MBM29SL160BD Просмотр технического описания (PDF) - Fujitsu

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MBM29SL160BD

FLASH MEMORY CMOS 16M (2M × 8/1M × 16) BIT

Fujitsu 

MBM29SL160TD-10/-12/MBM29SL160BD-10/-12

RESET

Hardware Reset

The MBM29SL160TD/BD devices may be reset by driving the RESET pin to VIL. The RESET pin has a pulse

requirement and has to be kept low (VIL) for at least “tRP” in order to properly reset the internal state machine.

Any operation in the process of being executed will be terminated and the internal state machine will be reset

to the read mode “tREADY” after the RESET pin is driven low. Furthermore, once the RESET pin goes high, the

devices require an additional “tRH” before it will allow read access. When the RESET pin is low, the devices will

be in the standby mode for the duration of the pulse and all the data output pins will be tri-stated. If a hardware

reset occurs during a program or erase operation, the data at that particular location will be corrupted. Please

note that the RY/BY output signal should be ignored during the RESET pulse. See Figure 12 for the timing

diagram. Refer to Temporary Sector Group Unprotection for additional functionality.

Boot Block Sector Protection

The Write Protection function provides a hardware method of protecting certain boot sectors without using VID.

This function is one of two provided by the WP/ACC pin.

If the system asserts VIL on the WP/ACC pin, the device disables program and erase functions in the two

“outermost” 8K byte boot sectors independently of whether those sectors were protected or unprotected using

the method described in “Sector Protection/Unprotection”. The two outermost 8K byte boot sectors are the two

sectors containing the lowest addresses in a bottom-boot-configured device, or the two sectors containing the

highest addresses in a top-boot-congfigured device.

(MBM29SL160TD: SA37 and SA38, MBM29SL160BD: SA0 and SA1)

If the system asserts VIH on the WP/ACC pin, the device reverts to whether the two outermost 8K byte boot

sectors were last set to be protected or unprotected. That is, sector protection or unprotection for these two

sectors depends on whether they were last protected or unprotected using the method described in “Sector

protection/unprotection”.

Accelerated Program Operation

The device offers accelerated program operations through the ACC function. This is one of two functions provided

by the WP/ACC pin. This function is primarily intended to allow faster factory throughput by 50 percent.

If the system asserts VHH on this pin, the device automatically enters the after mentioned Fast mode, temporarily

unprotects any protected sectors, and uses the higher voltage on the pin to reduce the time required for program

operations. The system would use a two-cycle program command sequence as required by the Fast mode.

Removing VHH from the WP/ACC pin returns the device to normal operation.

If you use this function, please contact a Fujitsu representative for more information.

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