V29C51000B-45T datasheet(10/16 Pages) MOSEL

Part #	V29C51000B-45T

Description	512K BIT 65,536 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

V29C51000T/V29C51000B

V29C51000T/V29C51000B Rev. 0.5 October 2000

the device ignores any program attempt into the

device. The internal erase completion can be

determined via DATA polling or toggle bit.

The V29C51000T/V29C51000B is shipped with

pre-erased sectors (all bits = 1).

Chip Erase Cycle

The V29C51000T/V29C51000B 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 V29C51000T/V29C51000B during a

program (erase/program) cycle: DATA Polling

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

DATA Polling (I/O7)

The V29C51000T/V29C51000B 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 V29C51000T/V29C51000B 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.

Boot Block Protection

The V29C51000T/V29C51000B features

hardware Boot Block Protection. This feature will

prevent erasing/programming of data in the Boot

Block once the feature is enabled (see Table 3).

The device is shipped with the Boot Block

unprotected.

Autoselect

The V29C51000T/V29C51000B features an

Autoselect mode to identify the Boot Block

(protected/unprotected), the Device (Top/Bottom),

and the manufacturer ID.

To get to the Autoselect mode, a high voltage

(VH) must be applied to the A9 pin. Once the A9

signal is returned to LOW or HIGH, the device will

return to the previous mode.

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

00H(1)

A0H(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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