MBM29F080A-70PF View Datasheet(PDF) - Fujitsu

Part Name

Description

Manufacturer

MBM29F080A-70PF

FLASH MEMORY CMOS 8M (1M ×8) BIT

Fujitsu 

To Top / Lineup / Index

MBM29F080A-55/-70/-90

Temporary Sector Group Unprotection

This feature allows temporary unprotection of previously protected sector groups of the MBM29F080A device

in order to change data. The Sector Group Unprotection mode is activated by setting the RESET pin to high

voltage (12 V). During this mode, formerly protected sector groups can be programmed or erased by selecting

the sector group addresses. Once the 12 V is taken away from the RESET pin, all the previously protected sector

groups will be protected again. Refer to Figures 14 and 21.

Table 6 MBM29F080A Command Definitions

Command

Sequence

Bus

Write

First Bus Second Bus Third Bus

Write Cycle Write Cycle Write Cycle

Fourth Bus

Read/Write

Cycle

Fifth Bus

Write

Cycle

Cycles

Req'd

Addr. Data

Addr.

Data

Addr.

Data

Addr.

Data Addr.

Dat

a

Sixth Bus

Write Cycle

Addr. Data

Read/Reset*

1 XXXH F0H — — — — — — — — — —

Reset/Read*

3 555H AAH 2AAH 55H 555H F0H RA RD — — — —

Manufacture Code 3 555H AAH 2AAH 55H 555H 90H 00H 04H — — — —

Device Code

3 555H AAH 2AAH 55H 555H 90H 01H 05H — — — —

Byte Program

4 555H AAH 2AAH 55H 555H A0H PA PD — — — —

Chip Erase

6 555H AAH 2AAH 55H 555H 80H 555H AAH 2AAH 55H 555H 10H

Sector Erase

6 555H AAH 2AAH 55H 555H 80H 555H AAH 2AAH 55H SA 30H

Sector Erase Suspend Erase can be suspended during sector erase with Addr (“H” or “L”), Data (B0H)

Sector Erase Resume Erase can be resumed after suspend with Addr (“H” or “L”), Data (30H)

Notes: 1. Address bits A11 to A19 = X = “H” or “L” for all address commands except or Program Address (PA) and

Sector Address (SA).

2. Bus operations are defined in Table 2.

3. RA = Address of the memory location to be read.

PA = Address of the memory location to be programmed. Addresses are latched on the falling edge of

the WE pulse.

SA = Address of the sector to be erased. The combination of A19, A18, A17, and A16 will uniquely select

any sector.

4. RD = Data read from location RA during read operation.

PD = Data to be programmed at location PA. Data is latched on the rising edge of WE.

5. Read and Byte program functions to non-erasing sectors are allowed in the Erase Suspend mode.

6. The system should generate the following address pattens: 555H or 2AAH to addresses A0 to A10.

*: Either of the two reset commands will reset the device.

Command Definitions

Device operations are selected by writing specific address and data sequences into the command register.

Writing incorrect address and data values or writing them in the improper sequence will reset the device to the

read mode. Table 6 defines the valid register command sequences. Note that the Erase Suspend (B0H) and

Erase Resume (30H) commands are valid only while the Sector Erase operation is in progress. Moreover, both

Read/Reset commands are functionally equivalent, resetting the device to the read mode.

13

Share Link: