MBM29LV800BA-120PFTR 데이터 시트보기 (PDF) - Fujitsu

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MBM29LV800BA-120PFTR

CMOS 8M (1M × 8/512K × 16) BIT

Fujitsu 

MBM29LV800TA-70/-90/-12/MBM29LV800BA-70/-90/-12

Extended Command

(1) Fast Mode

MBM29LV800TA/BA has Fast Mode function. This mode dispenses with the initial two unclock cycles required

in the standard program command sequence by writing Fast Mode command into the command 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 the Figure 27 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

the Figure 27 Extended algorithm.)

(3) Extended Sector Protection

In addition to normal sector protection, the MBM29LV800TA/BA 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 (A18, 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 (A18, 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.

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