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Tel: 408-235-8680

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Fax: 408-235-8685

10

EN29F800

Rev. E, Issue Date: 2001/07/05

COMMAND DEFINITIONS

The operations of the EN29F800 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. EN29F800 Command Definitions

Bus Cycles

1

st

Write Cycle

2

nd

Write Cycle

3

rd

Write Cycle

4

th

Write Cycle

5

th

Write Cycle

6

th

Write Cycle

Command

Sequence

Add

Data

Add

Data

Add

Data

Add

Data

Add

Data

Add

Data

Read

1

RA

RD

Reset

1

xxx

F0

Word

555

2AA

555

Manufacturer

ID

Byte

4

AAA

AA

555

55

AAA

90

000/

100

7F/

1C

Word

555

2AA

555

001/

101

7F/

2289

Device ID

Top Boot

Byte

4

AAA

AA

555

55

AAA

90

002/

102

7F/

89

Word

555

2AA

555

001/

101

7F/

228A

Device ID

Bottom Boot

Byte

4

AAA

AA

555

55

AAA

90

002/

102

7F/

8A

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

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 A18-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 operation in the Erase

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

The Reset command must be issued to re-enable the device for reading array data if DQ5 goes high, or while

in the autoselect mode. See next section for details on Reset.