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.

8

EN29F002A / EN29F002AN

Rev. A, Issue Date: 2003/03/26

Table 5. EN29F002A Command Definitions

Command

Sequence

Read/Reset

Write

Cycles

Req’d

1

st

Write Cycle

2

nd

Write Cycle

3

rd

Write Cycle

4

th

Write Cycle

5

th

Write Cycle

6

th

Write Cycle

Addr

Data

Addr

Data

Addr

Data

Addr

Data

Addr

Data

Addr

Data

Read/Reset

1

XXXh F0h

RA

RD

Read/Reset

4

555h

AAh AAAh 55h

555h

F0h

RA

RD

AutoSelect

Manufacturer ID

4

555h

AAh AAAh 55h

555h

90h

000h/

100h

7Fh/

1Ch

AutoSelect Device ID

(Top Boot)

4

555h

AAh AAAh 55h

555h

90h

001h/

101h

7Fh/

92h

AutoSelect Device ID

(Bottom Boot)

4

555h

AAh AAAh 55h

555h

90h

001h/

101h

7Fh/

97h

AutoSelect Sector

Protect Verify

4

555h

AAh AAAh 55h

555h

90h

SA &

02h

00h/

01h

Byte Program

4

555h

AAh AAAh 55h

555h

A0h

PA

PD

Chip Erase

6

555h

AAh AAAh 55h

555h

80h

555h

AAh AAAh 55h

555h

10h

Sector Erase

6

555h

AAh AAAh 55h

555h

80h

555h

AAh AAAh 55h

SA

30h

Sector Erase Suspend

1

xxxh

B0h

Sector Erase Resume

1

xxxh

30h

Notes:

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

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

PA = Program Address: address of the memory location to be programmed

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

SA = Sector Address: address of the sector to be erased. Address bits A17-A13 uniquely select any sector.

The data is 00h for an unprotected sector and 01h for a protected sector.

Byte Programming Command

Programming the EN29F002A is performed on a byte-by-byte basis using a four bus-cycle operation

(two unlock write cycles followed by the Program Setup command and Program Data Write cycle).

When the program command is executed, no additional CPU controls or timings are necessary. The

program operation is terminated automatically by an internal timer. Address is latched on the falling

is first. The program operation is completed when EN29F002A returns the equivalent data to the

programmed location.

bit). Changing data from 0 to 1 requires an erase operation. When programming time limit is

exceeded, DQ5 will produce a logical “1” and a Reset command can return the device to Read

mode.

during Byte Programming, data at the programmed location may get corrupted. Programming is

allowed in any sequence and across any sector boundary.

Chip Erase Command

An auto Chip Erase algorithm is employed when the Chip Erase command sequence is performed.

Although the Chip Erase command requires six bus cycles: two unlock write cycles, a setup

command, two additional unlock write cycles and the chip erase command, the user does not need