M28W320ECT, M28W320ECB

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The lock status can be monitored for each block

using the Read Electronic Signature command.

Locked-Down blocks revert to the locked (and not

locked-down) state when the device is reset on

power-down. Table. 10 shows the protection sta-

tus after issuing a Block Lock-Down command.

Refer to the section, Block Locking, for a detailed

explanation.

Table 4. Commands

Note: 1. X = Don’t Care, RA=Read Address, RD=Read Data, SRD=Status Register Data, ID=Identifier (Manufacture and Device Code),

QA=Query Address, QD=Query Data, BA=Block Address, PA=Program Address, PD=Program Data, PRA=Protection Register Ad-

dress, PRD=Protection Register Data.

2. The signature addresses are listed in Tables 5, 6 and 7.

3. Program Addresses 1 and 2 must be consecutive Addresses differing only for A0.

4. Program Addresses 1,2,3 and 4 must be consecutive Addresses differing only for A0 and A1.

5. 55h is reserved.

6. To be characterized.

Commands

Bus Write Operations

1st Cycle

2nd Cycle

3rd Cycle

4th Cycle

5th Cycle

Op. Add Data

Op. Add Data

Op.

Add Data Op.

Add Data

Op. Add Data

Read Memory

Array

1+ Write

X

FFh

Read

RA

RD

Read Status

Register

1+ Write

X

70h

Read

X

SRD

Read Electronic

Signature

1+ Write

X

90h

IDh

Read CFI Query

1+ Write

X

98h

Read

QA

QD

Erase

2

Write

X

20h

Write

BA

D0h

Program

2

Write

X

40h

or

10h

Write

PA

PD

Double Word

3

Write

X

30h

Write

PA1

PD1

Write

PA2

PD2

Quadruple Word

5Write

X

PA1

PD1

Write

PA2

PD2

Write

PA3

PD3 Write

PA4

PD4

Clear Status

Register

1

Write

X

50h

Program/Erase

Suspend

1Write

X

B0h

Program/Erase

Resume

1Write

X

D0h

Block Lock

2

Write

X

60h

Write

BA

01h

Block Unlock

2

Write

X

60h

Write

BA

D0h

Block Lock-Down

2

Write

X

60h

Write

BA

2Fh

Protection

Register Program

2

Write

X

C0h

Write

PRA

PRD