參數(shù)資料
型號： MBM29DL640E90TR
廠商： FUJITSU LTD
元件分類： DRAM
英文描述： 64 M (8 M X 8/4 M X 16) BIT Dual Operation
中文描述： 4M X 16 FLASH 3V PROM, 90 ns, PDSO48
封裝： PLASTIC, REVERSE, TSOP1-48
文件頁數(shù)： 26/71頁
文件大?。?/td> 913K
代理商： MBM29DL640E90TR
MBM29DL640E
80/90/12
26
Sector Group Protection
The device features hardware sector group protection. This feature will disable both program and erase opera-
tions in any combination of forty eight sector groups of memory. (See Table 7) . The user‘s side can use the
sector group protection using programming equipment. The device is shipped with all sector groups that are
unprotected.
To activate this mode, the programming equipment must force V
ID
on address pin A
9
and control pin OE, CE
=
V
IL
and A
6
=
A
3
=
A
2
=
A
0
=
V
IL
, A
1
=
V
IH
. The sector group addresses (A
21
, A
20
, A
19
, A
18
, A
17
, A
16
, A
15
, A
14
, A
13
and
A
12
) should be set to the sector to be protected. Tables 6.1 to 6.4 define the sector address for each of the one
hundred forty-two (142) individual sectors, and Table 7 defines the sector group address for each of the forty
eight (48) 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 Figures 18 and 26 for sector group protection waveforms and algorithms.
To verify programming of the protection circuitry, the programming equipment must force V
ID
on address pin A
9
with CE and OE at V
IL
and WE at V
IH
. Scanning the sector group addresses (A
21
, A
20
, A
19
, A
18
, A
17
, A
16
, A
15
, A
14
,
A
13
and A
12
) while (A
6
, A
3
, A
2
, A
1
, A
0
)
=
(0, 0, 0, 1, 0) will produce a logical “1” code at device output DQ
0
for a
protected sector. Otherwise the device will produce “0” for unprotected sectors. In this mode, the lower order
addresses, except for A
0
, A
1
, A
2
, A
3
and A
6
are DON’T CARES. Address locations with A
1
=
V
IL
are reserved for
Autoselect manufacturer and device codes. A
-1
requires applying to V
IL
on byte mode.
Whether the sector group is protected in the system can be determined by writing an Autoselect command.
Performing a read operation at the address location (BA) XX02h, where the higher order addresses (A
21
, A
20
,
A
19
, A
18
, A
17
, A
16
, A
15
, A
14
, A
13
, and A
12
) are the desired sector group address, will produce a logical “1” at DQ
0
for a protected sector group. Note that the bank addresses (A
21
, A
20
, A
19
) must be pointing to a specific bank
during the third write bus cycle of the Autoselect command. Then the Autoselect data can be read from that
bank while array data can still be read from the other bank. To read Autoselect data from the other bank, it must
be reset to read mode and then write the Autoselect command to the other bank. See Tables 5.1 and 5.2 for
Autoselect codes.
Temporary Sector Group Unprotection
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
ID
) . During
this mode, formerly protected sector groups can be programmed or erased by selecting the sector group ad-
dresses. Once the V
ID
is taken away from the RESET pin, all the previously protected sector groups will be
protected again. Refer to Figures 19 and 27.
Extended Sector Group Protection
In addition to normal sector group protection, the device has Extended Sector Group Protection as extended
function. This function enables protection of the sector group by forcing V
ID
on RESET pin and writes a command
sequence. Unlike conventional procedures, it is not necessary to force V
ID
and control timing for control pins.
The only RESET pin requires V
ID
for sector group protection in this mode. The extended sector group protection
requires V
ID
on RESET pin. With this condition the operation is initiated by writing the set-up command (60h) in
the command register. Then the sector group addresses pins (A
21
, A
20
, A
19
, A
18
, A
17
, A
16
, A
15
, A
14
, A
13
and A
12
)
and (A
6
, A
3
, A
2
, A
1
, A
0
)
=
(0, 0, 0, 1, 0) should be set to the sector group to be protected (setting V
IL
for the other
addresses pins is recommended) , and an extended sector group protection command (60h) should be written.
A sector group is typically protected in 250
μ
s. To verify programming of the protection circuitry, the sector group
addresses pins (A
21
, A
20
, A
19
, A
18
, A
17
, A
16
, A
15
, A
14
, A
13
and A
12
) and (A
6
, A
3
, A
2
, A
1
, A
0
)
=
(0, 0, 0, 1, 0) should
be set a command (40h) should be written. Following the command write, a logical “1” at device output DQ
0
will
produce a protected sector in the read operation. If the output is logical “0”, write the extended sector group
protection command (60h) again. To terminate the operation, it is necessary to set RESET pin to V
IH
. (Refer to
Figures 20 and 28.)
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