MBM29LV017 Ver la hoja de datos (PDF) - Fujitsu

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Fabricante

MBM29LV017

CMOS 16M (2M × 8) BIT

Fujitsu 

MBM29LV017-80/-90/-12

Command

Sequence

Fast Mode Set

Fast Program *1

Fast Mode Reset*1

Query Command *2

Extended Sector

Protection*3

Table 6 MBM29LV017 Extended Command Definitions

Bus

Write

Cycles

Req'd

3

2

2

2

First Bus

Write Cycle

Addr Data

XXXH

XXXH

XXXH

XXH

AAH

A0H

90H

98H

Second Bus

Write Cycle

Addr Data

XXXH 55H

PA

PD

XXXH F0H *4

—

—

Third Bus

Write Cycle

Addr Data

XXXH 20H

—

—

—

—

—

—

4

XXXH 60H SPA 60H SPA 40H

Fourth Bus

Read Cycle

Addr Data

—

—

—

—

—

—

—

—

SPA SD

SPA: Sector address to be protected. Set sector address (SA) and (A10, A6, A1, A0) = (0, 0, 1, 0).

SD: Sector protection verify data. Output 01H at protected sector addresses and output 00H at unprotected

sector addresses.

*1: This command is valid while Fast Mode.

*2: Addresses from system set to A0 to A6. The other address are “DON’T CARES”.

*3: This command is valid while VID = RESET.

*4: The data “00H” is also acceptable.

Read/Reset Command

The read or reset operation is initiated by writing the Read/Reset command sequence into the command register.

Microprocessor read cycles retrieve array data from the memory. The device remains enabled for reads until the

command register contents are altered.

The devices will automatically power-up in the read/reset state. In this case, a command sequence is not required

to read data. Standard microprocessor read cycles will retrieve array data. This default value ensures that no

spurious alteration of the memory content occurs during the power transition. Refer to the AC Read

Characteristics and Waveforms for the specific timing parameters.(See Figures 5.1 and 5.2.)

Autoselect Command

Flash memories are intended for use in applications where the local CPU alters memory contents. As such,

manufacture and device codes must be accessible while the device resides in the target system. PROM

programmers typically access the signature codes by raising A9 to a high voltage. However, multiplexing high

voltage onto the address lines is not generally desired system design practice.

The device contains an Autoselect command operation to supplement traditional PROM programming

methodology. The operation is initiated by writing the Autoselect command sequence into the command register.

Following the command write, a read cycle from address XX00H retrieves the manufacture code of 04H. A read

cycle from address X001H returns the device code (MBM29LV017 = C8H). (See Tables 3.1 and 3.2.)

All manufacturer and device codes will exhibit odd parity with the MSB (DQ7) defined as the parity bit.

Sector state (protection or unprotection) will be informed address X0002H.

Scanning the sector addresses (A20, A19, A18, A17, A16) while (A10, A6, A1, A0) = (0, 0, 1, 0) will produce a logical

“1” at device output DQ0 for a protected sector. The programming verification should be perform margin mode

on the protected sector. (See Table 2.)

To terminate the operation, it is necessary to write the Read/Reset command sequence into the register, and

also to write the Autoselect command during the operation, execute it after writing Read/Reset command

sequence.

15

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