This Data Sheet may be revised by subsequent versions

©2005 Eon Silicon Solution, Inc., www.essi.com.tw

or modifications due to changes in technical specifications.

11

EN29LV400A

COMMAND DEFINITIONS

The operations of the EN29LV400A 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. EN29LV400A Command Definitions

Bus Cycles

1

st

Cycle

2

nd

Cycle

3

rd

Cycle

4

th

Cycle

5

th

Cycle

6

th

Cycle

Command

Sequence

Addr

Data

Addr

Data

Addr

Data

Addr

Data

Addr

Data

Addr

Data

Read

1

RA

RD

Reset

1

xxx

F0

Word

555

2AA

555

100

1C

Manufacturer

ID

Byte

4

AAA

AA

555

55

AAA

90

200

1C

Word

555

2AA

555

X01

22B9

Device ID

Top Boot

Byte

4

AAA

AA

555

55

AAA

90

X02

B9

Word

555

2AA

555

X01

22BA

Device ID

Bottom Boot

Byte

4

AAA

AA

555

55

AAA

90

X02

BA

XX00

Word

555

2AA

555

(SA)

X02

XX01

00

Sector Protect

Verify

Byte

4

AAA

AA

555

55

AAA

90

(SA)

X04

01

Word

555

2AA

555

Program

Byte

4

AAA

AA

555

55

AAA

A0

PA

PD

Word

555

2AA

555

Unlock Bypass

Byte

3

AAA

AA

555

55

AAA

20

Unlock Bypass Program

2

XXX

A0

PA

PD

Unlock Bypass Reset

2

XXX

90

XXX

00

Word

555

2AA

555

555

2AA

555

Chip Erase

Byte

6

AAA

AA

555

55

AAA

80

AAA

AA

555

55

AAA

10

Word

555

2AA

555

555

2AA

Sector Erase

Byte

6

AAA

AA

555

55

AAA

80

AAA

AA

555

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 A17-A12 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

Rev. A, Issue Date: 2005/01/07