MBM29LV400TC-55 Datasheet, PDF (20/58 Pages) SPANSION – FLASH MEMORY CMOS 4M (512K X 8/256K X 16) BIT

MBM29LV400TC-55/70/90/MBM29LV400BC-55/70/90
register. In this mode, the required bus cycle for programming is two cycles instead of four bus cycles in
standard program command. (Do not write erase command in this mode.) The read operation is also executed
after exiting this mode. To exit this mode, it is necessary to write Fast Mode Reset command into the command
register. (Refer to “8. Embedded Program^TM Algorithm for Fast Mode” in sFLOW CHART Extended
algorithm.) The VCC active current is required even CE = VIH during Fast Mode.
(2) Fast Programming
During Fast Mode, the programming can be executed with two bus cycles operation. The Embedded Program
Algorithm is executed by writing program set-up command (A0h) and data write cycles (PA/PD). (Refer to
“8. Embedded Program^TM Algorithm for Fast Mode” in sFLOW CHART Extended algorithm.)
(3) Extended Sector Protection
In addition to normal sector protection, the MBM29LV400TC/BC has Extended Sector Protection as extended
function. This function enable to protect sector by forcing VID on RESET pin and write a commnad sequence.
Unlike conventional procedure, it is not necessary to force VID and control timing for control pins. The only
RESET pin requires VID for sector protection in this mode. The extended sector protect requires VID on RESET
pin. With this condition, the operation is initiated by writing the set-up command (60h) into the command
register. Then, the sector addresses pins (A17, A16, A15, A14, A13 and A12) and (A6, A1, A0) = (0, 1, 0) should
be set to the sector to be protected (recommend to set VIL for the other addresses pins), and write extended
sector protect command (60h). A sector is typically protected in 150 µs. To verify programming of the
protection circuitry, the sector addresses pins (A17, A16, A15, A14, A13 and A12) and (A6, A1, A0) = (0, 1, 0) should
be set and write a command (40h). Following the command write, a logical “1” at device output DQ0 will
produce for protected sector in the read operation. If the output data is logical “0”, please repeat to write
extended sector protect command (60h) again. To terminate the operation, it is necessary to set RESET pin
to VIH.
8. Write Operation Status
Status
Hardware Sequence Flags
DQ7
Embedded Program Algorithm
DQ7
Embedded Erase Algorithm
0
In
Progress
Erase Suspend Read
(Erase Suspended Sector)
Erase
Suspende
d Mode
Erase Suspend Read
(Non-Erase Suspended Sector)
Erase Suspend Program
(Non-Erase Suspended Sector)
1
Data
DQ7
Embedded Program Algorithm
DQ7
Exceeded Embedded Erase Algorithm
0
Time
Limits
Erase
Suspende
d Mode
Erase Suspend Program
(Non-Erase Suspended Sector)
DQ7
DQ6
Toggle
Toggle
1
Data
Toggle
Toggle
Toggle
Toggle
DQ5
0
0
0
Data
0
1
1
1
*1:Successive reads from the erasing or erase-suspend sector cause DQ2 to toggle.
*2: Reading from non-erase suspend sector address indicates logic “1” at the DQ2 bit.
DQ3
0
1
0
Data
0
0
1
0
DQ2
1
Toggle*¹
Toggle
Data
1 *²
1
N/A
N/A
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