MBM29LV080A-12PTN データシートの表示（PDF） - Fujitsu

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コンポーネント説明

メーカー

MBM29LV080A-12PTN

8M (1M x 8) BIT

Fujitsu 

MBM29LV080A-70/-90/-12

Extended Command

(1) Fast Mode

MBM29LV080A has Fast Mode function. This mode dispenses with the initial two unlock 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 normal 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 23

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 Setup command (A0H) and data write cycles (PA/PD). (Refer to the

Figure 23 Extended algorithm.)

(3) Extended Sector Protection

In addition to normal sector protection, the MBM29LV080A has Extended Sector Protection as extended function.

This function enable to protect sector by forcing VID on RESET pin and write a command 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 initated by writing the Setup command (60H) into the command register. Then, the

sector addresses pins (A19, A18, A17, and A16) and (A10, A6, A1, A0) = (0, 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 250 µs. To verify programming of the protection cicuitry, the sector

addresses pins (A19, A18, A17, and A16) and (A10, A6, A1, A0) = (0, 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 opetation, it is necessary to set RESET pin to VIH.

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