MOSEL VITELIC

V29LC51000

9

V29LC51000 Rev. 0.4 October 2000

Table 2. Command Codes

NOTES:

1.

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

2.

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

3.

40H: Manufacturing ID

4.

20H: Device ID

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(3)

01H

20H(4)

Byte

Program

5555H

AAH

2AAAH

55H

5555H

A0H

PA

PD(2)

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(1)

30H

Chip Erase Cycle

The V29LC51000 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 500ms later.

Hardware Data Protection

inhibited when VCC is less than 2.5V.

Noise Protection: a CE or WE pulse of less than

5ns will not initiate a program cycle.

Program Inhibit Protection: holding any one of

OE LOW, CE HIGH or WE HIGH inhibits a program

cycle.