This Data Sheet may be revised by subsequent versions

©2003 Eon Silicon Solution, Inc., www.essi.com.tw

or modifications due to changes in technical specifications.

9

EN29LV512

Rev. B, Issue Date: 2004/01/05

COMMAND DEFINITIONS

The operations of the EN29LV512 are selected by one or more commands written into the

command register to perform Read/Reset Memory, Read ID, Read Sector Protection, Program,

Sector Erase, Chip Erase, Erase Suspend and Erase Resume. Commands are made up of data

sequences written at specific addresses via the command register.

The sequences for the

specified operation are defined in the Command Definitions table (Table 5). Incorrect addresses,

incorrect data values or improper sequences will reset the device to Read Mode.

Table 5. EN29LV512 Command Definitions

Bus Cycles

1

st

Cycle

2

nd

Cycle

3

rd

Cycle

4

th

Cycle

5

th

Cycle

6

th

Cycle

Command

Sequence

Add

Data

Add

Data

Add

Data

Add

Data

Add

Data

Add

Data

Read

1

RA

RD

Reset

1

Xxx

F0

Manufacturer ID

4

555

AA

2AA

55

555

90

100

1C

Device ID

4

555

AA

2AA

55

555

90

X01

6F

Sector Protect Verify

4

555

AA

2AA

55

555

90

(SA)

X02

00/

01

Program

4

555

AA

2AA

55

555

A0

PA

PD

Unlock Bypass

3

555

AA

2AA

55

555

20

Unlock Bypass Program

2

XXX

A0

PA

PD

Unlock Bypass Reset

2

XXX

90

XXX

00

Chip Erase

6

555

AA

2AA

55

555

80

555

AA

2AA

55

555

10

Sector Erase

6

555

AA

2AA

55

555

80

555

AA

2AA

55

SA

30

Erase Suspend

1

xxx

B0

Erase Resume

1

xxx

30

Address and Data values indicated in hex

RA = Read Address: address of the memory location to be read. This is a read cycle.

RD = Read Data: data read from location RA during Read operation. This is a read cycle.

PA = Program Address: address of the memory location to be programmed. X = Don’t-Care

PD = Program Data: data to be programmed at location PA

SA = Sector Address: address of the Sector to be erased or verified. Address bits A16-A14 uniquely select any Sector.

Reading Array Data

The device is automatically set to reading array data after power up. No commands are required to

retrieve data. The device is also ready to read array data after completing an Embedded Program or

Embedded Erase algorithm.

Following an Erase Suspend command, Erase Suspend mode is entered. The system can read array

data using the standard read timings, with the only difference in that if it reads at an address within erase

suspended sectors, the device outputs status data. After completing a programming operation in the

Erase Suspend mode, the system may once again read array data with the same exception.