MBM29F017A-12 데이터 시트보기 (PDF) - Fujitsu

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MBM29F017A-12

FLASH MEMORY CMOS 16M (2M × 8) BIT

Fujitsu 

MBM29F017A-70/-90/-12

Temporary Sector Group Unprotection

This feature allows temporary unprotection of previously protected sector groups of the MBM29F017A 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 13 and 20.

Command

Sequence

Read/Reset*

Reset/Read*

Autoselect

Byte Program

Chip Erase

Sector Erase

Sector Erase

Suspend

Sector Erase

Resume

Table 6 MBM29F017A Command Definitions

Bus

Write

Cycles

Req'd

First Bus Second Bus

Write Cycle Write Cycle

Addr. Data Addr. Data

Third Bus

Write Cycle

Addr. Data

Fourth Bus

Read/Write

Cycle

Addr. Data

Fifth Bus

Write Cycle

Addr. Data

Sixth Bus

Write Cycle

Addr. Data

1 XXXH F0H — — — — — — — — — —

3 XXXH AAH XXXH 55H XXXH F0H RA RD — — — —

3 XXXH AAH XXXH 55H XXXH 90H — — — — — —

4 XXXH AAH XXXH 55H XXXH A0H PA PD — — — —

6 XXXH AAH XXXH 55H XXXH 80H XXXH AAH XXXH 55H XXXH 10H

6 XXXH AAH XXXH 55H XXXH 80H XXXH AAH XXXH 55H SA 30H

1 Erase can be suspended during sector erase with Addr (“H” or “L”). Data (B0H)

1 Erase can be resumed after suspend with Addr (“H” or “L”). Data (30H)

Notes: 1. Bus operations are defined in Table 2.

2. 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 A20, A19, A18, A17, and A16 will uniquely select

any sector.

3. 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.

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

* : 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.

14

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