that the RY/BY output signal
should be ignored during the RESET pulse. See “RESET, RY/BY Timing Diagram” in “
for the timing diagram. Refer to Temporary Sector Unprotection for additional functionality.
If hardware reset occurs during Embedded Erase Algorithm, the erasing sector (s) cannot be used.
READY
” after the RESET pin goes low. Furthermore once the RESET pin goes high, the devices require
ID
RH
for sector protection in this mode. The extended sector protect requires V
before it will allow read access. When the RESET pin is low, the devices will be in the standby
18
, A
17
, A
16
, A
18
15
, A
IL
, A
17
for the other addresses pins) , and write extended sector protect command
14
, A
, A
16
13
IL
, A
) for at least “t
60/70/90
and A
15
, A
12
14
) and (A
, A
13
IH
and A
RP
(refer to “Extended Sector Protection Algorithm” in
6
” in order to properly reset the internal state machine.
, A
ID
1
12
, A
ID
and control timing for control pins. The only RESET
) and (A
on RESET pin and write a commnad sequence.
0
)
(0, 1, 0) should be set and write a command
0
6
, A
produces for protected sector in the read
1
, A
0
)
IL
. The RESET pin has pulse
(0, 1, 0) should be set to be
ID
on RESET pin. With
TIMING DIAGRAM”