MBM29LV400TC Fujitsu Microelectronics, Inc., MBM29LV400TC Datasheet - Page 18

• Manufacturer Part Number: MBM29LV400TC
• Description: 4m 512k X 8/256k X 16 Bit
• Manufacturer: Fujitsu Microelectronics, Inc.

18
MBM29LV400TC
SPA : Sector address to be protected. Set sector address (SA) and (A
SD : Sector protection verify data. Output 01H at protected sector addresses and output 00H at unprotected
*1 This command is valid while Fast Mode.
*2 This command is valid while RESET= V
*3 This data " 00H" is also acceptable.
Command Definitions
Read/Reset Command
Set to
Fast Mode
Fast Program
*1
Reset from
Fast Mode *1
Extended
Sector
Protect *2
Device operations are selected by writing specific address and data sequences into the command register.
Writing incorrect address and data values or writing them in the improper sequence will reset the devices to the
read mode. Table 7 defines the valid register command sequences. Note that the Erase Suspend (B0H) and
Erase Resume (30H) commands are valid only while the Sector Erase operation is in progress. Moreover both
Read/Reset commands are functionally equivalent, resetting the device to the read mode. Please note that
commands are always written at DQ
In order to return from Autoselect mode or Exceeded Timing Limits (DQ
operation is initiated by writing the Read/Reset command sequence into the command register. Microprocessor
read cycles retrieve array data from the memory. The devices remain enabled for reads until the command
register contents are altered.
The devices will automatically power-up in the read/reset state. In this case, a command sequence is not required
to read data. Standard microprocessor read cycles will retrieve array data. This default value ensures that no
spurious alteration of the memory content occurs during the power transition. Refer to the AC Read
Characteristics and Waveforms for the specific timing parameters.
Command
Sequence
sector addresses.
Word
Word
Word
Word
Byte
Byte
Byte
Byte
Table 8
Cycles
Req'd
Write
Bus
3
2
2
4
MBM29LV400TC/BC Extended Command Definitions
-70/-90/-12
AAAH
XXXH
XXXH
XXXH
XXXH
XXXH
555H
Addr
Write Cycle
First Bus
0
to DQ
IH
.
Data
AAH
A0H
90H
60H
7
/MBM29LV400BC
and DQ
XXXH
XXXH
2AAH
Addr
555H
SPA
8
Second Bus
PA
Write Cycle
to DQ
15
F0H *3
bits are ignored.
Data
55H
60H
PD
6
, A
5
1
, A
= 1) to read/reset mode, the read/reset
AAAH
Addr
555H
SPA
Write Cycle
—
—
0
Third Bus
) = (0, 1, 0).
-70/-90/-12
Data
20H
40H
—
—
Addr
SPA
Read Cycle
—
—
—
Fourth Bus
Data
SD
—
—
—