W28F641B/T

FIRST BUS CYCLE

SECOND BUS CYCLE

COMMAND

BUS

CYCLES

REQ’D.

NOTE

Data

Read Array

1

Write

PA

FFH

Read Identifier Codes/OTP

≥ 2

4

Write

PA

90H

Read

IA or OA ID or OD

Read Query

≥ 2

4

Write

PA

98H

Read

QA

QD

Read Status Register

2

Write

PA

70H

Read

PA

SRD

Clear Status Register

1

Write

PA

50H

Block Erase

2

5

Write

BA

20H

Write

BA

D0H

Full Chip Erase

2

5, 9

Write

X

30H

Write

X

D0H

Program

2

5, 6

Write

WA

40H or

10H

Write

WA

WD

Page Buffer Program

≥ 4

5, 7

Write

WA

E8H

Write

WA

N-1

Block Erase and (Page Buffer)

Program Suspend

1

8, 9

Write

PA

B0H

Block Erase and (Page Buffer)

Program Resume

1

8, 9

Write

PA

D0H

Set Block Lock Bit

2

Write

BA

60H

Write

BA

01H

Clear Block Lock Bit

2

10

Write

BA

60H

Write

BA

D0H

Set Block Lock-down Bit

2

Write

BA

60H

Write

BA

2FH

OTP Program

2

9

Write

OA

C0H

Write

OA

OD

Set Partition configuration

Register

2

Write

PCRC

60H

Write

PCRC

04H

Notes:

1. Bus operations are defined in Table 5.

2. All address which is written at the first bus cycle should be the same as the address which is written at the second bus cycle.

X = Any valid address within the device.

PA = Address within the selected partition.

IA = Identifier codes address (See Table 3 and Table 4).

QA = Query codes address. Refer to Appendix for details.

BA = Address within the block being erased, set/cleared block lock bit or set block lock-down bit.

WA = Address of memory location for the Program command or the first address for the Page Buffer Program command.

OA = Address of OTP block to be read or programmed (See Figure 3).

PCRC = Partition configuration register code presented on the address A0

− A15.

3. ID = Data read from identifier codes. (See Table 3 and Table 4).

QD = Data read from query database. Refer to Appendix for details.

SRD = Data read from status register. See Table 10 and Table 11 for a description of the status register bits.

WD = Data to be programmed at location WA. Data is latched on the rising edge of #WE or #CE (whichever goes high first)

during command write cycles.

OD = Data within OTP block. Data is latched on the rising edge of #WE or #CE (whichever goes high first) during command

write cycles.

N-1 = N is the number of the words to be loaded into a page buffer.

4. Following the Read Identifier Codes/OTP command, read operations access manufacturer code, device code, block lock

configuration code, partition configuration register code and the data within OTP block (See Table 3 and Table 4). The Read

Query command is available for reading CFI (Common Flash Interface) information.

5. Block erase, full chip erase or (page buffer) program cannot be executed when the selected block is locked. Unlocked block

6. Either 40H or 10H are recognized by the CUI (Command User Interface) as the program setup.

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