MB91155 datasheet(71/105 Pages) FUJITSU

71 / 105 page

MB91F155A/MB91155/MB91154

16. FLASH Memory

The MB91F155A contains a 510-Kbyte (4 Mbits) flash memory. The sectors can be erased all at once or sector

by sector and that can be written with the FR-CPU by half word (16 bits) using a single 0.3 V power supply.

The MB91F155 accomplishes the following functions by a combination of the flash memory macro and the FR-

CPU interface circuit :

• Functions as the CPU program/data storage memory :

When used as a ROM, the memory is accessible with a 32-bit bus width.

Allows the CPU to read from/write to/erase the memory (automatic program algorithm*) .

• Functions equivalent to the stand-alone MBM29LV400C flash memory product :

Allows a ROM programmer to read from/write to/erase the memory (automatic program algorithm*)

At this time, using the flash memory from the FR-CPU is described. For detailed information about using the

flash memory from the ROM programmer, refer to the ROM programmer instruction manual.

* : Automatic program algorithm

= Embedded AlgorithmTM

Embedded AlgorithmTM is a trademark of Advanced Micro Devices, Inc.

• Block Diagram

RDY/BUSY

Rising edge detection

Flash memory

Control signal

generation

RESET

BYTE

FA18 - 0

Address buffer

FR-C bus (instructions/data)

Data buffer

CA18 - 0

INTE

RDYINT

RDY

CD31 - 0

DI15 - 0

DO31 - 0

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