MBM29PL12LM Fujitsu Media Devices, MBM29PL12LM Datasheet - Page 32

• Manufacturer Part Number: MBM29PL12LM
• Description: FLASH MEMORY 128 M (16M x 8/8M x 16) BIT
• Manufacturer: Fujitsu Media Devices

32
MBM29PL12LM
Extended Sector Group Protection
Query Command (CFI : Common Flash Memory Interface)
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
sequence. Unlike conventional procedures, it is not necessary to force V
The only RESET pin requires V
requires V
into the command register. Then the sector group addresses pins (A
(A
pins is recommended), and write extended sector group protection command (60h). A sector group is typically
protected in 250 µs. To verify programming of the protection circuitry, the sector group addresses pins (A
A
at device output DQ
the extended sector group protection command (60h) again. To terminate the operation, set RESET pin to V
(Refer to the “Extended Sector Group Protection Timing Diagram” in ■TIMING DIAGRAM and “Extended Sector
Group Protection Algorithm” in ■FLOW CHART.)
The CFI (Common Flash Memory Interface) specification outlines device and host system software interrogation
handshake which allows specific vendor-specified software algorithms to be used for entire families of devices.
This allows device-independent, JEDEC ID-independent, and forward-and backward-compatible software sup-
port for the specified flash device families. Refer to CFI specification in detail.
The operation is initiated by writing the query command (98h) into the command register. Following the command
write, a read cycle from specific address retrieves device information. Please note that output data of upper byte
(DQ
command sequence into the register. (See “Common Flash Memory Interface Code” in ■DEVICE BUS OPER-
ATION.)
2
6
, A
, A
15
1
3
, A
, A
to DQ
0
2
) = (0, 0, 0, 1, 0) should be set and write a command (40h). Following the command write, a logical “1”
, A
ID
on RESET pin. With this condition, the operation is initiated by writing the set-up command (60h)
1
8
, A
) is “0”. Refer to the CFI code table. To terminate operation, it is necessary to write the Reset
0
) = (0, 0, 0, 1, 0) should be set to the sector group to be protected (set V
0
will produce for protected sector in the read operation. If the output data is logical “0”, write
ID
10
for sector group protection in this mode. The extended sector group protection
22
, A
ID
on RESET pin and writes a command
ID
21
, A
and control timing for control pins.
20
, A
19
, A
IL
18
for the other addresses
, A
17,
A
16
and A
15
) and
6
, A
IH
3
,
.