V29C51001B-90P datasheet(10/16 Pages) MOSEL

Part #	V29C51001B-90P

Description	1 MEGABIT 131,072 x 8 BIT 5 VOLT CMOS FLASH MEMORY

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Manufacturer	MOSEL [Mosel Vitelic, Corp]

Direct Link	http://www.moselvitelic.com

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MOSEL VITELIC

V29C51001T/V29C51001B

V29C51001T/V29C51001B Rev. 0.8 October 2000

Sector Erase Cycle

The V29C51001T/V29C51001B features a

sector erase operation which allows each sector to

be erased and reprogrammed without affecting

data stored in other sectors. Sector erase operation

is initiated by using a specific six-bus-cycle

sequence: Two unlock program cycles, a setup

command, two additional unlock program cycles,

and the sector erase command (see Table 2). A

sector must be first erased before it can be

reprogrammed. While in the internal erase mode,

the device ignores any program attempt into the

device. The internal erase completion can be

determined via DATA polling or toggle bit.

The V29C51001T/V29C51001B is shipped with

pre-erased sectors (all bits = 1).

Chip Erase Cycle

The V29C51001T/V29C51001B features a chip-

erase operation. The chip erase operation is

initiated by using a specific six-bus-cycle

sequence: two unlock program cycles, a setup

command, two additional unlock program cycles,

and the chip erase command (see Table 2).

The chip erase operation is performed

sequentially, one sector at a time. When the

automated on chip erase algorithm is requested

with the chip erase command sequence, the device

automatically programs and verifies the entire

memory array for an all zero pattern prior to erasure

The automatic erase begins on the rising edge of

the last WE or CE pulse in the command sequence

and terminates when the data on DQ7 is “1”.

Program Cycle Status Detection

There are two methods for determining the state

of the V29C51001T/V29C51001B during a

program (erase/program) cycle: DATA Polling

(I/O7) and Toggle Bit (I/O6).

DATA Polling (I/O7)

The V29C51001T/V29C51001B features DATA

polling to indicate the end of a program cycle.

When the device is in the program cycle, any

attempt to read the device will received the

complement of the loaded data on I/O7. Once the

program cycle is completed, I/O7 will show true

data, and the device is then ready for the next

cycle.

Toggle Bit (I/O6)

The V29C51001T/V29C51001B also features

another method for determining the end of a

program cycle. When the device is in the program

cycle, any attempt to read the device will result in

l/O6 toggling between 1 and 0. Once the program is

completed, the toggling will stop. The device is then

ready for the next operation. Examining the toggle

bit may begin at any time during a program cycle.

Table 2. Command Codes

NOTES:

1.

Top Boot Sector

2.

Bottom Boot Sector

3.

PA: The address of the memory location to be programmed.

4.

PD: The data at the byte address to be programmed.

Command

Sequence

First Bus

Program Cycle

Second Bus

Program Cycle

Third Bus

Program Cycle

Fourth Bus

Program Cycle

Fifth Bus

Program Cycle

Six Bus

Program Cycle

Address

Data

Address

Data

Address

Data

Address

Data

Address

Data

Address

Data

Read

XXXXH

F0H

Read

5555H

AAH

2AAAH

55H

5555H

F0H

RA

RD

Autoselect

5555H

AAH

2AAAH

55H

5555H

90H

00H

40H

01H

01H(1)

A1H(2)

Byte

Program

5555H

AAH

2AAAH

55H

5555H

A0H

PA

PD(4)

Chip Erase

5555H

AAH

2AAAH

55H

5555H

80H

5555H

AAH

2AAAH

55H

5555H

10H

Sector Erase

5555H

AAH

2AAAH

55H

5555H

80H

5555H

AAH

2AAAH

55H

PA(3)

30H

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V29C51001B-90P Datasheet(PDF) 10 Page - Mosel Vitelic, Corp

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