5

P/N:PM0538

REV. 2.3, DEC. 10, 2004

MX29F040

First Bus

Second Bus

Third Bus

Fourth Bus

Fifth Bus

Sixth Bus

Command

Bus

Cycle

Cycle

Cycle

Cycle

Cycle

Cycle

Cycle

Addr

Data

Addr

Data

Addr

Data

Addr

Data

Addr

Data

Addr

Data

Reset

1

XXXH

F0H

Read

1

RA

RD

Read Silicon ID

4

555H

AAH

2AAH 55H

555H

90H

ADI

DDI

Sector Protect Verify

4

555H

AAH

2AAH 55H

555H

90H

(SA)X 00H

02

01H

Program

4

555H

AAH

2AAH 55H

555H

A0H

PA

PD

Chip Erase

6

555H

AAH

2AAH 55H

555H

80H

555H

AAH

2AAH 55H

555H 10H

Sector Erase

6

555H

AAH

2AAH 55H

555H

80H

555H

AAH

2AAH 55H

SA

30H

Sector Erase Suspend

1

XXXH

B0H

Sector Erase Resume

1

XXXH

30H

Unlock for sector

6

555H

AAH

2AAH 55H

555H

80H

555H

AAH

2AAH 55H

555H 20H

protect/unprotect

TABLE 1. SOFTWARE COMMAND DEFINITIONS

Note:

1. ADI = Address of Device identifier; A1=0, A0 = 0 for manufacture code,A1=0, A0 = 1 for device code A2-A18=Do

not care.

(Refer to table 3)

DDI = Data of Device identifier : C2H for manufacture code, A4H for device code.

X = X can be VIL or VIH

RA=Address of memory location to be read.

RD=Data to be read at location RA.

2. PA = Address of memory location to be programmed.

PD = Data to be programmed at location PA.

SA = Address to the sector to be erased.

3. The system should generate the following address patterns: 555H or 2AAH to Address A10~A0 .

Address bit A11~A18=X=Don't care for all address commands except for Program Address (PA) and Sector

Address (SA). Write Sequence may be initiated with A11~A18 in either state.

4. For Sector Protect Verify Operation : If read out data is 01H, it means the sector has been protected. If read out

data is 00H, it means the sector is still not being protected.

COMMAND DEFINITIONS

Device operations are selected by writing specific ad-

dress and data sequences into the command register.

Writing incorrect address and data values or writing them

in the improper sequence will reset the device to the

read mode. Table 1 defines the valid register command

sequences. Note that the Erase Suspend (B0H) and

Erase Resume (30H) commands are valid only while the

Sector Erase operation is in progress. Either of the two

reset command sequences will reset the device (when

applicable).