Preliminary W45B012

- 4 -

Write Protect

The #WP pin provides inadvertent write protection. The #WP pin must be held high for any Erase or

Program operation. The #WP pin is "don't care" for all other operations. In typical use, the #WP pin is

may occur and the write protection feature is disabled. The #WP pin has an internal pull-up and could

remain unconnected when not used.

DEVICE OPERATION INSTRUCTION

BUS CYCLE

1

2

3

4

5

6

7

Operation/Type

Address

Address

Data

Dummy

Data

Read

FFh

X

X

Dout

20h

X

Dout

X

Chip-erase

60h

X

X

X

Dout

X

Byte-program

10h

Din

X

Software-status

9Fh

Dout

Read Manufacture ID

90h

X

X

DAh

90h

X

X

98h

Notes:

1. A23

− A17 are "Don't Care" for device.

2. A16

− A12 are used to determine sector address, A11 − A8 are don't care.

3. With A16

− A1 = 0, W45B010 Device ID = 98h, is read with A0 = 1.

DEVICE OPERATION TABLE

OPERATION

SI

SO

#WP

#RESET

Read

X

Dout

Low

X

High

Sector-erase

X

X

Low

High

High

Chip-erase

X

X

Low

High

High

Byte-program

Din

X

Low

High

High

Software-status

X

Dout

Low

X

High

Reset2

X

X

X

X

Low

Read Manufacture ID

X

Dout

Low

X

High

Read Device ID

X

Dout

Low

X

High

Notes:

1. A high to low transition on #CE will be required to start any device operation except for Reset.

2. The #RESET low will return the device to standby and terminate any Erase or Program operation in progress.